Group rocksdb.sst.read.micros stat by different user read IOActivity + misc (#11444)

Summary:
**Context/Summary:**
- Similar to https://github.com/facebook/rocksdb/pull/11288 but for user read such as `Get(), MultiGet(), DBIterator::XXX(), Verify(File)Checksum()`.
   - For this, I refactored some user-facing `MultiGet` calls in `TransactionBase` and various types of `DB` so that it does not call a user-facing `Get()` but `GetImpl()` for passing the `ReadOptions::io_activity` check (see PR conversation)
   - New user read stats breakdown are guarded by `kExceptDetailedTimers` since measurement shows they have 4-5% regression to the upstream/main.

- Misc
   - More refactoring: with https://github.com/facebook/rocksdb/pull/11288, we complete passing `ReadOptions/IOOptions` to FS level. So we can now replace the previously [added](https://github.com/facebook/rocksdb/pull/9424) `rate_limiter_priority` parameter in `RandomAccessFileReader`'s `Read/MultiRead/Prefetch()` with `IOOptions::rate_limiter_priority`
   - Also, `ReadAsync()` call time is measured in `SST_READ_MICRO` now

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11444

Test Plan:
- CI fake db crash/stress test
- Microbenchmarking

**Build** `make clean && ROCKSDB_NO_FBCODE=1 DEBUG_LEVEL=0 make -jN db_basic_bench`
- google benchmark version: 604f6fd3f4
- db_basic_bench_base: upstream
- db_basic_bench_pr: db_basic_bench_base + this PR
- asyncread_db_basic_bench_base: upstream + [db basic bench patch for IteratorNext](https://github.com/facebook/rocksdb/compare/main...hx235:rocksdb:micro_bench_async_read)
- asyncread_db_basic_bench_pr: asyncread_db_basic_bench_base + this PR

**Test**

Get
```
TEST_TMPDIR=/dev/shm ./db_basic_bench_{null_stat|base|pr} --benchmark_filter=DBGet/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:1/negative_query:0/enable_filter:0/mmap:1/threads:1 --benchmark_repetitions=1000
```

Result
```
Coming soon
```

AsyncRead
```
TEST_TMPDIR=/dev/shm ./asyncread_db_basic_bench_{base|pr} --benchmark_filter=IteratorNext/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:1/async_io:1/include_detailed_timers:0 --benchmark_repetitions=1000 > syncread_db_basic_bench_{base|pr}.out
```

Result
```
Base:
1956,1956,1968,1977,1979,1986,1988,1988,1988,1990,1991,1991,1993,1993,1993,1993,1994,1996,1997,1997,1997,1998,1999,2001,2001,2002,2004,2007,2007,2008,

PR (2.3% regression, due to measuring `SST_READ_MICRO` that wasn't measured before):
1993,2014,2016,2022,2024,2027,2027,2028,2028,2030,2031,2031,2032,2032,2038,2039,2042,2044,2044,2047,2047,2047,2048,2049,2050,2052,2052,2052,2053,2053,
```

Reviewed By: ajkr

Differential Revision: D45918925

Pulled By: hx235

fbshipit-source-id: 58a54560d9ebeb3a59b6d807639692614dad058a

db/blob/blob_file_reader.cc

@@ -154,11 +154,9 @@ Status BlobFileReader::ReadHeader(const RandomAccessFileReader* file_reader,
     constexpr uint64_t read_offset = 0;
     constexpr size_t read_size = BlobLogHeader::kSize;
 
-    // TODO: rate limit reading headers from blob files.
     const Status s =
         ReadFromFile(file_reader, read_options, read_offset, read_size,
-                     statistics, &header_slice, &buf, &aligned_buf,
+                     statistics, &header_slice, &buf, &aligned_buf);
-                     Env::IO_TOTAL /* rate_limiter_priority */);
     if (!s.ok()) {
       return s;
     }
@@ -207,11 +205,9 @@ Status BlobFileReader::ReadFooter(const RandomAccessFileReader* file_reader,
     const uint64_t read_offset = file_size - BlobLogFooter::kSize;
     constexpr size_t read_size = BlobLogFooter::kSize;
 
-    // TODO: rate limit reading footers from blob files.
     const Status s =
         ReadFromFile(file_reader, read_options, read_offset, read_size,
-                     statistics, &footer_slice, &buf, &aligned_buf,
+                     statistics, &footer_slice, &buf, &aligned_buf);
-                     Env::IO_TOTAL /* rate_limiter_priority */);
     if (!s.ok()) {
       return s;
     }
@@ -242,8 +238,7 @@ Status BlobFileReader::ReadFromFile(const RandomAccessFileReader* file_reader,
                                     const ReadOptions& read_options,
                                     uint64_t read_offset, size_t read_size,
                                     Statistics* statistics, Slice* slice,
-                                    Buffer* buf, AlignedBuf* aligned_buf,
+                                    Buffer* buf, AlignedBuf* aligned_buf) {
-                                    Env::IOPriority rate_limiter_priority) {
   assert(slice);
   assert(buf);
   assert(aligned_buf);
@@ -264,13 +259,13 @@ Status BlobFileReader::ReadFromFile(const RandomAccessFileReader* file_reader,
     constexpr char* scratch = nullptr;
 
     s = file_reader->Read(io_options, read_offset, read_size, slice, scratch,
-                          aligned_buf, rate_limiter_priority);
+                          aligned_buf);
   } else {
     buf->reset(new char[read_size]);
     constexpr AlignedBuf* aligned_scratch = nullptr;
 
     s = file_reader->Read(io_options, read_offset, read_size, slice, buf->get(),
-                          aligned_scratch, rate_limiter_priority);
+                          aligned_scratch);
   }
 
   if (!s.ok()) {
@@ -345,8 +340,7 @@ Status BlobFileReader::GetBlob(
     }
     prefetched = prefetch_buffer->TryReadFromCache(
         io_options, file_reader_.get(), record_offset,
-        static_cast<size_t>(record_size), &record_slice, &s,
+        static_cast<size_t>(record_size), &record_slice, &s, for_compaction);
-        read_options.rate_limiter_priority, for_compaction);
     if (!s.ok()) {
       return s;
     }
@@ -357,10 +351,10 @@ Status BlobFileReader::GetBlob(
     PERF_COUNTER_ADD(blob_read_count, 1);
     PERF_COUNTER_ADD(blob_read_byte, record_size);
     PERF_TIMER_GUARD(blob_read_time);
-    const Status s = ReadFromFile(
+    const Status s =
-        file_reader_.get(), read_options, record_offset,
+        ReadFromFile(file_reader_.get(), read_options, record_offset,
-        static_cast<size_t>(record_size), statistics_, &record_slice, &buf,
+                     static_cast<size_t>(record_size), statistics_,
-        &aligned_buf, read_options.rate_limiter_priority);
+                     &record_slice, &buf, &aligned_buf);
     if (!s.ok()) {
       return s;
     }
@@ -468,9 +462,12 @@ void BlobFileReader::MultiGetBlob(
   TEST_SYNC_POINT("BlobFileReader::MultiGetBlob:ReadFromFile");
   PERF_COUNTER_ADD(blob_read_count, num_blobs);
   PERF_COUNTER_ADD(blob_read_byte, total_len);
-  s = file_reader_->MultiRead(IOOptions(), read_reqs.data(), read_reqs.size(),
+  IOOptions opts;
-                              direct_io ? &aligned_buf : nullptr,
+  s = file_reader_->PrepareIOOptions(read_options, opts);
-                              read_options.rate_limiter_priority);
+  if (s.ok()) {
+    s = file_reader_->MultiRead(opts, read_reqs.data(), read_reqs.size(),
+                                direct_io ? &aligned_buf : nullptr);
+  }
   if (!s.ok()) {
     for (auto& req : read_reqs) {
       req.status.PermitUncheckedError();

db/blob/blob_file_reader.h

@@ -89,8 +89,7 @@ class BlobFileReader {
                              const ReadOptions& read_options,
                              uint64_t read_offset, size_t read_size,
                              Statistics* statistics, Slice* slice, Buffer* buf,
-                             AlignedBuf* aligned_buf,
+                             AlignedBuf* aligned_buf);
-                             Env::IOPriority rate_limiter_priority);
 
   static Status VerifyBlob(const Slice& record_slice, const Slice& user_key,
                            uint64_t value_size);

db/blob/blob_log_sequential_reader.cc

@@ -29,9 +29,8 @@ Status BlobLogSequentialReader::ReadSlice(uint64_t size, Slice* slice,
 
   StopWatch read_sw(clock_, statistics_, BLOB_DB_BLOB_FILE_READ_MICROS);
   // TODO: rate limit `BlobLogSequentialReader` reads (it appears unused?)
-  Status s =
+  Status s = file_->Read(IOOptions(), next_byte_, static_cast<size_t>(size),
-      file_->Read(IOOptions(), next_byte_, static_cast<size_t>(size), slice,
+                         slice, buf, nullptr);
-                  buf, nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
   next_byte_ += size;
   if (!s.ok()) {
     return s;

db/convenience.cc

@@ -7,6 +7,7 @@
 
 #include "rocksdb/convenience.h"
 
+#include "db/convenience_impl.h"
 #include "db/db_impl/db_impl.h"
 #include "util/cast_util.h"
 
@@ -39,9 +40,25 @@ Status VerifySstFileChecksum(const Options& options,
 }
 Status VerifySstFileChecksum(const Options& options,
                              const EnvOptions& env_options,
-                             const ReadOptions& read_options,
+                             const ReadOptions& _read_options,
                              const std::string& file_path,
                              const SequenceNumber& largest_seqno) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown) {
+    return Status::InvalidArgument(
+        "Can only call VerifySstFileChecksum with `ReadOptions::io_activity` "
+        "is "
+        "`Env::IOActivity::kUnknown`");
+  }
+  ReadOptions read_options(_read_options);
+  return VerifySstFileChecksumInternal(options, env_options, read_options,
+                                       file_path, largest_seqno);
+}
+
+Status VerifySstFileChecksumInternal(const Options& options,
+                                     const EnvOptions& env_options,
+                                     const ReadOptions& read_options,
+                                     const std::string& file_path,
+                                     const SequenceNumber& largest_seqno) {
   std::unique_ptr<FSRandomAccessFile> file;
   uint64_t file_size;
   InternalKeyComparator internal_comparator(options.comparator);
@@ -68,8 +85,8 @@ Status VerifySstFileChecksum(const Options& options,
       !kImmortal, false /* force_direct_prefetch */, -1 /* level */);
   reader_options.largest_seqno = largest_seqno;
   s = ioptions.table_factory->NewTableReader(
-      reader_options, std::move(file_reader), file_size, &table_reader,
+      read_options, reader_options, std::move(file_reader), file_size,
-      false /* prefetch_index_and_filter_in_cache */);
+      &table_reader, false /* prefetch_index_and_filter_in_cache */);
   if (!s.ok()) {
     return s;
   }

db/convenience_impl.h

@@ -0,0 +1,15 @@
+// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+#include "rocksdb/db.h"
+
+namespace ROCKSDB_NAMESPACE {
+Status VerifySstFileChecksumInternal(const Options& options,
+                                     const EnvOptions& env_options,
+                                     const ReadOptions& read_options,
+                                     const std::string& file_path,
+                                     const SequenceNumber& largest_seqno = 0);
+}  // namespace ROCKSDB_NAMESPACE

db/db_impl/compacted_db_impl.cc

@@ -43,18 +43,25 @@ Status CompactedDBImpl::Get(const ReadOptions& options, ColumnFamilyHandle*,
              /*timestamp*/ nullptr);
 }
 
-Status CompactedDBImpl::Get(const ReadOptions& options, ColumnFamilyHandle*,
+Status CompactedDBImpl::Get(const ReadOptions& _read_options,
-                            const Slice& key, PinnableSlice* value,
+                            ColumnFamilyHandle*, const Slice& key,
-                            std::string* timestamp) {
+                            PinnableSlice* value, std::string* timestamp) {
-  if (options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
     return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
+        "Can only call Get with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`");
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
   }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+
   assert(user_comparator_);
-  if (options.timestamp) {
+  if (read_options.timestamp) {
-    const Status s = FailIfTsMismatchCf(
+    const Status s =
-        DefaultColumnFamily(), *(options.timestamp), /*ts_for_read=*/true);
+        FailIfTsMismatchCf(DefaultColumnFamily(), *(read_options.timestamp),
+                           /*ts_for_read=*/true);
     if (!s.ok()) {
       return s;
     }
@@ -74,7 +81,7 @@ Status CompactedDBImpl::Get(const ReadOptions& options, ColumnFamilyHandle*,
   GetWithTimestampReadCallback read_cb(kMaxSequenceNumber);
   std::string* ts =
       user_comparator_->timestamp_size() > 0 ? timestamp : nullptr;
-  LookupKey lkey(key, kMaxSequenceNumber, options.timestamp);
+  LookupKey lkey(key, kMaxSequenceNumber, read_options.timestamp);
   GetContext get_context(user_comparator_, nullptr, nullptr, nullptr,
                          GetContext::kNotFound, lkey.user_key(), value,
                          /*columns=*/nullptr, ts, nullptr, nullptr, true,
@@ -88,8 +95,8 @@ Status CompactedDBImpl::Get(const ReadOptions& options, ColumnFamilyHandle*,
           /*b_has_ts=*/false) < 0) {
     return Status::NotFound();
   }
-  Status s = f.fd.table_reader->Get(options, lkey.internal_key(), &get_context,
+  Status s = f.fd.table_reader->Get(read_options, lkey.internal_key(),
-                                    nullptr);
+                                    &get_context, nullptr);
   if (!s.ok() && !s.IsNotFound()) {
     return s;
   }
@@ -106,15 +113,28 @@ std::vector<Status> CompactedDBImpl::MultiGet(
 }
 
 std::vector<Status> CompactedDBImpl::MultiGet(
-    const ReadOptions& options, const std::vector<ColumnFamilyHandle*>&,
+    const ReadOptions& _read_options, const std::vector<ColumnFamilyHandle*>&,
     const std::vector<Slice>& keys, std::vector<std::string>* values,
     std::vector<std::string>* timestamps) {
   assert(user_comparator_);
   size_t num_keys = keys.size();
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+    return std::vector<Status>(num_keys, s);
+  }
 
-  if (options.timestamp) {
+  ReadOptions read_options(_read_options);
-    Status s = FailIfTsMismatchCf(DefaultColumnFamily(), *(options.timestamp),
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
-                                  /*ts_for_read=*/true);
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
+
+  if (read_options.timestamp) {
+    Status s =
+        FailIfTsMismatchCf(DefaultColumnFamily(), *(read_options.timestamp),
+                           /*ts_for_read=*/true);
     if (!s.ok()) {
       return std::vector<Status>(num_keys, s);
     }
@@ -136,7 +156,7 @@ std::vector<Status> CompactedDBImpl::MultiGet(
   GetWithTimestampReadCallback read_cb(kMaxSequenceNumber);
   autovector<TableReader*, 16> reader_list;
   for (const auto& key : keys) {
-    LookupKey lkey(key, kMaxSequenceNumber, options.timestamp);
+    LookupKey lkey(key, kMaxSequenceNumber, read_options.timestamp);
     const FdWithKeyRange& f = files_.files[FindFile(lkey.user_key())];
     if (user_comparator_->CompareWithoutTimestamp(
             key, /*a_has_ts=*/false,
@@ -159,14 +179,15 @@ std::vector<Status> CompactedDBImpl::MultiGet(
     if (r != nullptr) {
       PinnableSlice pinnable_val;
       std::string& value = (*values)[idx];
-      LookupKey lkey(keys[idx], kMaxSequenceNumber, options.timestamp);
+      LookupKey lkey(keys[idx], kMaxSequenceNumber, read_options.timestamp);
       std::string* timestamp = timestamps ? &(*timestamps)[idx] : nullptr;
       GetContext get_context(
           user_comparator_, nullptr, nullptr, nullptr, GetContext::kNotFound,
           lkey.user_key(), &pinnable_val, /*columns=*/nullptr,
           user_comparator_->timestamp_size() > 0 ? timestamp : nullptr, nullptr,
           nullptr, true, nullptr, nullptr, nullptr, nullptr, &read_cb);
-      Status s = r->Get(options, lkey.internal_key(), &get_context, nullptr);
+      Status s =
+          r->Get(read_options, lkey.internal_key(), &get_context, nullptr);
       assert(static_cast<size_t>(idx) < statuses.size());
       if (!s.ok() && !s.IsNotFound()) {
         statuses[idx] = s;

db/db_impl/compacted_db_impl.h

@@ -30,9 +30,9 @@ class CompactedDBImpl : public DBImpl {
                      ColumnFamilyHandle* column_family, const Slice& key,
                      PinnableSlice* value) override;
 
-  Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
+  Status Get(const ReadOptions& _read_options,
-             const Slice& key, PinnableSlice* value,
+             ColumnFamilyHandle* column_family, const Slice& key,
-             std::string* timestamp) override;
+             PinnableSlice* value, std::string* timestamp) override;
 
   using DB::MultiGet;
   // Note that CompactedDBImpl::MultiGet is not the optimized version of
@@ -43,7 +43,7 @@ class CompactedDBImpl : public DBImpl {
       const std::vector<Slice>& keys,
       std::vector<std::string>* values) override;
 
-  std::vector<Status> MultiGet(const ReadOptions& options,
+  std::vector<Status> MultiGet(const ReadOptions& _read_options,
                                const std::vector<ColumnFamilyHandle*>&,
                                const std::vector<Slice>& keys,
                                std::vector<std::string>* values,

db/db_impl/db_impl.cc

@@ -28,6 +28,7 @@
 #include "db/arena_wrapped_db_iter.h"
 #include "db/builder.h"
 #include "db/compaction/compaction_job.h"
+#include "db/convenience_impl.h"
 #include "db/db_info_dumper.h"
 #include "db/db_iter.h"
 #include "db/dbformat.h"
@@ -74,7 +75,6 @@
 #include "port/port.h"
 #include "rocksdb/cache.h"
 #include "rocksdb/compaction_filter.h"
-#include "rocksdb/convenience.h"
 #include "rocksdb/db.h"
 #include "rocksdb/env.h"
 #include "rocksdb/merge_operator.h"
@@ -1922,15 +1922,43 @@ Status DBImpl::Get(const ReadOptions& read_options,
   return Get(read_options, column_family, key, value, /*timestamp=*/nullptr);
 }
 
-Status DBImpl::Get(const ReadOptions& read_options,
+Status DBImpl::GetImpl(const ReadOptions& read_options,
+                       ColumnFamilyHandle* column_family, const Slice& key,
+                       PinnableSlice* value) {
+  return GetImpl(read_options, column_family, key, value,
+                 /*timestamp=*/nullptr);
+}
+
+Status DBImpl::Get(const ReadOptions& _read_options,
                    ColumnFamilyHandle* column_family, const Slice& key,
                    PinnableSlice* value, std::string* timestamp) {
   assert(value != nullptr);
   value->Reset();
+
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
+    return Status::InvalidArgument(
+        "Can only call Get with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
+  }
+
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+
+  Status s = GetImpl(read_options, column_family, key, value, timestamp);
+  return s;
+}
+
+Status DBImpl::GetImpl(const ReadOptions& read_options,
+                       ColumnFamilyHandle* column_family, const Slice& key,
+                       PinnableSlice* value, std::string* timestamp) {
   GetImplOptions get_impl_options;
   get_impl_options.column_family = column_family;
   get_impl_options.value = value;
   get_impl_options.timestamp = timestamp;
+
   Status s = GetImpl(read_options, key, get_impl_options);
   return s;
 }
@@ -1999,11 +2027,6 @@ Status DBImpl::GetImpl(const ReadOptions& read_options, const Slice& key,
 
   assert(get_impl_options.column_family);
 
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`");
-  }
 
   if (read_options.timestamp) {
     const Status s = FailIfTsMismatchCf(get_impl_options.column_family,
@@ -2297,7 +2320,7 @@ std::vector<Status> DBImpl::MultiGet(
 }
 
 std::vector<Status> DBImpl::MultiGet(
-    const ReadOptions& read_options,
+    const ReadOptions& _read_options,
     const std::vector<ColumnFamilyHandle*>& column_family,
     const std::vector<Slice>& keys, std::vector<std::string>* values,
     std::vector<std::string>* timestamps) {
@@ -2309,12 +2332,30 @@ std::vector<Status> DBImpl::MultiGet(
   assert(column_family.size() == num_keys);
   std::vector<Status> stat_list(num_keys);
 
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+
+    for (size_t i = 0; i < num_keys; ++i) {
+      stat_list[i] = s;
+    }
+    return stat_list;
+  }
+
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
+
   bool should_fail = false;
   for (size_t i = 0; i < num_keys; ++i) {
     assert(column_family[i]);
     if (read_options.timestamp) {
-      stat_list[i] = FailIfTsMismatchCf(
+      stat_list[i] =
-          column_family[i], *(read_options.timestamp), /*ts_for_read=*/true);
+          FailIfTsMismatchCf(column_family[i], *(read_options.timestamp),
+                             /*ts_for_read=*/true);
       if (!stat_list[i].ok()) {
         should_fail = true;
       }
@@ -2627,10 +2668,26 @@ void DBImpl::MultiGet(const ReadOptions& read_options, const size_t num_keys,
            /* timestamps */ nullptr, statuses, sorted_input);
 }
 
-void DBImpl::MultiGet(const ReadOptions& read_options, const size_t num_keys,
+void DBImpl::MultiGet(const ReadOptions& _read_options, const size_t num_keys,
                       ColumnFamilyHandle** column_families, const Slice* keys,
                       PinnableSlice* values, std::string* timestamps,
                       Status* statuses, const bool sorted_input) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+    for (size_t i = 0; i < num_keys; ++i) {
+      if (statuses[i].ok()) {
+        statuses[i] = s;
+      }
+    }
+    return;
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
   MultiGetCommon(read_options, num_keys, column_families, keys, values,
                  /* columns */ nullptr, timestamps, statuses, sorted_input);
 }
@@ -2645,7 +2702,6 @@ void DBImpl::MultiGetCommon(const ReadOptions& read_options,
   if (num_keys == 0) {
     return;
   }
-
   bool should_fail = false;
   for (size_t i = 0; i < num_keys; ++i) {
     ColumnFamilyHandle* cfh = column_families[i];
@@ -2828,11 +2884,28 @@ void DBImpl::MultiGet(const ReadOptions& read_options,
            /* timestamps */ nullptr, statuses, sorted_input);
 }
 
-void DBImpl::MultiGet(const ReadOptions& read_options,
+void DBImpl::MultiGet(const ReadOptions& _read_options,
                       ColumnFamilyHandle* column_family, const size_t num_keys,
                       const Slice* keys, PinnableSlice* values,
                       std::string* timestamps, Status* statuses,
                       const bool sorted_input) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+    for (size_t i = 0; i < num_keys; ++i) {
+      if (statuses[i].ok()) {
+        statuses[i] = s;
+      }
+    }
+    return;
+  }
+
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
   MultiGetCommon(read_options, column_family, num_keys, keys, values,
                  /* columns */ nullptr, timestamps, statuses, sorted_input);
 }
@@ -2881,9 +2954,20 @@ void DBImpl::MultiGetCommon(const ReadOptions& read_options,
 }
 
 void DBImpl::MultiGetWithCallback(
-    const ReadOptions& read_options, ColumnFamilyHandle* column_family,
+    const ReadOptions& _read_options, ColumnFamilyHandle* column_family,
     ReadCallback* callback,
     autovector<KeyContext*, MultiGetContext::MAX_BATCH_SIZE>* sorted_keys) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    assert(false);
+    return;
+  }
+
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
+
   std::array<MultiGetColumnFamilyData, 1> multiget_cf_data;
   multiget_cf_data[0] = MultiGetColumnFamilyData(column_family, nullptr);
   std::function<MultiGetColumnFamilyData*(
@@ -2954,11 +3038,6 @@ Status DBImpl::MultiGetImpl(
     autovector<KeyContext*, MultiGetContext::MAX_BATCH_SIZE>* sorted_keys,
     SuperVersion* super_version, SequenceNumber snapshot,
     ReadCallback* callback) {
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return Status::InvalidArgument(
-        "Cannot call MultiGet with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`");
-  }
   PERF_CPU_TIMER_GUARD(get_cpu_nanos, immutable_db_options_.clock);
   StopWatch sw(immutable_db_options_.clock, stats_, DB_MULTIGET);
 
@@ -3383,8 +3462,19 @@ bool DBImpl::KeyMayExist(const ReadOptions& read_options,
   return s.ok() || s.IsIncomplete();
 }
 
-Iterator* DBImpl::NewIterator(const ReadOptions& read_options,
+Iterator* DBImpl::NewIterator(const ReadOptions& _read_options,
                               ColumnFamilyHandle* column_family) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
+    return NewErrorIterator(Status::InvalidArgument(
+        "Can only call NewIterator with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`"));
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
+  }
+
   if (read_options.managed) {
     return NewErrorIterator(
         Status::NotSupported("Managed iterator is not supported anymore."));
@@ -3394,17 +3484,12 @@ Iterator* DBImpl::NewIterator(const ReadOptions& read_options,
     return NewErrorIterator(Status::NotSupported(
         "ReadTier::kPersistedData is not yet supported in iterators."));
   }
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return NewErrorIterator(Status::InvalidArgument(
-        "Cannot call NewIterator with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`"));
-  }
-
   assert(column_family);
 
   if (read_options.timestamp) {
-    const Status s = FailIfTsMismatchCf(
+    const Status s =
-        column_family, *(read_options.timestamp), /*ts_for_read=*/true);
+        FailIfTsMismatchCf(column_family, *(read_options.timestamp),
+                           /*ts_for_read=*/true);
     if (!s.ok()) {
       return NewErrorIterator(s);
     }
@@ -3524,9 +3609,19 @@ ArenaWrappedDBIter* DBImpl::NewIteratorImpl(const ReadOptions& read_options,
 }
 
 Status DBImpl::NewIterators(
-    const ReadOptions& read_options,
+    const ReadOptions& _read_options,
     const std::vector<ColumnFamilyHandle*>& column_families,
     std::vector<Iterator*>* iterators) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
+    return Status::InvalidArgument(
+        "Can only call NewIterators with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
+  }
   if (read_options.managed) {
     return Status::NotSupported("Managed iterator is not supported anymore.");
   }
@@ -3534,11 +3629,6 @@ Status DBImpl::NewIterators(
     return Status::NotSupported(
         "ReadTier::kPersistedData is not yet supported in iterators.");
   }
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return Status::InvalidArgument(
-        "Cannot call NewIterators with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`");
-  }
 
   if (read_options.timestamp) {
     for (auto* cf : column_families) {
@@ -5793,12 +5883,35 @@ Status DBImpl::ClipColumnFamily(ColumnFamilyHandle* column_family,
   return status;
 }
 
-Status DBImpl::VerifyFileChecksums(const ReadOptions& read_options) {
+Status DBImpl::VerifyFileChecksums(const ReadOptions& _read_options) {
-  return VerifyChecksumInternal(read_options, /*use_file_checksum=*/true);
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kVerifyFileChecksums) {
+    return Status::InvalidArgument(
+        "Can only call VerifyFileChecksums with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or "
+        "`Env::IOActivity::kVerifyFileChecksums`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kVerifyFileChecksums;
+  }
+  return VerifyChecksumInternal(read_options,
+                                /*use_file_checksum=*/true);
 }
 
-Status DBImpl::VerifyChecksum(const ReadOptions& read_options) {
+Status DBImpl::VerifyChecksum(const ReadOptions& _read_options) {
-  return VerifyChecksumInternal(read_options, /*use_file_checksum=*/false);
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kVerifyDBChecksum) {
+    return Status::InvalidArgument(
+        "Can only call VerifyChecksum with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kVerifyDBChecksum`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kVerifyDBChecksum;
+  }
+  return VerifyChecksumInternal(read_options,
+                                /*use_file_checksum=*/false);
 }
 
 Status DBImpl::VerifyChecksumInternal(const ReadOptions& read_options,
@@ -5810,12 +5923,6 @@ Status DBImpl::VerifyChecksumInternal(const ReadOptions& read_options,
 
   Status s;
 
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    s = Status::InvalidArgument(
-        "Cannot verify file checksum with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`");
-    return s;
-  }
   if (use_file_checksum) {
     FileChecksumGenFactory* const file_checksum_gen_factory =
         immutable_db_options_.file_checksum_gen_factory.get();
@@ -5867,7 +5974,7 @@ Status DBImpl::VerifyChecksumInternal(const ReadOptions& read_options,
                                      fmeta->file_checksum_func_name, fname,
                                      read_options);
         } else {
-          s = ROCKSDB_NAMESPACE::VerifySstFileChecksum(
+          s = ROCKSDB_NAMESPACE::VerifySstFileChecksumInternal(
               opts, file_options_, read_options, fname, fd.largest_seqno);
         }
         RecordTick(stats_, VERIFY_CHECKSUM_READ_BYTES,
@@ -5930,12 +6037,6 @@ Status DBImpl::VerifyFullFileChecksum(const std::string& file_checksum_expected,
                                       const std::string& func_name_expected,
                                       const std::string& fname,
                                       const ReadOptions& read_options) {
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return Status::InvalidArgument(
-        "Cannot call VerifyChecksum with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`");
-  }
-
   Status s;
   if (file_checksum_expected == kUnknownFileChecksum) {
     return s;
@@ -5946,8 +6047,7 @@ Status DBImpl::VerifyFullFileChecksum(const std::string& file_checksum_expected,
       fs_.get(), fname, immutable_db_options_.file_checksum_gen_factory.get(),
       func_name_expected, &file_checksum, &func_name,
       read_options.readahead_size, immutable_db_options_.allow_mmap_reads,
-      io_tracer_, immutable_db_options_.rate_limiter.get(),
+      io_tracer_, immutable_db_options_.rate_limiter.get(), read_options);
-      read_options.rate_limiter_priority);
   if (s.ok()) {
     assert(func_name_expected == func_name);
     if (file_checksum != file_checksum_expected) {

db/db_impl/db_impl.h

@@ -234,7 +234,7 @@ class DBImpl : public DB {
   virtual Status Get(const ReadOptions& options,
                      ColumnFamilyHandle* column_family, const Slice& key,
                      PinnableSlice* value) override;
-  virtual Status Get(const ReadOptions& options,
+  virtual Status Get(const ReadOptions& _read_options,
                      ColumnFamilyHandle* column_family, const Slice& key,
                      PinnableSlice* value, std::string* timestamp) override;
 
@@ -265,7 +265,7 @@ class DBImpl : public DB {
       const std::vector<Slice>& keys,
       std::vector<std::string>* values) override;
   virtual std::vector<Status> MultiGet(
-      const ReadOptions& options,
+      const ReadOptions& _read_options,
       const std::vector<ColumnFamilyHandle*>& column_family,
       const std::vector<Slice>& keys, std::vector<std::string>* values,
       std::vector<std::string>* timestamps) override;
@@ -280,8 +280,9 @@ class DBImpl : public DB {
   void MultiGet(const ReadOptions& options, ColumnFamilyHandle* column_family,
                 const size_t num_keys, const Slice* keys, PinnableSlice* values,
                 Status* statuses, const bool sorted_input = false) override;
-  void MultiGet(const ReadOptions& options, ColumnFamilyHandle* column_family,
+  void MultiGet(const ReadOptions& _read_options,
-                const size_t num_keys, const Slice* keys, PinnableSlice* values,
+                ColumnFamilyHandle* column_family, const size_t num_keys,
+                const Slice* keys, PinnableSlice* values,
                 std::string* timestamps, Status* statuses,
                 const bool sorted_input = false) override;
 
@@ -289,13 +290,13 @@ class DBImpl : public DB {
                 ColumnFamilyHandle** column_families, const Slice* keys,
                 PinnableSlice* values, Status* statuses,
                 const bool sorted_input = false) override;
-  void MultiGet(const ReadOptions& options, const size_t num_keys,
+  void MultiGet(const ReadOptions& _read_options, const size_t num_keys,
                 ColumnFamilyHandle** column_families, const Slice* keys,
                 PinnableSlice* values, std::string* timestamps,
                 Status* statuses, const bool sorted_input = false) override;
 
   void MultiGetWithCallback(
-      const ReadOptions& options, ColumnFamilyHandle* column_family,
+      const ReadOptions& _read_options, ColumnFamilyHandle* column_family,
       ReadCallback* callback,
       autovector<KeyContext*, MultiGetContext::MAX_BATCH_SIZE>* sorted_keys);
 
@@ -336,10 +337,10 @@ class DBImpl : public DB {
                            bool* value_found = nullptr) override;
 
   using DB::NewIterator;
-  virtual Iterator* NewIterator(const ReadOptions& options,
+  virtual Iterator* NewIterator(const ReadOptions& _read_options,
                                 ColumnFamilyHandle* column_family) override;
   virtual Status NewIterators(
-      const ReadOptions& options,
+      const ReadOptions& _read_options,
       const std::vector<ColumnFamilyHandle*>& column_families,
       std::vector<Iterator*>* iterators) override;
 
@@ -627,6 +628,14 @@ class DBImpl : public DB {
     int* number_of_operands = nullptr;
   };
 
+  Status GetImpl(const ReadOptions& read_options,
+                 ColumnFamilyHandle* column_family, const Slice& key,
+                 PinnableSlice* value);
+
+  Status GetImpl(const ReadOptions& read_options,
+                 ColumnFamilyHandle* column_family, const Slice& key,
+                 PinnableSlice* value, std::string* timestamp);
+
   // Function that Get and KeyMayExist call with no_io true or false
   // Note: 'value_found' from KeyMayExist propagates here
   // This function is also called by GetMergeOperands

db/db_impl/db_impl_readonly.cc

@@ -36,14 +36,19 @@ Status DBImplReadOnly::Get(const ReadOptions& read_options,
              /*timestamp*/ nullptr);
 }
 
-Status DBImplReadOnly::Get(const ReadOptions& read_options,
+Status DBImplReadOnly::Get(const ReadOptions& _read_options,
                            ColumnFamilyHandle* column_family, const Slice& key,
                            PinnableSlice* pinnable_val,
                            std::string* timestamp) {
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
     return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
+        "Can only call Get with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`");
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
   }
   assert(pinnable_val != nullptr);
   PERF_CPU_TIMER_GUARD(get_cpu_nanos, immutable_db_options_.clock);
@@ -52,8 +57,9 @@ Status DBImplReadOnly::Get(const ReadOptions& read_options,
 
   assert(column_family);
   if (read_options.timestamp) {
-    const Status s = FailIfTsMismatchCf(
+    const Status s =
-        column_family, *(read_options.timestamp), /*ts_for_read=*/true);
+        FailIfTsMismatchCf(column_family, *(read_options.timestamp),
+                           /*ts_for_read=*/true);
     if (!s.ok()) {
       return s;
     }
@@ -116,17 +122,23 @@ Status DBImplReadOnly::Get(const ReadOptions& read_options,
   return s;
 }
 
-Iterator* DBImplReadOnly::NewIterator(const ReadOptions& read_options,
+Iterator* DBImplReadOnly::NewIterator(const ReadOptions& _read_options,
                                       ColumnFamilyHandle* column_family) {
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
     return NewErrorIterator(Status::InvalidArgument(
-        "Cannot call NewIterator with `ReadOptions::io_activity` != "
+        "Can only call NewIterator with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`"));
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`"));
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
   }
   assert(column_family);
   if (read_options.timestamp) {
-    const Status s = FailIfTsMismatchCf(
+    const Status s =
-        column_family, *(read_options.timestamp), /*ts_for_read=*/true);
+        FailIfTsMismatchCf(column_family, *(read_options.timestamp),
+                           /*ts_for_read=*/true);
     if (!s.ok()) {
       return NewErrorIterator(s);
     }

db/db_impl/db_impl_readonly.h

@@ -28,14 +28,14 @@ class DBImplReadOnly : public DBImpl {
   virtual Status Get(const ReadOptions& options,
                      ColumnFamilyHandle* column_family, const Slice& key,
                      PinnableSlice* value) override;
-  Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
+  Status Get(const ReadOptions& _read_options,
-             const Slice& key, PinnableSlice* value,
+             ColumnFamilyHandle* column_family, const Slice& key,
-             std::string* timestamp) override;
+             PinnableSlice* value, std::string* timestamp) override;
 
   // TODO: Implement ReadOnly MultiGet?
 
   using DBImpl::NewIterator;
-  virtual Iterator* NewIterator(const ReadOptions&,
+  virtual Iterator* NewIterator(const ReadOptions& _read_options,
                                 ColumnFamilyHandle* column_family) override;
 
   virtual Status NewIterators(
@@ -179,4 +179,3 @@ class DBImplReadOnly : public DBImpl {
   friend class DB;
 };
 }  // namespace ROCKSDB_NAMESPACE
-

db/db_impl/db_impl_secondary.cc

@@ -340,16 +340,36 @@ Status DBImplSecondary::RecoverLogFiles(
 }
 
 // Implementation of the DB interface
-Status DBImplSecondary::Get(const ReadOptions& read_options,
+Status DBImplSecondary::Get(const ReadOptions& _read_options,
                             ColumnFamilyHandle* column_family, const Slice& key,
                             PinnableSlice* value) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
+    return Status::InvalidArgument(
+        "Can only call Get with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
   return GetImpl(read_options, column_family, key, value,
                  /*timestamp*/ nullptr);
 }
 
-Status DBImplSecondary::Get(const ReadOptions& read_options,
+Status DBImplSecondary::Get(const ReadOptions& _read_options,
                             ColumnFamilyHandle* column_family, const Slice& key,
                             PinnableSlice* value, std::string* timestamp) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
+    return Status::InvalidArgument(
+        "Can only call Get with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
   return GetImpl(read_options, column_family, key, value, timestamp);
 }
 
@@ -357,11 +377,6 @@ Status DBImplSecondary::GetImpl(const ReadOptions& read_options,
                                 ColumnFamilyHandle* column_family,
                                 const Slice& key, PinnableSlice* pinnable_val,
                                 std::string* timestamp) {
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`");
-  }
   assert(pinnable_val != nullptr);
   PERF_CPU_TIMER_GUARD(get_cpu_nanos, immutable_db_options_.clock);
   StopWatch sw(immutable_db_options_.clock, stats_, DB_GET);
@@ -452,8 +467,18 @@ Status DBImplSecondary::GetImpl(const ReadOptions& read_options,
   return s;
 }
 
-Iterator* DBImplSecondary::NewIterator(const ReadOptions& read_options,
+Iterator* DBImplSecondary::NewIterator(const ReadOptions& _read_options,
                                        ColumnFamilyHandle* column_family) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
+    return NewErrorIterator(Status::InvalidArgument(
+        "Can only call NewIterator with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`"));
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
+  }
   if (read_options.managed) {
     return NewErrorIterator(
         Status::NotSupported("Managed iterator is not supported anymore."));
@@ -462,16 +487,12 @@ Iterator* DBImplSecondary::NewIterator(const ReadOptions& read_options,
     return NewErrorIterator(Status::NotSupported(
         "ReadTier::kPersistedData is not yet supported in iterators."));
   }
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return NewErrorIterator(Status::InvalidArgument(
-        "Cannot call NewIterator with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`"));
-  }
 
   assert(column_family);
   if (read_options.timestamp) {
-    const Status s = FailIfTsMismatchCf(
+    const Status s =
-        column_family, *(read_options.timestamp), /*ts_for_read=*/true);
+        FailIfTsMismatchCf(column_family, *(read_options.timestamp),
+                           /*ts_for_read=*/true);
     if (!s.ok()) {
       return NewErrorIterator(s);
     }
@@ -523,9 +544,19 @@ ArenaWrappedDBIter* DBImplSecondary::NewIteratorImpl(
 }
 
 Status DBImplSecondary::NewIterators(
-    const ReadOptions& read_options,
+    const ReadOptions& _read_options,
     const std::vector<ColumnFamilyHandle*>& column_families,
     std::vector<Iterator*>* iterators) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
+    return Status::InvalidArgument(
+        "Can only call NewIterators with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
+  }
   if (read_options.managed) {
     return Status::NotSupported("Managed iterator is not supported anymore.");
   }
@@ -533,11 +564,6 @@ Status DBImplSecondary::NewIterators(
     return Status::NotSupported(
         "ReadTier::kPersistedData is not yet supported in iterators.");
   }
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return Status::InvalidArgument(
-        "Cannot call NewIterators with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`");
-  }
   ReadCallback* read_callback = nullptr;  // No read callback provided.
   if (iterators == nullptr) {
     return Status::InvalidArgument("iterators not allowed to be nullptr");

db/db_impl/db_impl_secondary.h

@@ -96,12 +96,13 @@ class DBImplSecondary : public DBImpl {
   // workaround, the secondaries can be opened with `max_open_files=-1` so that
   // it eagerly keeps all talbe files open and is able to access the contents of
   // deleted files via prior open fd.
-  Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
+  Status Get(const ReadOptions& _read_options,
-             const Slice& key, PinnableSlice* value) override;
+             ColumnFamilyHandle* column_family, const Slice& key,
+             PinnableSlice* value) override;
 
-  Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
+  Status Get(const ReadOptions& _read_options,
-             const Slice& key, PinnableSlice* value,
+             ColumnFamilyHandle* column_family, const Slice& key,
-             std::string* timestamp) override;
+             PinnableSlice* value, std::string* timestamp) override;
 
   Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
                  const Slice& key, PinnableSlice* value,
@@ -117,7 +118,7 @@ class DBImplSecondary : public DBImpl {
   // deleted. As a partial hacky workaround, the secondaries can be opened with
   // `max_open_files=-1` so that it eagerly keeps all talbe files open and is
   // able to access the contents of deleted files via prior open fd.
-  Iterator* NewIterator(const ReadOptions&,
+  Iterator* NewIterator(const ReadOptions& _read_options,
                         ColumnFamilyHandle* column_family) override;
 
   ArenaWrappedDBIter* NewIteratorImpl(const ReadOptions& read_options,
@@ -127,7 +128,7 @@ class DBImplSecondary : public DBImpl {
                                       bool expose_blob_index = false,
                                       bool allow_refresh = true);
 
-  Status NewIterators(const ReadOptions& options,
+  Status NewIterators(const ReadOptions& _read_options,
                       const std::vector<ColumnFamilyHandle*>& column_families,
                       std::vector<Iterator*>* iterators) override;
 
@@ -324,4 +325,3 @@ class DBImplSecondary : public DBImpl {
 };
 
 }  // namespace ROCKSDB_NAMESPACE
-

db/db_iter.cc

@@ -77,6 +77,7 @@ DBIter::DBIter(Env* _env, const ReadOptions& read_options,
       expose_blob_index_(expose_blob_index),
       is_blob_(false),
       arena_mode_(arena_mode),
+      io_activity_(read_options.io_activity),
       db_impl_(db_impl),
       cfd_(cfd),
       timestamp_ub_(read_options.timestamp),
@@ -196,12 +197,11 @@ bool DBIter::SetBlobValueIfNeeded(const Slice& user_key,
 
   // TODO: consider moving ReadOptions from ArenaWrappedDBIter to DBIter to
   // avoid having to copy options back and forth.
-  // TODO: plumb Env::IOActivity
   ReadOptions read_options;
   read_options.read_tier = read_tier_;
   read_options.fill_cache = fill_cache_;
   read_options.verify_checksums = verify_checksums_;
-
+  read_options.io_activity = io_activity_;
   constexpr FilePrefetchBuffer* prefetch_buffer = nullptr;
   constexpr uint64_t* bytes_read = nullptr;
 

db/db_iter.h

@@ -384,6 +384,7 @@ class DBIter final : public Iterator {
   bool expose_blob_index_;
   bool is_blob_;
   bool arena_mode_;
+  const Env::IOActivity io_activity_;
   // List of operands for merge operator.
   MergeContext merge_context_;
   LocalStatistics local_stats_;

db/db_rate_limiter_test.cc

@@ -235,9 +235,18 @@ TEST_P(DBRateLimiterOnReadTest, VerifyChecksum) {
   ASSERT_EQ(0, options_.rate_limiter->GetTotalRequests(Env::IO_USER));
 
   ASSERT_OK(db_->VerifyChecksum(GetReadOptions()));
-  // There are 3 reads per file: ReadMetaIndexBlock,
+  // In BufferedIO,
-  // VerifyChecksumInMetaBlocks, VerifyChecksumInBlocks
+  // there are 7 reads per file, each of which will be rate-limited.
-  int expected = kNumFiles * 3;
+  // During open:  read footer, meta index block, properties block, index block.
+  // During actual checksum verification: read meta index block, verify checksum
+  // in meta blocks and verify checksum in file blocks.
+  //
+  // In DirectIO, where we support tail prefetching, during table open, we only
+  // do 1 read instead of 4 as described above. Actual checksum verification
+  // reads stay the same.
+  int num_read_per_file = (!use_direct_io_) ? 7 : 4;
+  int expected = kNumFiles * num_read_per_file;
+
   ASSERT_EQ(expected, options_.rate_limiter->GetTotalRequests(Env::IO_USER));
 }
 

db/external_sst_file_ingestion_job.cc

@@ -217,6 +217,8 @@ Status ExternalSstFileIngestionJob::Prepare(
         std::string requested_checksum_func_name;
         // TODO: rate limit file reads for checksum calculation during file
         // ingestion.
+        // TODO: plumb Env::IOActivity
+        ReadOptions ro;
         IOStatus io_s = GenerateOneFileChecksum(
             fs_.get(), files_to_ingest_[i].internal_file_path,
             db_options_.file_checksum_gen_factory.get(),
@@ -224,8 +226,7 @@ Status ExternalSstFileIngestionJob::Prepare(
             &generated_checksum_func_name,
             ingestion_options_.verify_checksums_readahead_size,
             db_options_.allow_mmap_reads, io_tracer_,
-            db_options_.rate_limiter.get(),
+            db_options_.rate_limiter.get(), ro);
-            Env::IO_TOTAL /* rate_limiter_priority */);
         if (!io_s.ok()) {
           status = io_s;
           ROCKS_LOG_WARN(db_options_.info_log,
@@ -1058,13 +1059,15 @@ IOStatus ExternalSstFileIngestionJob::GenerateChecksumForIngestedFile(
   std::string file_checksum_func_name;
   std::string requested_checksum_func_name;
   // TODO: rate limit file reads for checksum calculation during file ingestion.
+  // TODO: plumb Env::IOActivity
+  ReadOptions ro;
   IOStatus io_s = GenerateOneFileChecksum(
       fs_.get(), file_to_ingest->internal_file_path,
       db_options_.file_checksum_gen_factory.get(), requested_checksum_func_name,
       &file_checksum, &file_checksum_func_name,
       ingestion_options_.verify_checksums_readahead_size,
       db_options_.allow_mmap_reads, io_tracer_, db_options_.rate_limiter.get(),
-      Env::IO_TOTAL /* rate_limiter_priority */);
+      ro);
   if (!io_s.ok()) {
     return io_s;
   }

db_stress_tool/db_stress_common.h

@@ -248,6 +248,7 @@ DECLARE_bool(avoid_flush_during_recovery);
 DECLARE_uint64(max_write_batch_group_size_bytes);
 DECLARE_bool(level_compaction_dynamic_level_bytes);
 DECLARE_int32(verify_checksum_one_in);
+DECLARE_int32(verify_file_checksums_one_in);
 DECLARE_int32(verify_db_one_in);
 DECLARE_int32(continuous_verification_interval);
 DECLARE_int32(get_property_one_in);

db_stress_tool/db_stress_driver.cc

@@ -14,6 +14,7 @@
 
 namespace ROCKSDB_NAMESPACE {
 void ThreadBody(void* v) {
+  ThreadStatusUtil::RegisterThread(db_stress_env, ThreadStatus::USER);
   ThreadState* thread = reinterpret_cast<ThreadState*>(v);
   SharedState* shared = thread->shared;
 
@@ -54,6 +55,7 @@ void ThreadBody(void* v) {
       shared->GetCondVar()->SignalAll();
     }
   }
+  ThreadStatusUtil::UnregisterThread();
 }
 bool RunStressTestImpl(SharedState* shared) {
   SystemClock* clock = db_stress_env->GetSystemClock().get();

db_stress_tool/db_stress_env_wrapper.h

@@ -32,6 +32,48 @@ class DbStressRandomAccessFileWrapper : public FSRandomAccessFileOwnerWrapper {
 #endif
     return target()->Read(offset, n, options, result, scratch, dbg);
   }
+
+  IOStatus MultiRead(FSReadRequest* reqs, size_t num_reqs,
+                     const IOOptions& options, IODebugContext* dbg) override {
+#ifndef NDEBUG
+    const ThreadStatus::OperationType thread_op =
+        ThreadStatusUtil::GetThreadOperation();
+    Env::IOActivity io_activity =
+        ThreadStatusUtil::TEST_GetExpectedIOActivity(thread_op);
+    assert(io_activity == Env::IOActivity::kUnknown ||
+           io_activity == options.io_activity);
+#endif
+    return target()->MultiRead(reqs, num_reqs, options, dbg);
+  }
+
+  IOStatus Prefetch(uint64_t offset, size_t n, const IOOptions& options,
+                    IODebugContext* dbg) override {
+#ifndef NDEBUG
+    const ThreadStatus::OperationType thread_op =
+        ThreadStatusUtil::GetThreadOperation();
+    Env::IOActivity io_activity =
+        ThreadStatusUtil::TEST_GetExpectedIOActivity(thread_op);
+    assert(io_activity == Env::IOActivity::kUnknown ||
+           io_activity == options.io_activity);
+#endif
+    return target()->Prefetch(offset, n, options, dbg);
+  }
+
+  IOStatus ReadAsync(FSReadRequest& req, const IOOptions& options,
+                     std::function<void(const FSReadRequest&, void*)> cb,
+                     void* cb_arg, void** io_handle, IOHandleDeleter* del_fn,
+                     IODebugContext* dbg) override {
+#ifndef NDEBUG
+    const ThreadStatus::OperationType thread_op =
+        ThreadStatusUtil::GetThreadOperation();
+    Env::IOActivity io_activity =
+        ThreadStatusUtil::TEST_GetExpectedIOActivity(thread_op);
+    assert(io_activity == Env::IOActivity::kUnknown ||
+           io_activity == options.io_activity);
+#endif
+    return target()->ReadAsync(req, options, cb, cb_arg, io_handle, del_fn,
+                               dbg);
+  }
 };
 
 class DbStressFSWrapper : public FileSystemWrapper {

db_stress_tool/db_stress_gflags.cc

@@ -929,6 +929,13 @@ DEFINE_int32(verify_checksum_one_in, 0,
              " checksum verification of all the files in the database once for"
              " every N ops on average. 0 indicates that calls to"
              " VerifyChecksum() are disabled.");
+
+DEFINE_int32(verify_file_checksums_one_in, 0,
+             "If non-zero, then DB::VerifyFileChecksums() will be called to do"
+             " checksum verification of all the files in the database once for"
+             " every N ops on average. 0 indicates that calls to"
+             " VerifyFileChecksums() are disabled.");
+
 DEFINE_int32(verify_db_one_in, 0,
              "If non-zero, call VerifyDb() once for every N ops. 0 indicates "
              "that VerifyDb() will not be called in OperateDb(). Note that "

db_stress_tool/db_stress_test_base.cc

@@ -929,12 +929,28 @@ void StressTest::OperateDb(ThreadState* thread) {
       }
 
       if (thread->rand.OneInOpt(FLAGS_verify_checksum_one_in)) {
+        ThreadStatusUtil::SetEnableTracking(FLAGS_enable_thread_tracking);
+        ThreadStatusUtil::SetThreadOperation(
+            ThreadStatus::OperationType::OP_VERIFY_DB_CHECKSUM);
         Status status = db_->VerifyChecksum();
+        ThreadStatusUtil::ResetThreadStatus();
         if (!status.ok()) {
           VerificationAbort(shared, "VerifyChecksum status not OK", status);
         }
       }
 
+      if (thread->rand.OneInOpt(FLAGS_verify_file_checksums_one_in)) {
+        ThreadStatusUtil::SetEnableTracking(FLAGS_enable_thread_tracking);
+        ThreadStatusUtil::SetThreadOperation(
+            ThreadStatus::OperationType::OP_VERIFY_FILE_CHECKSUMS);
+        Status status = db_->VerifyFileChecksums(read_opts);
+        ThreadStatusUtil::ResetThreadStatus();
+        if (!status.ok()) {
+          VerificationAbort(shared, "VerifyFileChecksums status not OK",
+                            status);
+        }
+      }
+
       if (thread->rand.OneInOpt(FLAGS_get_property_one_in)) {
         TestGetProperty(thread);
       }
@@ -1034,10 +1050,18 @@ void StressTest::OperateDb(ThreadState* thread) {
           // If its the last iteration, ensure that multiget_batch_size is 1
           multiget_batch_size = std::max(multiget_batch_size, 1);
           rand_keys = GenerateNKeys(thread, multiget_batch_size, i);
+          ThreadStatusUtil::SetEnableTracking(FLAGS_enable_thread_tracking);
+          ThreadStatusUtil::SetThreadOperation(
+              ThreadStatus::OperationType::OP_MULTIGET);
           TestMultiGet(thread, read_opts, rand_column_families, rand_keys);
+          ThreadStatusUtil::ResetThreadStatus();
           i += multiget_batch_size - 1;
         } else {
+          ThreadStatusUtil::SetEnableTracking(FLAGS_enable_thread_tracking);
+          ThreadStatusUtil::SetThreadOperation(
+              ThreadStatus::OperationType::OP_GET);
           TestGet(thread, read_opts, rand_column_families, rand_keys);
+          ThreadStatusUtil::ResetThreadStatus();
         }
       } else if (prob_op < prefix_bound) {
         assert(static_cast<int>(FLAGS_readpercent) <= prob_op);
@@ -1066,8 +1090,12 @@ void StressTest::OperateDb(ThreadState* thread) {
         if (!FLAGS_skip_verifydb &&
             thread->rand.OneInOpt(
                 FLAGS_verify_iterator_with_expected_state_one_in)) {
+          ThreadStatusUtil::SetEnableTracking(FLAGS_enable_thread_tracking);
+          ThreadStatusUtil::SetThreadOperation(
+              ThreadStatus::OperationType::OP_DBITERATOR);
           TestIterateAgainstExpected(thread, read_opts, rand_column_families,
                                      rand_keys);
+          ThreadStatusUtil::ResetThreadStatus();
         } else {
           int num_seeks = static_cast<int>(std::min(
               std::max(static_cast<uint64_t>(thread->rand.Uniform(4)),
@@ -1076,7 +1104,11 @@ void StressTest::OperateDb(ThreadState* thread) {
                        static_cast<uint64_t>(1))));
           rand_keys = GenerateNKeys(thread, num_seeks, i);
           i += num_seeks - 1;
+          ThreadStatusUtil::SetEnableTracking(FLAGS_enable_thread_tracking);
+          ThreadStatusUtil::SetThreadOperation(
+              ThreadStatus::OperationType::OP_DBITERATOR);
           TestIterate(thread, read_opts, rand_column_families, rand_keys);
+          ThreadStatusUtil::ResetThreadStatus();
         }
       } else {
         assert(iterate_bound <= prob_op);

db_stress_tool/no_batched_ops_stress.cc

@@ -585,6 +585,7 @@ class NonBatchedOpsStressTest : public StressTest {
     bool do_consistency_check = thread->rand.OneIn(4);
 
     ReadOptions readoptionscopy = read_opts;
+
     if (do_consistency_check) {
       readoptionscopy.snapshot = db_->GetSnapshot();
     }
@@ -778,9 +779,17 @@ class NonBatchedOpsStressTest : public StressTest {
 
         if (use_txn) {
           assert(txn);
+          ThreadStatusUtil::SetThreadOperation(
+              ThreadStatus::OperationType::OP_GET);
           tmp_s = txn->Get(readoptionscopy, cfh, key, &value);
+          ThreadStatusUtil::SetThreadOperation(
+              ThreadStatus::OperationType::OP_MULTIGET);
         } else {
+          ThreadStatusUtil::SetThreadOperation(
+              ThreadStatus::OperationType::OP_GET);
           tmp_s = db_->Get(readoptionscopy, cfh, key, &value);
+          ThreadStatusUtil::SetThreadOperation(
+              ThreadStatus::OperationType::OP_MULTIGET);
         }
         if (!tmp_s.ok() && !tmp_s.IsNotFound()) {
           fprintf(stderr, "Get error: %s\n", s.ToString().c_str());

file/file_prefetch_buffer.cc

@@ -81,13 +81,12 @@ void FilePrefetchBuffer::CalculateOffsetAndLen(size_t alignment,
 
 Status FilePrefetchBuffer::Read(const IOOptions& opts,
                                 RandomAccessFileReader* reader,
-                                Env::IOPriority rate_limiter_priority,
                                 uint64_t read_len, uint64_t chunk_len,
                                 uint64_t rounddown_start, uint32_t index) {
   Slice result;
   Status s = reader->Read(opts, rounddown_start + chunk_len, read_len, &result,
                           bufs_[index].buffer_.BufferStart() + chunk_len,
-                          /*aligned_buf=*/nullptr, rate_limiter_priority);
+                          /*aligned_buf=*/nullptr);
 #ifndef NDEBUG
   if (result.size() < read_len) {
     // Fake an IO error to force db_stress fault injection to ignore
@@ -134,8 +133,7 @@ Status FilePrefetchBuffer::ReadAsync(const IOOptions& opts,
 
 Status FilePrefetchBuffer::Prefetch(const IOOptions& opts,
                                     RandomAccessFileReader* reader,
-                                    uint64_t offset, size_t n,
+                                    uint64_t offset, size_t n) {
-                                    Env::IOPriority rate_limiter_priority) {
   if (!enable_ || reader == nullptr) {
     return Status::OK();
   }
@@ -160,8 +158,7 @@ Status FilePrefetchBuffer::Prefetch(const IOOptions& opts,
                         true /*refit_tail*/, chunk_len);
   size_t read_len = static_cast<size_t>(roundup_len - chunk_len);
 
-  Status s = Read(opts, reader, rate_limiter_priority, read_len, chunk_len,
+  Status s = Read(opts, reader, read_len, chunk_len, rounddown_offset, curr_);
-                  rounddown_offset, curr_);
   if (usage_ == FilePrefetchBufferUsage::kTableOpenPrefetchTail && s.ok()) {
     RecordInHistogram(stats_, TABLE_OPEN_PREFETCH_TAIL_READ_BYTES, read_len);
   }
@@ -328,8 +325,7 @@ void FilePrefetchBuffer::PollAndUpdateBuffersIfNeeded(uint64_t offset) {
 
 Status FilePrefetchBuffer::HandleOverlappingData(
     const IOOptions& opts, RandomAccessFileReader* reader, uint64_t offset,
-    size_t length, size_t readahead_size,
+    size_t length, size_t readahead_size, bool& copy_to_third_buffer,
-    Env::IOPriority /*rate_limiter_priority*/, bool& copy_to_third_buffer,
     uint64_t& tmp_offset, size_t& tmp_length) {
   Status s;
   size_t alignment = reader->file()->GetRequiredBufferAlignment();
@@ -412,10 +408,11 @@ Status FilePrefetchBuffer::HandleOverlappingData(
 //        curr_, send async request on curr_, wait for poll to fill second
 //        buffer (if any), and copy remaining data from second buffer to third
 //        buffer.
-Status FilePrefetchBuffer::PrefetchAsyncInternal(
+Status FilePrefetchBuffer::PrefetchAsyncInternal(const IOOptions& opts,
-    const IOOptions& opts, RandomAccessFileReader* reader, uint64_t offset,
+                                                 RandomAccessFileReader* reader,
-    size_t length, size_t readahead_size, Env::IOPriority rate_limiter_priority,
+                                                 uint64_t offset, size_t length,
-    bool& copy_to_third_buffer) {
+                                                 size_t readahead_size,
+                                                 bool& copy_to_third_buffer) {
   if (!enable_) {
     return Status::OK();
   }
@@ -442,8 +439,7 @@ Status FilePrefetchBuffer::PrefetchAsyncInternal(
   //   - switch buffers and curr_ now points to second buffer to copy remaining
   //     data.
   s = HandleOverlappingData(opts, reader, offset, length, readahead_size,
-                            rate_limiter_priority, copy_to_third_buffer,
+                            copy_to_third_buffer, tmp_offset, tmp_length);
-                            tmp_offset, tmp_length);
   if (!s.ok()) {
     return s;
   }
@@ -581,8 +577,7 @@ Status FilePrefetchBuffer::PrefetchAsyncInternal(
   }
 
   if (read_len1 > 0) {
-    s = Read(opts, reader, rate_limiter_priority, read_len1, chunk_len1,
+    s = Read(opts, reader, read_len1, chunk_len1, rounddown_start1, curr_);
-             rounddown_start1, curr_);
     if (!s.ok()) {
       if (bufs_[second].io_handle_ != nullptr) {
         std::vector<void*> handles;
@@ -610,10 +605,9 @@ bool FilePrefetchBuffer::TryReadFromCache(const IOOptions& opts,
                                           RandomAccessFileReader* reader,
                                           uint64_t offset, size_t n,
                                           Slice* result, Status* status,
-                                          Env::IOPriority rate_limiter_priority,
                                           bool for_compaction /* = false */) {
   bool ret = TryReadFromCacheUntracked(opts, reader, offset, n, result, status,
-                                       rate_limiter_priority, for_compaction);
+                                       for_compaction);
   if (usage_ == FilePrefetchBufferUsage::kTableOpenPrefetchTail && enable_) {
     if (ret) {
       RecordTick(stats_, TABLE_OPEN_PREFETCH_TAIL_HIT);
@@ -627,7 +621,7 @@ bool FilePrefetchBuffer::TryReadFromCache(const IOOptions& opts,
 bool FilePrefetchBuffer::TryReadFromCacheUntracked(
     const IOOptions& opts, RandomAccessFileReader* reader, uint64_t offset,
     size_t n, Slice* result, Status* status,
-    Env::IOPriority rate_limiter_priority, bool for_compaction /* = false */) {
+    bool for_compaction /* = false */) {
   if (track_min_offset_ && offset < min_offset_read_) {
     min_offset_read_ = static_cast<size_t>(offset);
   }
@@ -647,8 +641,7 @@ bool FilePrefetchBuffer::TryReadFromCacheUntracked(
       assert(reader != nullptr);
       assert(max_readahead_size_ >= readahead_size_);
       if (for_compaction) {
-        s = Prefetch(opts, reader, offset, std::max(n, readahead_size_),
+        s = Prefetch(opts, reader, offset, std::max(n, readahead_size_));
-                     rate_limiter_priority);
       } else {
         if (implicit_auto_readahead_) {
           if (!IsEligibleForPrefetch(offset, n)) {
@@ -657,8 +650,7 @@ bool FilePrefetchBuffer::TryReadFromCacheUntracked(
             return false;
           }
         }
-        s = Prefetch(opts, reader, offset, n + readahead_size_,
+        s = Prefetch(opts, reader, offset, n + readahead_size_);
-                     rate_limiter_priority);
       }
       if (!s.ok()) {
         if (status) {
@@ -681,12 +673,12 @@ bool FilePrefetchBuffer::TryReadFromCacheUntracked(
   return true;
 }
 
-bool FilePrefetchBuffer::TryReadFromCacheAsync(
+bool FilePrefetchBuffer::TryReadFromCacheAsync(const IOOptions& opts,
-    const IOOptions& opts, RandomAccessFileReader* reader, uint64_t offset,
+                                               RandomAccessFileReader* reader,
-    size_t n, Slice* result, Status* status,
+                                               uint64_t offset, size_t n,
-    Env::IOPriority rate_limiter_priority) {
+                                               Slice* result, Status* status) {
-  bool ret = TryReadFromCacheAsyncUntracked(opts, reader, offset, n, result,
+  bool ret =
-                                            status, rate_limiter_priority);
+      TryReadFromCacheAsyncUntracked(opts, reader, offset, n, result, status);
   if (usage_ == FilePrefetchBufferUsage::kTableOpenPrefetchTail && enable_) {
     if (ret) {
       RecordTick(stats_, TABLE_OPEN_PREFETCH_TAIL_HIT);
@@ -699,8 +691,7 @@ bool FilePrefetchBuffer::TryReadFromCacheAsync(
 
 bool FilePrefetchBuffer::TryReadFromCacheAsyncUntracked(
     const IOOptions& opts, RandomAccessFileReader* reader, uint64_t offset,
-    size_t n, Slice* result, Status* status,
+    size_t n, Slice* result, Status* status) {
-    Env::IOPriority rate_limiter_priority) {
   if (track_min_offset_ && offset < min_offset_read_) {
     min_offset_read_ = static_cast<size_t>(offset);
   }
@@ -755,7 +746,7 @@ bool FilePrefetchBuffer::TryReadFromCacheAsyncUntracked(
       // Prefetch n + readahead_size_/2 synchronously as remaining
       // readahead_size_/2 will be prefetched asynchronously.
       s = PrefetchAsyncInternal(opts, reader, offset, n, readahead_size_ / 2,
-                                rate_limiter_priority, copy_to_third_buffer);
+                                copy_to_third_buffer);
       explicit_prefetch_submitted_ = false;
       if (!s.ok()) {
         if (status) {

file/file_prefetch_buffer.h

@@ -183,14 +183,12 @@ class FilePrefetchBuffer {
   bool Enabled() const { return enable_; }
 
   // Load data into the buffer from a file.
+  // opts                  : the IO options to use.
   // reader                : the file reader.
   // offset                : the file offset to start reading from.
   // n                     : the number of bytes to read.
-  // rate_limiter_priority : rate limiting priority, or `Env::IO_TOTAL` to
-  //                         bypass.
   Status Prefetch(const IOOptions& opts, RandomAccessFileReader* reader,
-                  uint64_t offset, size_t n,
+                  uint64_t offset, size_t n);
-                  Env::IOPriority rate_limiter_priority);
 
   // Request for reading the data from a file asynchronously.
   // If data already exists in the buffer, result will be updated.
@@ -217,18 +215,14 @@ class FilePrefetchBuffer {
   // n                     : the number of bytes.
   // result                : output buffer to put the data into.
   // s                     : output status.
-  // rate_limiter_priority : rate limiting priority, or `Env::IO_TOTAL` to
-  //                         bypass.
   // for_compaction        : true if cache read is done for compaction read.
   bool TryReadFromCache(const IOOptions& opts, RandomAccessFileReader* reader,
                         uint64_t offset, size_t n, Slice* result, Status* s,
-                        Env::IOPriority rate_limiter_priority,
                         bool for_compaction = false);
 
   bool TryReadFromCacheAsync(const IOOptions& opts,
                              RandomAccessFileReader* reader, uint64_t offset,
-                             size_t n, Slice* result, Status* status,
+                             size_t n, Slice* result, Status* status);
-                             Env::IOPriority rate_limiter_priority);
 
   // The minimum `offset` ever passed to TryReadFromCache(). This will nly be
   // tracked if track_min_offset = true.
@@ -305,12 +299,11 @@ class FilePrefetchBuffer {
   Status PrefetchAsyncInternal(const IOOptions& opts,
                                RandomAccessFileReader* reader, uint64_t offset,
                                size_t length, size_t readahead_size,
-                               Env::IOPriority rate_limiter_priority,
                                bool& copy_to_third_buffer);
 
   Status Read(const IOOptions& opts, RandomAccessFileReader* reader,
-              Env::IOPriority rate_limiter_priority, uint64_t read_len,
+              uint64_t read_len, uint64_t chunk_len, uint64_t rounddown_start,
-              uint64_t chunk_len, uint64_t rounddown_start, uint32_t index);
+              uint32_t index);
 
   Status ReadAsync(const IOOptions& opts, RandomAccessFileReader* reader,
                    uint64_t read_len, uint64_t rounddown_start, uint32_t index);
@@ -409,7 +402,6 @@ class FilePrefetchBuffer {
   Status HandleOverlappingData(const IOOptions& opts,
                                RandomAccessFileReader* reader, uint64_t offset,
                                size_t length, size_t readahead_size,
-                               Env::IOPriority rate_limiter_priority,
                                bool& copy_to_third_buffer, uint64_t& tmp_offset,
                                size_t& tmp_length);
 
@@ -417,14 +409,12 @@ class FilePrefetchBuffer {
                                  RandomAccessFileReader* reader,
                                  uint64_t offset, size_t n, Slice* result,
                                  Status* s,
-                                 Env::IOPriority rate_limiter_priority,
                                  bool for_compaction = false);
 
   bool TryReadFromCacheAsyncUntracked(const IOOptions& opts,
                                       RandomAccessFileReader* reader,
                                       uint64_t offset, size_t n, Slice* result,
-                                      Status* status,
+                                      Status* status);
-                                      Env::IOPriority rate_limiter_priority);
 
   std::vector<BufferInfo> bufs_;
   // curr_ represents the index for bufs_ indicating which buffer is being

file/file_util.cc

@@ -137,7 +137,7 @@ IOStatus GenerateOneFileChecksum(
     std::string* file_checksum_func_name,
     size_t verify_checksums_readahead_size, bool /*allow_mmap_reads*/,
     std::shared_ptr<IOTracer>& io_tracer, RateLimiter* rate_limiter,
-    Env::IOPriority rate_limiter_priority) {
+    const ReadOptions& read_options) {
   if (checksum_factory == nullptr) {
     return IOStatus::InvalidArgument("Checksum factory is invalid");
   }
@@ -206,11 +206,15 @@ IOStatus GenerateOneFileChecksum(
   Slice slice;
   uint64_t offset = 0;
   IOOptions opts;
+  io_s = reader->PrepareIOOptions(read_options, opts);
+  if (!io_s.ok()) {
+    return io_s;
+  }
   while (size > 0) {
     size_t bytes_to_read =
         static_cast<size_t>(std::min(uint64_t{readahead_size}, size));
-    io_s = reader->Read(opts, offset, bytes_to_read, &slice, buf.get(), nullptr,
+    io_s =
-                        rate_limiter_priority);
+        reader->Read(opts, offset, bytes_to_read, &slice, buf.get(), nullptr);
     if (!io_s.ok()) {
       return IOStatus::Corruption("file read failed with error: " +
                                   io_s.ToString());

file/file_util.h

@@ -59,7 +59,7 @@ extern IOStatus GenerateOneFileChecksum(
     std::string* file_checksum_func_name,
     size_t verify_checksums_readahead_size, bool allow_mmap_reads,
     std::shared_ptr<IOTracer>& io_tracer, RateLimiter* rate_limiter,
-    Env::IOPriority rate_limiter_priority);
+    const ReadOptions& read_options);
 
 inline IOStatus PrepareIOFromReadOptions(const ReadOptions& ro,
                                          SystemClock* clock, IOOptions& opts) {

file/prefetch_test.cc

@@ -2606,8 +2606,10 @@ TEST_F(FilePrefetchBufferTest, SeekWithBlockCacheHit) {
   fpb.UpdateReadPattern(0, 4096, false);
   // Now read some data that straddles the two prefetch buffers - offset 8192 to
   // 16384
-  ASSERT_TRUE(fpb.TryReadFromCacheAsync(IOOptions(), r.get(), 8192, 8192,
+  IOOptions io_opts;
-                                        &result, &s, Env::IOPriority::IO_LOW));
+  io_opts.rate_limiter_priority = Env::IOPriority::IO_LOW;
+  ASSERT_TRUE(
+      fpb.TryReadFromCacheAsync(io_opts, r.get(), 8192, 8192, &result, &s));
 }
 
 TEST_F(FilePrefetchBufferTest, NoSyncWithAsyncIO) {
@@ -2642,9 +2644,10 @@ TEST_F(FilePrefetchBufferTest, NoSyncWithAsyncIO) {
   }
 
   ASSERT_TRUE(s.IsTryAgain());
-  ASSERT_TRUE(fpb.TryReadFromCacheAsync(IOOptions(), r.get(), /*offset=*/3000,
+  IOOptions io_opts;
-                                        /*length=*/4000, &async_result, &s,
+  io_opts.rate_limiter_priority = Env::IOPriority::IO_LOW;
-                                        Env::IOPriority::IO_LOW));
+  ASSERT_TRUE(fpb.TryReadFromCacheAsync(io_opts, r.get(), /*offset=*/3000,
+                                        /*length=*/4000, &async_result, &s));
   // No sync call should be made.
   HistogramData sst_read_micros;
   stats()->histogramData(SST_READ_MICROS, &sst_read_micros);

file/random_access_file_reader.cc

@@ -22,12 +22,37 @@
 #include "util/rate_limiter_impl.h"
 
 namespace ROCKSDB_NAMESPACE {
-const std::array<Histograms, std::size_t(Env::IOActivity::kUnknown)>
+inline Histograms GetFileReadHistograms(Statistics* stats,
-    kReadHistograms{{
+                                        Env::IOActivity io_activity) {
-        FILE_READ_FLUSH_MICROS,
+  switch (io_activity) {
-        FILE_READ_COMPACTION_MICROS,
+    case Env::IOActivity::kFlush:
-        FILE_READ_DB_OPEN_MICROS,
+      return Histograms::FILE_READ_FLUSH_MICROS;
-    }};
+    case Env::IOActivity::kCompaction:
+      return Histograms::FILE_READ_COMPACTION_MICROS;
+    case Env::IOActivity::kDBOpen:
+      return Histograms::FILE_READ_DB_OPEN_MICROS;
+    default:
+      break;
+  }
+
+  if (stats && stats->get_stats_level() > StatsLevel::kExceptDetailedTimers) {
+    switch (io_activity) {
+      case Env::IOActivity::kGet:
+        return Histograms::FILE_READ_GET_MICROS;
+      case Env::IOActivity::kMultiGet:
+        return Histograms::FILE_READ_MULTIGET_MICROS;
+      case Env::IOActivity::kDBIterator:
+        return Histograms::FILE_READ_DB_ITERATOR_MICROS;
+      case Env::IOActivity::kVerifyDBChecksum:
+        return Histograms::FILE_READ_VERIFY_DB_CHECKSUM_MICROS;
+      case Env::IOActivity::kVerifyFileChecksums:
+        return Histograms::FILE_READ_VERIFY_FILE_CHECKSUMS_MICROS;
+      default:
+        break;
+    }
+  }
+  return Histograms::HISTOGRAM_ENUM_MAX;
+}
 inline void RecordIOStats(Statistics* stats, Temperature file_temperature,
                           bool is_last_level, size_t size) {
   IOSTATS_ADD(bytes_read, size);
@@ -79,11 +104,11 @@ IOStatus RandomAccessFileReader::Create(
   return io_s;
 }
 
-IOStatus RandomAccessFileReader::Read(
+IOStatus RandomAccessFileReader::Read(const IOOptions& opts, uint64_t offset,
-    const IOOptions& opts, uint64_t offset, size_t n, Slice* result,
+                                      size_t n, Slice* result, char* scratch,
-    char* scratch, AlignedBuf* aligned_buf,
+                                      AlignedBuf* aligned_buf) const {
-    Env::IOPriority rate_limiter_priority) const {
   (void)aligned_buf;
+  const Env::IOPriority rate_limiter_priority = opts.rate_limiter_priority;
 
   TEST_SYNC_POINT_CALLBACK("RandomAccessFileReader::Read", nullptr);
 
@@ -108,9 +133,7 @@ IOStatus RandomAccessFileReader::Read(
 
   {
     StopWatch sw(clock_, stats_, hist_type_,
-                 (opts.io_activity != Env::IOActivity::kUnknown)
+                 GetFileReadHistograms(stats_, opts.io_activity),
-                     ? kReadHistograms[(std::size_t)(opts.io_activity)]
-                     : Histograms::HISTOGRAM_ENUM_MAX,
                  (stats_ != nullptr) ? &elapsed : nullptr, true /*overwrite*/,
                  true /*delay_enabled*/);
     auto prev_perf_level = GetPerfLevel();
@@ -277,9 +300,10 @@ bool TryMerge(FSReadRequest* dest, const FSReadRequest& src) {
   return true;
 }
 
-IOStatus RandomAccessFileReader::MultiRead(
+IOStatus RandomAccessFileReader::MultiRead(const IOOptions& opts,
-    const IOOptions& opts, FSReadRequest* read_reqs, size_t num_reqs,
+                                           FSReadRequest* read_reqs,
-    AlignedBuf* aligned_buf, Env::IOPriority rate_limiter_priority) const {
+                                           size_t num_reqs,
+                                           AlignedBuf* aligned_buf) const {
   (void)aligned_buf;  // suppress warning of unused variable in LITE mode
   assert(num_reqs > 0);
 
@@ -288,6 +312,7 @@ IOStatus RandomAccessFileReader::MultiRead(
     assert(read_reqs[i].offset <= read_reqs[i + 1].offset);
   }
 #endif  // !NDEBUG
+  const Env::IOPriority rate_limiter_priority = opts.rate_limiter_priority;
 
   // To be paranoid modify scratch a little bit, so in case underlying
   // FileSystem doesn't fill the buffer but return success and `scratch` returns
@@ -304,9 +329,7 @@ IOStatus RandomAccessFileReader::MultiRead(
   uint64_t elapsed = 0;
   {
     StopWatch sw(clock_, stats_, hist_type_,
-                 (opts.io_activity != Env::IOActivity::kUnknown)
+                 GetFileReadHistograms(stats_, opts.io_activity),
-                     ? kReadHistograms[(std::size_t)(opts.io_activity)]
-                     : Histograms::HISTOGRAM_ENUM_MAX,
                  (stats_ != nullptr) ? &elapsed : nullptr, true /*overwrite*/,
                  true /*delay_enabled*/);
     auto prev_perf_level = GetPerfLevel();
@@ -495,16 +518,16 @@ IOStatus RandomAccessFileReader::ReadAsync(
 
     assert(read_async_info->buf_.CurrentSize() == 0);
 
-    StopWatch sw(clock_, nullptr /*stats*/,
+    StopWatch sw(clock_, stats_, hist_type_,
-                 Histograms::HISTOGRAM_ENUM_MAX /*hist_type*/,
+                 GetFileReadHistograms(stats_, opts.io_activity),
-                 Histograms::HISTOGRAM_ENUM_MAX, &elapsed, true /*overwrite*/,
+                 (stats_ != nullptr) ? &elapsed : nullptr, true /*overwrite*/,
                  true /*delay_enabled*/);
     s = file_->ReadAsync(aligned_req, opts, read_async_callback,
                          read_async_info, io_handle, del_fn, nullptr /*dbg*/);
   } else {
-    StopWatch sw(clock_, nullptr /*stats*/,
+    StopWatch sw(clock_, stats_, hist_type_,
-                 Histograms::HISTOGRAM_ENUM_MAX /*hist_type*/,
+                 GetFileReadHistograms(stats_, opts.io_activity),
-                 Histograms::HISTOGRAM_ENUM_MAX, &elapsed, true /*overwrite*/,
+                 (stats_ != nullptr) ? &elapsed : nullptr, true /*overwrite*/,
                  true /*delay_enabled*/);
     s = file_->ReadAsync(req, opts, read_async_callback, read_async_info,
                          io_handle, del_fn, nullptr /*dbg*/);

file/random_access_file_reader.h

@@ -164,31 +164,18 @@ class RandomAccessFileReader {
   // 2. Otherwise, scratch is not used and can be null, the aligned_buf owns
   // the internally allocated buffer on return, and the result refers to a
   // region in aligned_buf.
-  //
-  // `rate_limiter_priority` is used to charge the internal rate limiter when
-  // enabled. The special value `Env::IO_TOTAL` makes this operation bypass the
-  // rate limiter.
   IOStatus Read(const IOOptions& opts, uint64_t offset, size_t n, Slice* result,
-                char* scratch, AlignedBuf* aligned_buf,
+                char* scratch, AlignedBuf* aligned_buf) const;
-                Env::IOPriority rate_limiter_priority) const;
 
   // REQUIRES:
   // num_reqs > 0, reqs do not overlap, and offsets in reqs are increasing.
   // In non-direct IO mode, aligned_buf should be null;
   // In direct IO mode, aligned_buf stores the aligned buffer allocated inside
   // MultiRead, the result Slices in reqs refer to aligned_buf.
-  //
-  // `rate_limiter_priority` will be used to charge the internal rate limiter.
-  // It is not yet supported so the client must provide the special value
-  // `Env::IO_TOTAL` to bypass the rate limiter.
   IOStatus MultiRead(const IOOptions& opts, FSReadRequest* reqs,
-                     size_t num_reqs, AlignedBuf* aligned_buf,
+                     size_t num_reqs, AlignedBuf* aligned_buf) const;
-                     Env::IOPriority rate_limiter_priority) const;
 
-  IOStatus Prefetch(uint64_t offset, size_t n,
+  IOStatus Prefetch(const IOOptions& opts, uint64_t offset, size_t n) const {
-                    const Env::IOPriority rate_limiter_priority) const {
-    IOOptions opts;
-    opts.rate_limiter_priority = rate_limiter_priority;
     return file_->Prefetch(offset, n, opts, nullptr);
   }
 

file/random_access_file_reader_test.cc

@@ -83,8 +83,9 @@ TEST_F(RandomAccessFileReaderTest, ReadDirectIO) {
   Slice result;
   AlignedBuf buf;
   for (Env::IOPriority rate_limiter_priority : {Env::IO_LOW, Env::IO_TOTAL}) {
-    ASSERT_OK(r->Read(IOOptions(), offset, len, &result, nullptr, &buf,
+    IOOptions io_opts;
-                      rate_limiter_priority));
+    io_opts.rate_limiter_priority = rate_limiter_priority;
+    ASSERT_OK(r->Read(io_opts, offset, len, &result, nullptr, &buf));
     ASSERT_EQ(result.ToString(), content.substr(offset, len));
   }
 }
@@ -146,8 +147,8 @@ TEST_F(RandomAccessFileReaderTest, MultiReadDirectIO) {
     reqs.push_back(std::move(r0));
     reqs.push_back(std::move(r1));
     AlignedBuf aligned_buf;
-    ASSERT_OK(r->MultiRead(IOOptions(), reqs.data(), reqs.size(), &aligned_buf,
+    ASSERT_OK(
-                           Env::IO_TOTAL /*rate_limiter_priority*/));
+        r->MultiRead(IOOptions(), reqs.data(), reqs.size(), &aligned_buf));
 
     AssertResult(content, reqs);
 
@@ -191,8 +192,8 @@ TEST_F(RandomAccessFileReaderTest, MultiReadDirectIO) {
     reqs.push_back(std::move(r1));
     reqs.push_back(std::move(r2));
     AlignedBuf aligned_buf;
-    ASSERT_OK(r->MultiRead(IOOptions(), reqs.data(), reqs.size(), &aligned_buf,
+    ASSERT_OK(
-                           Env::IO_TOTAL /*rate_limiter_priority*/));
+        r->MultiRead(IOOptions(), reqs.data(), reqs.size(), &aligned_buf));
 
     AssertResult(content, reqs);
 
@@ -236,8 +237,8 @@ TEST_F(RandomAccessFileReaderTest, MultiReadDirectIO) {
     reqs.push_back(std::move(r1));
     reqs.push_back(std::move(r2));
     AlignedBuf aligned_buf;
-    ASSERT_OK(r->MultiRead(IOOptions(), reqs.data(), reqs.size(), &aligned_buf,
+    ASSERT_OK(
-                           Env::IO_TOTAL /*rate_limiter_priority*/));
+        r->MultiRead(IOOptions(), reqs.data(), reqs.size(), &aligned_buf));
 
     AssertResult(content, reqs);
 
@@ -273,8 +274,8 @@ TEST_F(RandomAccessFileReaderTest, MultiReadDirectIO) {
     reqs.push_back(std::move(r0));
     reqs.push_back(std::move(r1));
     AlignedBuf aligned_buf;
-    ASSERT_OK(r->MultiRead(IOOptions(), reqs.data(), reqs.size(), &aligned_buf,
+    ASSERT_OK(
-                           Env::IO_TOTAL /*rate_limiter_priority*/));
+        r->MultiRead(IOOptions(), reqs.data(), reqs.size(), &aligned_buf));
 
     AssertResult(content, reqs);
 

file/sequence_file_reader.h

@@ -99,6 +99,9 @@ class SequentialFileReader {
   // when less than n bytes are actually read (e.g. at end of file). To avoid
   // overcharging the rate limiter, the caller can use file size to cap n to
   // read until end of file.
+  //
+  // TODO(hx235): accept parameter `IOOptions` containing
+  // `rate_limiter_priority` like RandomAccessFileReader::Read()
   IOStatus Read(size_t n, Slice* result, char* scratch,
                 Env::IOPriority rate_limiter_priority);
 

include/rocksdb/convenience.h

@@ -459,7 +459,7 @@ Status VerifySstFileChecksum(const Options& options,
 // Verify the checksum of file
 Status VerifySstFileChecksum(const Options& options,
                              const EnvOptions& env_options,
-                             const ReadOptions& read_options,
+                             const ReadOptions& _read_options,
                              const std::string& file_path,
                              const SequenceNumber& largest_seqno = 0);
 

include/rocksdb/env.h

@@ -441,6 +441,11 @@ class Env : public Customizable {
     kFlush = 0,
     kCompaction = 1,
     kDBOpen = 2,
+    kGet = 3,
+    kMultiGet = 4,
+    kDBIterator = 5,
+    kVerifyDBChecksum = 6,
+    kVerifyFileChecksums = 7,
     kUnknown,  // Keep last for easy array of non-unknowns
   };
 

include/rocksdb/statistics.h

@@ -555,6 +555,13 @@ enum Histograms : uint32_t {
   FILE_READ_FLUSH_MICROS,
   FILE_READ_COMPACTION_MICROS,
   FILE_READ_DB_OPEN_MICROS,
+  // The following `FILE_READ_*` require stats level greater than
+  // `StatsLevel::kExceptDetailedTimers`
+  FILE_READ_GET_MICROS,
+  FILE_READ_MULTIGET_MICROS,
+  FILE_READ_DB_ITERATOR_MICROS,
+  FILE_READ_VERIFY_DB_CHECKSUM_MICROS,
+  FILE_READ_VERIFY_FILE_CHECKSUMS_MICROS,
 
   // The number of subcompactions actually scheduled during a compaction
   NUM_SUBCOMPACTIONS_SCHEDULED,

include/rocksdb/thread_status.h

@@ -57,6 +57,11 @@ struct ThreadStatus {
     OP_COMPACTION,
     OP_FLUSH,
     OP_DBOPEN,
+    OP_GET,
+    OP_MULTIGET,
+    OP_DBITERATOR,
+    OP_VERIFY_DB_CHECKSUM,
+    OP_VERIFY_FILE_CHECKSUMS,
     NUM_OP_TYPES
   };
 

include/rocksdb/utilities/transaction.h

@@ -335,8 +335,22 @@ class Transaction {
                         const size_t num_keys, const Slice* keys,
                         PinnableSlice* values, Status* statuses,
                         const bool /*sorted_input*/ = false) {
+    if (options.io_activity != Env::IOActivity::kUnknown &&
+        options.io_activity != Env::IOActivity::kMultiGet) {
+      Status s = Status::InvalidArgument(
+          "Can only call MultiGet with `ReadOptions::io_activity` is "
+          "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+
+      for (size_t i = 0; i < num_keys; ++i) {
+        if (statuses[i].ok()) {
+          statuses[i] = s;
+        }
+      }
+      return;
+    }
+
     for (size_t i = 0; i < num_keys; ++i) {
-      statuses[i] = Get(options, column_family, keys[i], &values[i]);
+      statuses[i] = GetImpl(options, column_family, keys[i], &values[i]);
     }
   }
 
@@ -673,6 +687,21 @@ class Transaction {
     id_ = id;
   }
 
+  virtual Status GetImpl(const ReadOptions& /* options */,
+                         ColumnFamilyHandle* /* column_family */,
+                         const Slice& /* key */, std::string* /* value */) {
+    return Status::NotSupported("Not implemented");
+  }
+
+  virtual Status GetImpl(const ReadOptions& options,
+                         ColumnFamilyHandle* column_family, const Slice& key,
+                         PinnableSlice* pinnable_val) {
+    assert(pinnable_val != nullptr);
+    auto s = GetImpl(options, column_family, key, pinnable_val->GetSelf());
+    pinnable_val->PinSelf();
+    return s;
+  }
+
   virtual uint64_t GetLastLogNumber() const { return log_number_; }
 
  private:

java/rocksjni/portal.h

@@ -5629,6 +5629,17 @@ class HistogramTypeJni {
         return 0x3B;
       case ROCKSDB_NAMESPACE::Histograms::FILE_READ_DB_OPEN_MICROS:
         return 0x3C;
+      case ROCKSDB_NAMESPACE::Histograms::FILE_READ_GET_MICROS:
+        return 0x3D;
+      case ROCKSDB_NAMESPACE::Histograms::FILE_READ_MULTIGET_MICROS:
+        return 0x3E;
+      case ROCKSDB_NAMESPACE::Histograms::FILE_READ_DB_ITERATOR_MICROS:
+        return 0x3F;
+      case ROCKSDB_NAMESPACE::Histograms::FILE_READ_VERIFY_DB_CHECKSUM_MICROS:
+        return 0x40;
+      case ROCKSDB_NAMESPACE::Histograms::
+          FILE_READ_VERIFY_FILE_CHECKSUMS_MICROS:
+        return 0x41;
       case ROCKSDB_NAMESPACE::Histograms::HISTOGRAM_ENUM_MAX:
         // 0x1F for backwards compatibility on current minor version.
         return 0x1F;
@@ -5754,6 +5765,18 @@ class HistogramTypeJni {
         return ROCKSDB_NAMESPACE::Histograms::FILE_READ_COMPACTION_MICROS;
       case 0x3C:
         return ROCKSDB_NAMESPACE::Histograms::FILE_READ_DB_OPEN_MICROS;
+      case 0x3D:
+        return ROCKSDB_NAMESPACE::Histograms::FILE_READ_GET_MICROS;
+      case 0x3E:
+        return ROCKSDB_NAMESPACE::Histograms::FILE_READ_MULTIGET_MICROS;
+      case 0x3F:
+        return ROCKSDB_NAMESPACE::Histograms::FILE_READ_DB_ITERATOR_MICROS;
+      case 0x40:
+        return ROCKSDB_NAMESPACE::Histograms::
+            FILE_READ_VERIFY_DB_CHECKSUM_MICROS;
+      case 0x41:
+        return ROCKSDB_NAMESPACE::Histograms::
+            FILE_READ_VERIFY_FILE_CHECKSUMS_MICROS;
       case 0x1F:
         // 0x1F for backwards compatibility on current minor version.
         return ROCKSDB_NAMESPACE::Histograms::HISTOGRAM_ENUM_MAX;

java/src/main/java/org/rocksdb/HistogramType.java

@@ -175,6 +175,16 @@ public enum HistogramType {
 
   FILE_READ_DB_OPEN_MICROS((byte) 0x3C),
 
+  FILE_READ_GET_MICROS((byte) 0x3D),
+
+  FILE_READ_MULTIGET_MICROS((byte) 0x3E),
+
+  FILE_READ_DB_ITERATOR_MICROS((byte) 0x3F),
+
+  FILE_READ_VERIFY_DB_CHECKSUM_MICROS((byte) 0x40),
+
+  FILE_READ_VERIFY_FILE_CHECKSUMS_MICROS((byte) 0x41),
+
   // 0x1F for backwards compatibility on current minor version.
   HISTOGRAM_ENUM_MAX((byte) 0x1F);
 

microbench/db_basic_bench.cc

@@ -1555,8 +1555,7 @@ static void RandomAccessFileReaderRead(benchmark::State& state) {
   uint64_t idx = 0;
   for (auto _ : state) {
     s = readers[idx++ % kFileNum]->Read(io_options, 0, kDefaultPageSize / 3,
-                                        &result, scratch.get(), nullptr,
+                                        &result, scratch.get(), nullptr);
-                                        Env::IO_TOTAL);
     if (!s.ok()) {
       state.SkipWithError(s.ToString().c_str());
     }

monitoring/statistics.cc

@@ -281,6 +281,13 @@ const std::vector<std::pair<Histograms, std::string>> HistogramsNameMap = {
     {FILE_READ_FLUSH_MICROS, "rocksdb.file.read.flush.micros"},
     {FILE_READ_COMPACTION_MICROS, "rocksdb.file.read.compaction.micros"},
     {FILE_READ_DB_OPEN_MICROS, "rocksdb.file.read.db.open.micros"},
+    {FILE_READ_GET_MICROS, "rocksdb.file.read.get.micros"},
+    {FILE_READ_MULTIGET_MICROS, "rocksdb.file.read.multiget.micros"},
+    {FILE_READ_DB_ITERATOR_MICROS, "rocksdb.file.read.db.iterator.micros"},
+    {FILE_READ_VERIFY_DB_CHECKSUM_MICROS,
+     "rocksdb.file.read.verify.db.checksum.micros"},
+    {FILE_READ_VERIFY_FILE_CHECKSUMS_MICROS,
+     "rocksdb.file.read.verify.file.checksums.micros"},
     {NUM_SUBCOMPACTIONS_SCHEDULED, "rocksdb.num.subcompactions.scheduled"},
     {BYTES_PER_READ, "rocksdb.bytes.per.read"},
     {BYTES_PER_WRITE, "rocksdb.bytes.per.write"},

monitoring/thread_status_util_debug.cc

@@ -36,6 +36,16 @@ Env::IOActivity ThreadStatusUtil::TEST_GetExpectedIOActivity(
       return Env::IOActivity::kCompaction;
     case ThreadStatus::OperationType::OP_DBOPEN:
       return Env::IOActivity::kDBOpen;
+    case ThreadStatus::OperationType::OP_GET:
+      return Env::IOActivity::kGet;
+    case ThreadStatus::OperationType::OP_MULTIGET:
+      return Env::IOActivity::kMultiGet;
+    case ThreadStatus::OperationType::OP_DBITERATOR:
+      return Env::IOActivity::kDBIterator;
+    case ThreadStatus::OperationType::OP_VERIFY_DB_CHECKSUM:
+      return Env::IOActivity::kVerifyDBChecksum;
+    case ThreadStatus::OperationType::OP_VERIFY_FILE_CHECKSUMS:
+      return Env::IOActivity::kVerifyFileChecksums;
     default:
       return Env::IOActivity::kUnknown;
   }

table/block_based/block_based_table_iterator.cc

@@ -281,7 +281,7 @@ void BlockBasedTableIterator::InitDataBlock() {
     //   Enabled from the very first IO when ReadOptions.readahead_size is set.
     block_prefetcher_.PrefetchIfNeeded(
         rep, data_block_handle, read_options_.readahead_size, is_for_compaction,
-        /*no_sequential_checking=*/false, read_options_.rate_limiter_priority);
+        /*no_sequential_checking=*/false, read_options_);
     Status s;
     table_->NewDataBlockIterator<DataBlockIter>(
         read_options_, data_block_handle, &block_iter_, BlockType::kData,
@@ -326,7 +326,7 @@ void BlockBasedTableIterator::AsyncInitDataBlock(bool is_first_pass) {
       block_prefetcher_.PrefetchIfNeeded(
           rep, data_block_handle, read_options_.readahead_size,
           is_for_compaction, /*no_sequential_checking=*/read_options_.async_io,
-          read_options_.rate_limiter_priority);
+          read_options_);
 
       Status s;
       table_->NewDataBlockIterator<DataBlockIter>(

table/block_based/block_based_table_reader.cc

@@ -860,10 +860,11 @@ Status BlockBasedTable::PrefetchTail(
                            &prefetch_off_len_pair);
 #endif  // NDEBUG
 
+  IOOptions opts;
+  Status s = file->PrepareIOOptions(ro, opts);
   // Try file system prefetch
-  if (!file->use_direct_io() && !force_direct_prefetch) {
+  if (s.ok() && !file->use_direct_io() && !force_direct_prefetch) {
-    if (!file->Prefetch(prefetch_off, prefetch_len, ro.rate_limiter_priority)
+    if (!file->Prefetch(opts, prefetch_off, prefetch_len).IsNotSupported()) {
-             .IsNotSupported()) {
       prefetch_buffer->reset(new FilePrefetchBuffer(
           0 /* readahead_size */, 0 /* max_readahead_size */,
           false /* enable */, true /* track_min_offset */));
@@ -879,12 +880,8 @@ Status BlockBasedTable::PrefetchTail(
       nullptr /* fs */, nullptr /* clock */, stats,
       FilePrefetchBufferUsage::kTableOpenPrefetchTail));
 
-  IOOptions opts;
-  Status s = file->PrepareIOOptions(ro, opts);
   if (s.ok()) {
-    s = (*prefetch_buffer)
+    s = (*prefetch_buffer)->Prefetch(opts, file, prefetch_off, prefetch_len);
-            ->Prefetch(opts, file, prefetch_off, prefetch_len,
-                       ro.rate_limiter_priority);
   }
   return s;
 }

table/block_based/block_based_table_reader_sync_and_async.h

@@ -144,7 +144,7 @@ DEFINE_SYNC_AND_ASYNC(void, BlockBasedTable::RetrieveMultipleBlocks)
       if (file->use_direct_io()) {
 #endif  // WITH_COROUTINES
         s = file->MultiRead(opts, &read_reqs[0], read_reqs.size(),
-                            &direct_io_buf, options.rate_limiter_priority);
+                            &direct_io_buf);
 #if defined(WITH_COROUTINES)
       } else {
         co_await batch->context()->reader().MultiReadAsync(

table/block_based/block_prefetcher.cc

@@ -12,11 +12,12 @@
 #include "table/block_based/block_based_table_reader.h"
 
 namespace ROCKSDB_NAMESPACE {
-void BlockPrefetcher::PrefetchIfNeeded(
+void BlockPrefetcher::PrefetchIfNeeded(const BlockBasedTable::Rep* rep,
-    const BlockBasedTable::Rep* rep, const BlockHandle& handle,
+                                       const BlockHandle& handle,
-    const size_t readahead_size, bool is_for_compaction,
+                                       const size_t readahead_size,
-    const bool no_sequential_checking,
+                                       bool is_for_compaction,
-    const Env::IOPriority rate_limiter_priority) {
+                                       const bool no_sequential_checking,
+                                       const ReadOptions& read_options) {
   const size_t len = BlockBasedTable::BlockSizeWithTrailer(handle);
   const size_t offset = handle.offset();
 
@@ -27,8 +28,12 @@ void BlockPrefetcher::PrefetchIfNeeded(
       if (offset + len <= readahead_limit_) {
         return;
       }
-      Status s = rep->file->Prefetch(offset, len + compaction_readahead_size_,
+      IOOptions opts;
-                                     rate_limiter_priority);
+      Status s = rep->file->PrepareIOOptions(read_options, opts);
+      if (!s.ok()) {
+        return;
+      }
+      s = rep->file->Prefetch(opts, offset, len + compaction_readahead_size_);
       if (s.ok()) {
         readahead_limit_ = offset + len + compaction_readahead_size_;
         return;
@@ -117,10 +122,14 @@ void BlockPrefetcher::PrefetchIfNeeded(
   // If prefetch is not supported, fall back to use internal prefetch buffer.
   // Discarding other return status of Prefetch calls intentionally, as
   // we can fallback to reading from disk if Prefetch fails.
-  Status s = rep->file->Prefetch(
+  IOOptions opts;
-      handle.offset(),
+  Status s = rep->file->PrepareIOOptions(read_options, opts);
-      BlockBasedTable::BlockSizeWithTrailer(handle) + readahead_size_,
+  if (!s.ok()) {
-      rate_limiter_priority);
+    return;
+  }
+  s = rep->file->Prefetch(
+      opts, handle.offset(),
+      BlockBasedTable::BlockSizeWithTrailer(handle) + readahead_size_);
   if (s.IsNotSupported()) {
     rep->CreateFilePrefetchBufferIfNotExists(
         initial_auto_readahead_size_, max_auto_readahead_size,

table/block_based/block_prefetcher.h

@@ -22,7 +22,7 @@ class BlockPrefetcher {
                         const BlockHandle& handle, size_t readahead_size,
                         bool is_for_compaction,
                         const bool no_sequential_checking,
-                        Env::IOPriority rate_limiter_priority);
+                        const ReadOptions& read_options);
   FilePrefetchBuffer* prefetch_buffer() { return prefetch_buffer_.get(); }
 
   void UpdateReadPattern(const uint64_t& offset, const size_t& len) {

table/block_based/partitioned_filter_block.cc

@@ -503,8 +503,7 @@ Status PartitionedFilterBlockReader::CacheDependencies(
     s = rep->file->PrepareIOOptions(ro, opts);
     if (s.ok()) {
       s = prefetch_buffer->Prefetch(opts, rep->file.get(), prefetch_off,
-                                    static_cast<size_t>(prefetch_len),
+                                    static_cast<size_t>(prefetch_len));
-                                    ro.rate_limiter_priority);
     }
     if (!s.ok()) {
       return s;

table/block_based/partitioned_index_iterator.cc

@@ -91,8 +91,7 @@ void PartitionedIndexIterator::InitPartitionedIndexBlock() {
     //   Enabled from the very first IO when ReadOptions.readahead_size is set.
     block_prefetcher_.PrefetchIfNeeded(
         rep, partitioned_index_handle, read_options_.readahead_size,
-        is_for_compaction, /*no_sequential_checking=*/false,
+        is_for_compaction, /*no_sequential_checking=*/false, read_options_);
-        read_options_.rate_limiter_priority);
     Status s;
     table_->NewDataBlockIterator<IndexBlockIter>(
         read_options_, partitioned_index_handle, &block_iter_,

table/block_based/partitioned_index_reader.cc

@@ -175,8 +175,7 @@ Status PartitionIndexReader::CacheDependencies(
       Status s = rep->file->PrepareIOOptions(ro, opts);
       if (s.ok()) {
         s = prefetch_buffer->Prefetch(opts, rep->file.get(), prefetch_off,
-                                      static_cast<size_t>(prefetch_len),
+                                      static_cast<size_t>(prefetch_len));
-                                      ro.rate_limiter_priority);
       }
       if (!s.ok()) {
         return s;

table/block_fetcher.cc

@@ -80,11 +80,11 @@ inline bool BlockFetcher::TryGetFromPrefetchBuffer() {
       if (read_options_.async_io && !for_compaction_) {
         read_from_prefetch_buffer = prefetch_buffer_->TryReadFromCacheAsync(
             opts, file_, handle_.offset(), block_size_with_trailer_, &slice_,
-            &io_s, read_options_.rate_limiter_priority);
+            &io_s);
       } else {
         read_from_prefetch_buffer = prefetch_buffer_->TryReadFromCache(
             opts, file_, handle_.offset(), block_size_with_trailer_, &slice_,
-            &io_s, read_options_.rate_limiter_priority, for_compaction_);
+            &io_s, for_compaction_);
       }
       if (read_from_prefetch_buffer) {
         ProcessTrailerIfPresent();
@@ -259,18 +259,18 @@ IOStatus BlockFetcher::ReadBlockContents() {
       if (file_->use_direct_io()) {
         PERF_TIMER_GUARD(block_read_time);
         PERF_CPU_TIMER_GUARD(block_read_cpu_time, nullptr);
-        io_status_ = file_->Read(
+        io_status_ =
-            opts, handle_.offset(), block_size_with_trailer_, &slice_, nullptr,
+            file_->Read(opts, handle_.offset(), block_size_with_trailer_,
-            &direct_io_buf_, read_options_.rate_limiter_priority);
+                        &slice_, nullptr, &direct_io_buf_);
         PERF_COUNTER_ADD(block_read_count, 1);
         used_buf_ = const_cast<char*>(slice_.data());
       } else {
         PrepareBufferForBlockFromFile();
         PERF_TIMER_GUARD(block_read_time);
         PERF_CPU_TIMER_GUARD(block_read_cpu_time, nullptr);
-        io_status_ = file_->Read(opts, handle_.offset(),
+        io_status_ =
-                                 block_size_with_trailer_, &slice_, used_buf_,
+            file_->Read(opts, handle_.offset(), block_size_with_trailer_,
-                                 nullptr, read_options_.rate_limiter_priority);
+                        &slice_, used_buf_, nullptr);
         PERF_COUNTER_ADD(block_read_count, 1);
 #ifndef NDEBUG
         if (slice_.data() == &stack_buf_[0]) {

table/cuckoo/cuckoo_table_builder_test.cc

@@ -122,8 +122,7 @@ class CuckooBuilderTest : public testing::Test {
     for (uint32_t i = 0; i + 1 < table_size + cuckoo_block_size; ++i) {
       Slice read_slice;
       ASSERT_OK(file_reader->Read(IOOptions(), i * bucket_size, bucket_size,
-                                  &read_slice, nullptr, nullptr,
+                                  &read_slice, nullptr, nullptr));
-                                  Env::IO_TOTAL /* rate_limiter_priority */));
       size_t key_idx =
           std::find(expected_locations.begin(), expected_locations.end(), i) -
           expected_locations.begin();

table/cuckoo/cuckoo_table_reader.cc

@@ -144,9 +144,8 @@ CuckooTableReader::CuckooTableReader(
       *reinterpret_cast<const uint32_t*>(cuckoo_block_size->second.data());
   cuckoo_block_bytes_minus_one_ = cuckoo_block_size_ * bucket_length_ - 1;
   // TODO: rate limit reads of whole cuckoo tables.
-  status_ =
+  status_ = file_->Read(IOOptions(), 0, static_cast<size_t>(file_size),
-      file_->Read(IOOptions(), 0, static_cast<size_t>(file_size), &file_data_,
+                        &file_data_, nullptr, nullptr);
-                  nullptr, nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
 }
 
 Status CuckooTableReader::Get(const ReadOptions& /*readOptions*/,

table/format.cc

@@ -509,18 +509,16 @@ Status ReadFooterFromFile(const IOOptions& opts, RandomAccessFileReader* file,
   // need to pass a timeout at that point
   // TODO: rate limit footer reads.
   if (prefetch_buffer == nullptr ||
-      !prefetch_buffer->TryReadFromCache(
+      !prefetch_buffer->TryReadFromCache(opts, file, read_offset,
-          opts, file, read_offset, Footer::kMaxEncodedLength, &footer_input,
+                                         Footer::kMaxEncodedLength,
-          nullptr, opts.rate_limiter_priority)) {
+                                         &footer_input, nullptr)) {
     if (file->use_direct_io()) {
       s = file->Read(opts, read_offset, Footer::kMaxEncodedLength,
-                     &footer_input, nullptr, &internal_buf,
+                     &footer_input, nullptr, &internal_buf);
-                     opts.rate_limiter_priority);
     } else {
       footer_buf.reserve(Footer::kMaxEncodedLength);
       s = file->Read(opts, read_offset, Footer::kMaxEncodedLength,
-                     &footer_input, &footer_buf[0], nullptr,
+                     &footer_input, &footer_buf[0], nullptr);
-                     opts.rate_limiter_priority);
     }
     if (!s.ok()) return s;
   }

table/mock_table.cc

@@ -305,8 +305,7 @@ Status MockTableFactory::GetIDFromFile(RandomAccessFileReader* file,
                                        uint32_t* id) const {
   char buf[4];
   Slice result;
-  Status s = file->Read(IOOptions(), 0, 4, &result, buf, nullptr,
+  Status s = file->Read(IOOptions(), 0, 4, &result, buf, nullptr);
-                        Env::IO_TOTAL /* rate_limiter_priority */);
   assert(result.size() == 4);
   *id = DecodeFixed32(buf);
   return s;

table/plain/plain_table_key_coding.cc

@@ -215,8 +215,7 @@ bool PlainTableFileReader::ReadNonMmap(uint32_t file_offset, uint32_t len,
   // TODO: rate limit plain table reads.
   Status s =
       file_info_->file->Read(IOOptions(), file_offset, size_to_read,
-                             &read_result, new_buffer->buf.get(), nullptr,
+                             &read_result, new_buffer->buf.get(), nullptr);
-                             Env::IO_TOTAL /* rate_limiter_priority */);
   if (!s.ok()) {
     status_ = s;
     return false;

table/plain/plain_table_reader.cc

@@ -284,9 +284,9 @@ void PlainTableReader::FillBloom(const std::vector<uint32_t>& prefix_hashes) {
 Status PlainTableReader::MmapDataIfNeeded() {
   if (file_info_.is_mmap_mode) {
     // Get mmapped memory.
-    return file_info_.file->Read(
+    return file_info_.file->Read(IOOptions(), 0,
-        IOOptions(), 0, static_cast<size_t>(file_size_), &file_info_.file_data,
+                                 static_cast<size_t>(file_size_),
-        nullptr, nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
+                                 &file_info_.file_data, nullptr, nullptr);
   }
   return Status::OK();
 }

table/sst_file_dumper.cc

@@ -109,8 +109,7 @@ Status SstFileDumper::GetTableReader(const std::string& file_path) {
     uint64_t prefetch_off = file_size - prefetch_size;
     IOOptions opts;
     s = prefetch_buffer.Prefetch(opts, file_.get(), prefetch_off,
-                                 static_cast<size_t>(prefetch_size),
+                                 static_cast<size_t>(prefetch_size));
-                                 Env::IO_TOTAL /* rate_limiter_priority */);
 
     s = ReadFooterFromFile(opts, file_.get(), *fs, &prefetch_buffer, file_size,
                            &footer);

table/table_test.cc

@@ -1330,7 +1330,7 @@ class FileChecksumTestHelper {
     uint64_t offset = 0;
     Status s;
     s = file_reader_->Read(IOOptions(), offset, 2048, &result, scratch.get(),
-                           nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
+                           nullptr);
     if (!s.ok()) {
       return s;
     }
@@ -1338,8 +1338,7 @@ class FileChecksumTestHelper {
       file_checksum_generator->Update(scratch.get(), result.size());
       offset += static_cast<uint64_t>(result.size());
       s = file_reader_->Read(IOOptions(), offset, 2048, &result, scratch.get(),
-                             nullptr,
+                             nullptr);
-                             Env::IO_TOTAL /* rate_limiter_priority */);
       if (!s.ok()) {
         return s;
       }
@@ -5396,16 +5395,13 @@ TEST_F(BBTTailPrefetchTest, FilePrefetchBufferMinOffset) {
   IOOptions opts;
   buffer.TryReadFromCache(opts, nullptr /* reader */, 500 /* offset */,
                           10 /* n */, nullptr /* result */,
-                          nullptr /* status */,
+                          nullptr /* status */);
-                          Env::IO_TOTAL /* rate_limiter_priority */);
   buffer.TryReadFromCache(opts, nullptr /* reader */, 480 /* offset */,
                           10 /* n */, nullptr /* result */,
-                          nullptr /* status */,
+                          nullptr /* status */);
-                          Env::IO_TOTAL /* rate_limiter_priority */);
   buffer.TryReadFromCache(opts, nullptr /* reader */, 490 /* offset */,
                           10 /* n */, nullptr /* result */,
-                          nullptr /* status */,
+                          nullptr /* status */);
-                          Env::IO_TOTAL /* rate_limiter_priority */);
   ASSERT_EQ(480, buffer.min_offset_read());
 }
 

tools/db_crashtest.py

@@ -169,6 +169,7 @@ default_params = {
     ),
     "level_compaction_dynamic_level_bytes": lambda: random.randint(0, 1),
     "verify_checksum_one_in": 1000000,
+    "verify_file_checksums_one_in": 1000000,
     "verify_db_one_in": 100000,
     "continuous_verification_interval": 0,
     "max_key_len": 3,
@@ -658,6 +659,8 @@ def finalize_and_sanitize(src_params):
         dest_params["ingest_external_file_one_in"] = 0
         dest_params["use_merge"] = 0
         dest_params["use_full_merge_v1"] = 0
+    if dest_params["file_checksum_impl"] == "none":
+        dest_params["verify_file_checksums_one_in"] = 0
 
     return dest_params
 

unreleased_history/behavior_changes/more_sst_read_micros.md

@@ -0,0 +1 @@
+Statistics `rocksdb.sst.read.micros` now includes time spent on multi read and async read into the file

unreleased_history/new_features/user_read_io_activity_stats.md

@@ -0,0 +1 @@
+New statistics `rocksdb.file.read.{db.open|get|multiget|db.iterator|verify.checksum|verify.file.checksums}.micros` measure read time of block-based SST tables or blob files during db open, `Get()`, `MultiGet()`, using db iterator, `VerifyFileChecksums()` and `VerifyChecksum()`. They require stats level greater than `StatsLevel::kExceptDetailedTimers`.

util/thread_operation.h

@@ -39,7 +39,14 @@ static OperationInfo global_operation_table[] = {
     {ThreadStatus::OP_UNKNOWN, ""},
     {ThreadStatus::OP_COMPACTION, "Compaction"},
     {ThreadStatus::OP_FLUSH, "Flush"},
-    {ThreadStatus::OP_DBOPEN, "DBOpen"}};
+    {ThreadStatus::OP_DBOPEN, "DBOpen"},
+    {ThreadStatus::OP_GET, "Get"},
+    {ThreadStatus::OP_MULTIGET, "MultiGet"},
+    {ThreadStatus::OP_DBITERATOR, "DBIterator"},
+    {ThreadStatus::OP_VERIFY_DB_CHECKSUM, "VerifyDBChecksum"},
+    {ThreadStatus::OP_VERIFY_FILE_CHECKSUMS, "VerifyFileChecksums"},
+
+};
 
 struct OperationStageInfo {
   const ThreadStatus::OperationStage stage;

utilities/blob_db/blob_db_impl.cc

@@ -1384,28 +1384,46 @@ Status BlobDBImpl::AppendBlob(const std::shared_ptr<BlobFile>& bfile,
   return s;
 }
 
-std::vector<Status> BlobDBImpl::MultiGet(const ReadOptions& read_options,
+std::vector<Status> BlobDBImpl::MultiGet(const ReadOptions& _read_options,
                                          const std::vector<Slice>& keys,
                                          std::vector<std::string>* values) {
   StopWatch multiget_sw(clock_, statistics_, BLOB_DB_MULTIGET_MICROS);
   RecordTick(statistics_, BLOB_DB_NUM_MULTIGET);
   // Get a snapshot to avoid blob file get deleted between we
   // fetch and index entry and reading from the file.
-  ReadOptions ro(read_options);
-  bool snapshot_created = SetSnapshotIfNeeded(&ro);
-
   std::vector<Status> statuses;
-  statuses.reserve(keys.size());
+  std::size_t num_keys = keys.size();
+  statuses.reserve(num_keys);
+
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+
+    for (size_t i = 0; i < num_keys; ++i) {
+      statuses.push_back(s);
+    }
+    return statuses;
+  }
+
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
+  bool snapshot_created = SetSnapshotIfNeeded(&read_options);
+
   values->clear();
   values->reserve(keys.size());
   PinnableSlice value;
   for (size_t i = 0; i < keys.size(); i++) {
-    statuses.push_back(Get(ro, DefaultColumnFamily(), keys[i], &value));
+    statuses.push_back(
+        GetImpl(read_options, DefaultColumnFamily(), keys[i], &value));
     values->push_back(value.ToString());
     value.Reset();
   }
   if (snapshot_created) {
-    db_->ReleaseSnapshot(ro.snapshot);
+    db_->ReleaseSnapshot(read_options.snapshot);
   }
   return statuses;
 }
@@ -1544,12 +1562,12 @@ Status BlobDBImpl::GetRawBlobFromFile(const Slice& key, uint64_t file_number,
     if (reader->use_direct_io()) {
       s = reader->Read(IOOptions(), record_offset,
                        static_cast<size_t>(record_size), &blob_record, nullptr,
-                       &aligned_buf, Env::IO_TOTAL /* rate_limiter_priority */);
+                       &aligned_buf);
     } else {
       buf.reserve(static_cast<size_t>(record_size));
       s = reader->Read(IOOptions(), record_offset,
                        static_cast<size_t>(record_size), &blob_record, &buf[0],
-                       nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
+                       nullptr);
     }
     RecordTick(statistics_, BLOB_DB_BLOB_FILE_BYTES_READ, blob_record.size());
   }
@@ -1609,16 +1627,36 @@ Status BlobDBImpl::GetRawBlobFromFile(const Slice& key, uint64_t file_number,
   return Status::OK();
 }
 
-Status BlobDBImpl::Get(const ReadOptions& read_options,
+Status BlobDBImpl::Get(const ReadOptions& _read_options,
                        ColumnFamilyHandle* column_family, const Slice& key,
                        PinnableSlice* value) {
-  return Get(read_options, column_family, key, value,
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
-             static_cast<uint64_t*>(nullptr) /*expiration*/);
+      _read_options.io_activity != Env::IOActivity::kGet) {
+    return Status::InvalidArgument(
+        "Can only call Get with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+  return GetImpl(read_options, column_family, key, value);
 }
 
-Status BlobDBImpl::Get(const ReadOptions& read_options,
+Status BlobDBImpl::Get(const ReadOptions& _read_options,
                        ColumnFamilyHandle* column_family, const Slice& key,
                        PinnableSlice* value, uint64_t* expiration) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
+    return Status::InvalidArgument(
+        "Can only call Get with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+
   StopWatch get_sw(clock_, statistics_, BLOB_DB_GET_MICROS);
   RecordTick(statistics_, BLOB_DB_NUM_GET);
   return GetImpl(read_options, column_family, key, value, expiration);
@@ -1631,11 +1669,6 @@ Status BlobDBImpl::GetImpl(const ReadOptions& read_options,
     return Status::NotSupported(
         "Blob DB doesn't support non-default column family.");
   }
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
-    return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
-        "`Env::IOActivity::kUnknown`");
-  }
   // Get a snapshot to avoid blob file get deleted between we
   // fetch and index entry and reading from the file.
   // TODO(yiwu): For Get() retry if file not found would be a simpler strategy.
@@ -2040,11 +2073,16 @@ void BlobDBImpl::CopyBlobFiles(
   }
 }
 
-Iterator* BlobDBImpl::NewIterator(const ReadOptions& read_options) {
+Iterator* BlobDBImpl::NewIterator(const ReadOptions& _read_options) {
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
     return NewErrorIterator(Status::InvalidArgument(
-        "Cannot call NewIterator with `ReadOptions::io_activity` != "
+        "Can only call NewIterator with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`"));
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`"));
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
   }
   auto* cfd =
       static_cast_with_check<ColumnFamilyHandleImpl>(DefaultColumnFamily())

utilities/blob_db/blob_db_impl.h

@@ -103,12 +103,13 @@ class BlobDBImpl : public BlobDB {
              const Slice& value) override;
 
   using BlobDB::Get;
-  Status Get(const ReadOptions& read_options, ColumnFamilyHandle* column_family,
+  Status Get(const ReadOptions& _read_options,
-             const Slice& key, PinnableSlice* value) override;
+             ColumnFamilyHandle* column_family, const Slice& key,
+             PinnableSlice* value) override;
 
-  Status Get(const ReadOptions& read_options, ColumnFamilyHandle* column_family,
+  Status Get(const ReadOptions& _read_options,
-             const Slice& key, PinnableSlice* value,
+             ColumnFamilyHandle* column_family, const Slice& key,
-             uint64_t* expiration) override;
+             PinnableSlice* value, uint64_t* expiration) override;
 
   using BlobDB::NewIterator;
   virtual Iterator* NewIterator(const ReadOptions& read_options) override;
@@ -123,7 +124,7 @@ class BlobDBImpl : public BlobDB {
 
   using BlobDB::MultiGet;
   virtual std::vector<Status> MultiGet(
-      const ReadOptions& read_options, const std::vector<Slice>& keys,
+      const ReadOptions& _read_options, const std::vector<Slice>& keys,
       std::vector<std::string>* values) override;
 
   using BlobDB::Write;

utilities/blob_db/blob_dump_tool.cc

@@ -102,8 +102,8 @@ Status BlobDumpTool::Read(uint64_t offset, size_t size, Slice* result) {
     }
     buffer_.reset(new char[buffer_size_]);
   }
-  Status s = reader_->Read(IOOptions(), offset, size, result, buffer_.get(),
+  Status s =
-                           nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
+      reader_->Read(IOOptions(), offset, size, result, buffer_.get(), nullptr);
   if (!s.ok()) {
     return s;
   }
@@ -277,4 +277,3 @@ std::string BlobDumpTool::GetString(std::pair<T, T> p) {
 
 }  // namespace blob_db
 }  // namespace ROCKSDB_NAMESPACE
-

utilities/blob_db/blob_file.cc

@@ -114,13 +114,11 @@ Status BlobFile::ReadFooter(BlobLogFooter* bf) {
   // TODO: rate limit reading footers from blob files.
   if (ra_file_reader_->use_direct_io()) {
     s = ra_file_reader_->Read(IOOptions(), footer_offset, BlobLogFooter::kSize,
-                              &result, nullptr, &aligned_buf,
+                              &result, nullptr, &aligned_buf);
-                              Env::IO_TOTAL /* rate_limiter_priority */);
   } else {
     buf.reserve(BlobLogFooter::kSize + 10);
     s = ra_file_reader_->Read(IOOptions(), footer_offset, BlobLogFooter::kSize,
-                              &result, &buf[0], nullptr,
+                              &result, &buf[0], nullptr);
-                              Env::IO_TOTAL /* rate_limiter_priority */);
   }
   if (!s.ok()) return s;
   if (result.size() != BlobLogFooter::kSize) {
@@ -238,13 +236,11 @@ Status BlobFile::ReadMetadata(const std::shared_ptr<FileSystem>& fs,
   // TODO: rate limit reading headers from blob files.
   if (file_reader->use_direct_io()) {
     s = file_reader->Read(IOOptions(), 0, BlobLogHeader::kSize, &header_slice,
-                          nullptr, &aligned_buf,
+                          nullptr, &aligned_buf);
-                          Env::IO_TOTAL /* rate_limiter_priority */);
   } else {
     header_buf.reserve(BlobLogHeader::kSize);
     s = file_reader->Read(IOOptions(), 0, BlobLogHeader::kSize, &header_slice,
-                          &header_buf[0], nullptr,
+                          &header_buf[0], nullptr);
-                          Env::IO_TOTAL /* rate_limiter_priority */);
   }
   if (!s.ok()) {
     ROCKS_LOG_ERROR(
@@ -281,13 +277,12 @@ Status BlobFile::ReadMetadata(const std::shared_ptr<FileSystem>& fs,
   if (file_reader->use_direct_io()) {
     s = file_reader->Read(IOOptions(), file_size - BlobLogFooter::kSize,
                           BlobLogFooter::kSize, &footer_slice, nullptr,
-                          &aligned_buf,
+                          &aligned_buf);
-                          Env::IO_TOTAL /* rate_limiter_priority */);
   } else {
     footer_buf.reserve(BlobLogFooter::kSize);
     s = file_reader->Read(IOOptions(), file_size - BlobLogFooter::kSize,
                           BlobLogFooter::kSize, &footer_slice, &footer_buf[0],
-                          nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
+                          nullptr);
   }
   if (!s.ok()) {
     ROCKS_LOG_ERROR(

utilities/cache_dump_load_impl.h

@@ -249,8 +249,7 @@ class FromFileCacheDumpReader : public CacheDumpReader {
 
     while (to_read > 0) {
       io_s = file_reader_->Read(IOOptions(), offset_, to_read, &result_,
-                                buffer_, nullptr,
+                                buffer_, nullptr);
-                                Env::IO_TOTAL /* rate_limiter_priority */);
       if (!io_s.ok()) {
         return io_s;
       }

utilities/persistent_cache/block_cache_tier_file.cc

@@ -236,7 +236,7 @@ bool RandomAccessCacheFile::Read(const LBA& lba, Slice* key, Slice* val,
 
   Slice result;
   Status s = freader_->Read(IOOptions(), lba.off_, lba.size_, &result, scratch,
-                            nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
+                            nullptr);
   if (!s.ok()) {
     Error(log_, "Error reading from file %s. %s", Path().c_str(),
           s.ToString().c_str());
@@ -605,4 +605,3 @@ void ThreadedWriter::DispatchIO(const IO& io) {
 }
 
 }  // namespace ROCKSDB_NAMESPACE
-

utilities/trace/file_trace_reader_writer.cc

@@ -42,8 +42,7 @@ Status FileTraceReader::Reset() {
 Status FileTraceReader::Read(std::string* data) {
   assert(file_reader_ != nullptr);
   Status s = file_reader_->Read(IOOptions(), offset_, kTraceMetadataSize,
-                                &result_, buffer_, nullptr,
+                                &result_, buffer_, nullptr);
-                                Env::IO_TOTAL /* rate_limiter_priority */);
   if (!s.ok()) {
     return s;
   }
@@ -68,7 +67,7 @@ Status FileTraceReader::Read(std::string* data) {
       bytes_to_read > kBufferSize ? kBufferSize : bytes_to_read;
   while (to_read > 0) {
     s = file_reader_->Read(IOOptions(), offset_, to_read, &result_, buffer_,
-                           nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
+                           nullptr);
     if (!s.ok()) {
       return s;
     }

utilities/transactions/transaction_base.cc

@@ -232,27 +232,56 @@ Status TransactionBaseImpl::PopSavePoint() {
   return write_batch_.PopSavePoint();
 }
 
-Status TransactionBaseImpl::Get(const ReadOptions& read_options,
+Status TransactionBaseImpl::Get(const ReadOptions& _read_options,
                                 ColumnFamilyHandle* column_family,
                                 const Slice& key, std::string* value) {
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
     return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
+        "Can only call Get with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`");
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
   }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+  auto s = GetImpl(read_options, column_family, key, value);
+  return s;
+}
+
+Status TransactionBaseImpl::GetImpl(const ReadOptions& read_options,
+                                    ColumnFamilyHandle* column_family,
+                                    const Slice& key, std::string* value) {
   assert(value != nullptr);
   PinnableSlice pinnable_val(value);
   assert(!pinnable_val.IsPinned());
-  auto s = Get(read_options, column_family, key, &pinnable_val);
+  auto s = GetImpl(read_options, column_family, key, &pinnable_val);
   if (s.ok() && pinnable_val.IsPinned()) {
     value->assign(pinnable_val.data(), pinnable_val.size());
   }  // else value is already assigned
   return s;
 }
 
-Status TransactionBaseImpl::Get(const ReadOptions& read_options,
+Status TransactionBaseImpl::Get(const ReadOptions& _read_options,
                                 ColumnFamilyHandle* column_family,
                                 const Slice& key, PinnableSlice* pinnable_val) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
+    return Status::InvalidArgument(
+        "Can only call Get with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+  return GetImpl(read_options, column_family, key, pinnable_val);
+}
+
+Status TransactionBaseImpl::GetImpl(const ReadOptions& read_options,
+                                    ColumnFamilyHandle* column_family,
+                                    const Slice& key,
+                                    PinnableSlice* pinnable_val) {
   return write_batch_.GetFromBatchAndDB(db_, read_options, column_family, key,
                                         pinnable_val);
 }
@@ -279,7 +308,7 @@ Status TransactionBaseImpl::GetForUpdate(const ReadOptions& read_options,
     assert(value != nullptr);
     PinnableSlice pinnable_val(value);
     assert(!pinnable_val.IsPinned());
-    s = Get(read_options, column_family, key, &pinnable_val);
+    s = GetImpl(read_options, column_family, key, &pinnable_val);
     if (s.ok() && pinnable_val.IsPinned()) {
       value->assign(pinnable_val.data(), pinnable_val.size());
     }  // else value is already assigned
@@ -307,39 +336,63 @@ Status TransactionBaseImpl::GetForUpdate(const ReadOptions& read_options,
       TryLock(column_family, key, true /* read_only */, exclusive, do_validate);
 
   if (s.ok() && pinnable_val != nullptr) {
-    s = Get(read_options, column_family, key, pinnable_val);
+    s = GetImpl(read_options, column_family, key, pinnable_val);
   }
   return s;
 }
 
 std::vector<Status> TransactionBaseImpl::MultiGet(
-    const ReadOptions& read_options,
+    const ReadOptions& _read_options,
     const std::vector<ColumnFamilyHandle*>& column_family,
     const std::vector<Slice>& keys, std::vector<std::string>* values) {
   size_t num_keys = keys.size();
-  if (read_options.io_activity != Env::IOActivity::kUnknown) {
+  std::vector<Status> stat_list(num_keys);
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
     Status s = Status::InvalidArgument(
-        "Cannot call MultiGet with `ReadOptions::io_activity` != "
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`");
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
-    return std::vector<Status>(num_keys, s);
+
+    for (size_t i = 0; i < num_keys; ++i) {
+      stat_list[i] = s;
+    }
+    return stat_list;
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
   }
 
   values->resize(num_keys);
-
-  std::vector<Status> stat_list(num_keys);
   for (size_t i = 0; i < num_keys; ++i) {
-    stat_list[i] = Get(read_options, column_family[i], keys[i], &(*values)[i]);
+    stat_list[i] =
+        GetImpl(read_options, column_family[i], keys[i], &(*values)[i]);
   }
 
   return stat_list;
 }
 
-void TransactionBaseImpl::MultiGet(const ReadOptions& read_options,
+void TransactionBaseImpl::MultiGet(const ReadOptions& _read_options,
                                    ColumnFamilyHandle* column_family,
                                    const size_t num_keys, const Slice* keys,
                                    PinnableSlice* values, Status* statuses,
                                    const bool sorted_input) {
-  assert(read_options.io_activity == Env::IOActivity::kUnknown);
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+    for (size_t i = 0; i < num_keys; ++i) {
+      if (statuses[i].ok()) {
+        statuses[i] = s;
+      }
+    }
+    return;
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
   write_batch_.MultiGetFromBatchAndDB(db_, read_options, column_family,
                                       num_keys, keys, values, statuses,
                                       sorted_input);
@@ -349,7 +402,6 @@ std::vector<Status> TransactionBaseImpl::MultiGetForUpdate(
     const ReadOptions& read_options,
     const std::vector<ColumnFamilyHandle*>& column_family,
     const std::vector<Slice>& keys, std::vector<std::string>* values) {
-  // Regardless of whether the MultiGet succeeded, track these keys.
   size_t num_keys = keys.size();
   if (read_options.io_activity != Env::IOActivity::kUnknown) {
     Status s = Status::InvalidArgument(
@@ -357,6 +409,7 @@ std::vector<Status> TransactionBaseImpl::MultiGetForUpdate(
         "`Env::IOActivity::kUnknown`");
     return std::vector<Status>(num_keys, s);
   }
+  // Regardless of whether the MultiGet succeeded, track these keys.
   values->resize(num_keys);
 
   // Lock all keys
@@ -372,7 +425,8 @@ std::vector<Status> TransactionBaseImpl::MultiGetForUpdate(
   // TODO(agiardullo): optimize multiget?
   std::vector<Status> stat_list(num_keys);
   for (size_t i = 0; i < num_keys; ++i) {
-    stat_list[i] = Get(read_options, column_family[i], keys[i], &(*values)[i]);
+    stat_list[i] =
+        GetImpl(read_options, column_family[i], keys[i], &(*values)[i]);
   }
 
   return stat_list;

utilities/transactions/transaction_base.h

@@ -53,11 +53,13 @@ class TransactionBaseImpl : public Transaction {
   Status PopSavePoint() override;
 
   using Transaction::Get;
-  Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
+  Status Get(const ReadOptions& _read_options,
-             const Slice& key, std::string* value) override;
+             ColumnFamilyHandle* column_family, const Slice& key,
+             std::string* value) override;
 
-  Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
+  Status Get(const ReadOptions& _read_options,
-             const Slice& key, PinnableSlice* value) override;
+             ColumnFamilyHandle* column_family, const Slice& key,
+             PinnableSlice* value) override;
 
   Status Get(const ReadOptions& options, const Slice& key,
              std::string* value) override {
@@ -84,7 +86,7 @@ class TransactionBaseImpl : public Transaction {
 
   using Transaction::MultiGet;
   std::vector<Status> MultiGet(
-      const ReadOptions& options,
+      const ReadOptions& _read_options,
       const std::vector<ColumnFamilyHandle*>& column_family,
       const std::vector<Slice>& keys,
       std::vector<std::string>* values) override;
@@ -98,9 +100,10 @@ class TransactionBaseImpl : public Transaction {
                     keys, values);
   }
 
-  void MultiGet(const ReadOptions& options, ColumnFamilyHandle* column_family,
+  void MultiGet(const ReadOptions& _read_options,
-                const size_t num_keys, const Slice* keys, PinnableSlice* values,
+                ColumnFamilyHandle* column_family, const size_t num_keys,
-                Status* statuses, const bool sorted_input = false) override;
+                const Slice* keys, PinnableSlice* values, Status* statuses,
+                const bool sorted_input = false) override;
 
   using Transaction::MultiGetForUpdate;
   std::vector<Status> MultiGetForUpdate(
@@ -260,6 +263,13 @@ class TransactionBaseImpl : public Transaction {
   LockTracker& GetTrackedLocks() { return *tracked_locks_; }
 
  protected:
+  Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
+                 const Slice& key, std::string* value) override;
+
+  virtual Status GetImpl(const ReadOptions& options,
+                         ColumnFamilyHandle* column_family, const Slice& key,
+                         PinnableSlice* value) override;
+
   // Add a key to the list of tracked keys.
   //
   // seqno is the earliest seqno this key was involved with this transaction.
@@ -379,4 +389,3 @@ class TransactionBaseImpl : public Transaction {
 };
 
 }  // namespace ROCKSDB_NAMESPACE
-

utilities/transactions/write_prepared_txn.cc

@@ -39,20 +39,37 @@ void WritePreparedTxn::Initialize(const TransactionOptions& txn_options) {
   prepare_batch_cnt_ = 0;
 }
 
-void WritePreparedTxn::MultiGet(const ReadOptions& options,
+void WritePreparedTxn::MultiGet(const ReadOptions& _read_options,
                                 ColumnFamilyHandle* column_family,
                                 const size_t num_keys, const Slice* keys,
                                 PinnableSlice* values, Status* statuses,
                                 const bool sorted_input) {
-  assert(options.io_activity == Env::IOActivity::kUnknown);
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+
+    for (size_t i = 0; i < num_keys; ++i) {
+      if (statuses[i].ok()) {
+        statuses[i] = s;
+      }
+    }
+    return;
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
+
   SequenceNumber min_uncommitted, snap_seq;
-  const SnapshotBackup backed_by_snapshot =
+  const SnapshotBackup backed_by_snapshot = wpt_db_->AssignMinMaxSeqs(
-      wpt_db_->AssignMinMaxSeqs(options.snapshot, &min_uncommitted, &snap_seq);
+      read_options.snapshot, &min_uncommitted, &snap_seq);
   WritePreparedTxnReadCallback callback(wpt_db_, snap_seq, min_uncommitted,
                                         backed_by_snapshot);
-  write_batch_.MultiGetFromBatchAndDB(db_, options, column_family, num_keys,
+  write_batch_.MultiGetFromBatchAndDB(db_, read_options, column_family,
-                                      keys, values, statuses, sorted_input,
+                                      num_keys, keys, values, statuses,
-                                      &callback);
+                                      sorted_input, &callback);
   if (UNLIKELY(!callback.valid() ||
                !wpt_db_->ValidateSnapshot(snap_seq, backed_by_snapshot))) {
     wpt_db_->WPRecordTick(TXN_GET_TRY_AGAIN);
@@ -62,14 +79,27 @@ void WritePreparedTxn::MultiGet(const ReadOptions& options,
   }
 }
 
-Status WritePreparedTxn::Get(const ReadOptions& options,
+Status WritePreparedTxn::Get(const ReadOptions& _read_options,
                              ColumnFamilyHandle* column_family,
                              const Slice& key, PinnableSlice* pinnable_val) {
-  if (options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
     return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
+        "Can only call Get with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`");
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
   }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+
+  return GetImpl(read_options, column_family, key, pinnable_val);
+}
+
+Status WritePreparedTxn::GetImpl(const ReadOptions& options,
+                                 ColumnFamilyHandle* column_family,
+                                 const Slice& key,
+                                 PinnableSlice* pinnable_val) {
   SequenceNumber min_uncommitted, snap_seq;
   const SnapshotBackup backed_by_snapshot =
       wpt_db_->AssignMinMaxSeqs(options.snapshot, &min_uncommitted, &snap_seq);

utilities/transactions/write_prepared_txn.h

@@ -51,12 +51,12 @@ class WritePreparedTxn : public PessimisticTransaction {
   // seq in the WAL that is also published, LastPublishedSequence, as opposed to
   // the last seq in the memtable.
   using Transaction::Get;
-  virtual Status Get(const ReadOptions& options,
+  virtual Status Get(const ReadOptions& _read_options,
                      ColumnFamilyHandle* column_family, const Slice& key,
                      PinnableSlice* value) override;
 
   using Transaction::MultiGet;
-  virtual void MultiGet(const ReadOptions& options,
+  virtual void MultiGet(const ReadOptions& _read_options,
                         ColumnFamilyHandle* column_family,
                         const size_t num_keys, const Slice* keys,
                         PinnableSlice* values, Status* statuses,
@@ -86,6 +86,10 @@ class WritePreparedTxn : public PessimisticTransaction {
   friend class WriteUnpreparedTxnDB;
   friend class WriteUnpreparedTxn;
 
+  using Transaction::GetImpl;
+  Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
+                 const Slice& key, PinnableSlice* value) override;
+
   Status PrepareInternal() override;
 
   Status CommitWithoutPrepareInternal() override;

utilities/transactions/write_prepared_txn_db.cc

@@ -247,14 +247,26 @@ Status WritePreparedTxnDB::WriteInternal(const WriteOptions& write_options_orig,
   return s;
 }
 
-Status WritePreparedTxnDB::Get(const ReadOptions& options,
+Status WritePreparedTxnDB::Get(const ReadOptions& _read_options,
                                ColumnFamilyHandle* column_family,
                                const Slice& key, PinnableSlice* value) {
-  if (options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
     return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
+        "Can only call Get with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`");
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
   }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+
+  return GetImpl(read_options, column_family, key, value);
+}
+
+Status WritePreparedTxnDB::GetImpl(const ReadOptions& options,
+                                   ColumnFamilyHandle* column_family,
+                                   const Slice& key, PinnableSlice* value) {
   SequenceNumber min_uncommitted, snap_seq;
   const SnapshotBackup backed_by_snapshot =
       AssignMinMaxSeqs(options.snapshot, &min_uncommitted, &snap_seq);
@@ -314,16 +326,35 @@ void WritePreparedTxnDB::UpdateCFComparatorMap(ColumnFamilyHandle* h) {
 }
 
 std::vector<Status> WritePreparedTxnDB::MultiGet(
-    const ReadOptions& options,
+    const ReadOptions& _read_options,
     const std::vector<ColumnFamilyHandle*>& column_family,
     const std::vector<Slice>& keys, std::vector<std::string>* values) {
   assert(values);
   size_t num_keys = keys.size();
+  std::vector<Status> stat_list(num_keys);
+
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+
+    for (size_t i = 0; i < num_keys; ++i) {
+      stat_list[i] = s;
+    }
+    return stat_list;
+  }
+
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
+
   values->resize(num_keys);
 
-  std::vector<Status> stat_list(num_keys);
   for (size_t i = 0; i < num_keys; ++i) {
-    stat_list[i] = this->Get(options, column_family[i], keys[i], &(*values)[i]);
+    stat_list[i] =
+        this->GetImpl(read_options, column_family[i], keys[i], &(*values)[i]);
   }
   return stat_list;
 }
@@ -346,22 +377,27 @@ static void CleanupWritePreparedTxnDBIterator(void* arg1, void* /*arg2*/) {
 }
 }  // anonymous namespace
 
-Iterator* WritePreparedTxnDB::NewIterator(const ReadOptions& options,
+Iterator* WritePreparedTxnDB::NewIterator(const ReadOptions& _read_options,
                                           ColumnFamilyHandle* column_family) {
-  if (options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
     return NewErrorIterator(Status::InvalidArgument(
-        "Cannot call NewIterator with `ReadOptions::io_activity` != "
+        "Can only call NewIterator with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`"));
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`"));
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
   }
   constexpr bool expose_blob_index = false;
   constexpr bool allow_refresh = false;
   std::shared_ptr<ManagedSnapshot> own_snapshot = nullptr;
   SequenceNumber snapshot_seq = kMaxSequenceNumber;
   SequenceNumber min_uncommitted = 0;
-  if (options.snapshot != nullptr) {
+  if (read_options.snapshot != nullptr) {
-    snapshot_seq = options.snapshot->GetSequenceNumber();
+    snapshot_seq = read_options.snapshot->GetSequenceNumber();
     min_uncommitted =
-        static_cast_with_check<const SnapshotImpl>(options.snapshot)
+        static_cast_with_check<const SnapshotImpl>(read_options.snapshot)
             ->min_uncommitted_;
   } else {
     auto* snapshot = GetSnapshot();
@@ -377,26 +413,37 @@ Iterator* WritePreparedTxnDB::NewIterator(const ReadOptions& options,
       static_cast_with_check<ColumnFamilyHandleImpl>(column_family)->cfd();
   auto* state =
       new IteratorState(this, snapshot_seq, own_snapshot, min_uncommitted);
-  auto* db_iter =
+  auto* db_iter = db_impl_->NewIteratorImpl(read_options, cfd, snapshot_seq,
-      db_impl_->NewIteratorImpl(options, cfd, snapshot_seq, &state->callback,
+                                            &state->callback, expose_blob_index,
-                                expose_blob_index, allow_refresh);
+                                            allow_refresh);
   db_iter->RegisterCleanup(CleanupWritePreparedTxnDBIterator, state, nullptr);
   return db_iter;
 }
 
 Status WritePreparedTxnDB::NewIterators(
-    const ReadOptions& options,
+    const ReadOptions& _read_options,
     const std::vector<ColumnFamilyHandle*>& column_families,
     std::vector<Iterator*>* iterators) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
+    return Status::InvalidArgument(
+        "Can only call NewIterator with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`");
+  }
+
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
+  }
   constexpr bool expose_blob_index = false;
   constexpr bool allow_refresh = false;
   std::shared_ptr<ManagedSnapshot> own_snapshot = nullptr;
   SequenceNumber snapshot_seq = kMaxSequenceNumber;
   SequenceNumber min_uncommitted = 0;
-  if (options.snapshot != nullptr) {
+  if (read_options.snapshot != nullptr) {
-    snapshot_seq = options.snapshot->GetSequenceNumber();
+    snapshot_seq = read_options.snapshot->GetSequenceNumber();
     min_uncommitted =
-        static_cast_with_check<const SnapshotImpl>(options.snapshot)
+        static_cast_with_check<const SnapshotImpl>(read_options.snapshot)
             ->min_uncommitted_;
   } else {
     auto* snapshot = GetSnapshot();
@@ -414,9 +461,9 @@ Status WritePreparedTxnDB::NewIterators(
         static_cast_with_check<ColumnFamilyHandleImpl>(column_family)->cfd();
     auto* state =
         new IteratorState(this, snapshot_seq, own_snapshot, min_uncommitted);
-    auto* db_iter =
+    auto* db_iter = db_impl_->NewIteratorImpl(read_options, cfd, snapshot_seq,
-        db_impl_->NewIteratorImpl(options, cfd, snapshot_seq, &state->callback,
+                                              &state->callback,
-                                  expose_blob_index, allow_refresh);
+                                              expose_blob_index, allow_refresh);
     db_iter->RegisterCleanup(CleanupWritePreparedTxnDBIterator, state, nullptr);
     iterators->push_back(db_iter);
   }

utilities/transactions/write_prepared_txn_db.h

@@ -83,24 +83,24 @@ class WritePreparedTxnDB : public PessimisticTransactionDB {
                        size_t batch_cnt, WritePreparedTxn* txn);
 
   using DB::Get;
-  virtual Status Get(const ReadOptions& options,
+  virtual Status Get(const ReadOptions& _read_options,
                      ColumnFamilyHandle* column_family, const Slice& key,
                      PinnableSlice* value) override;
 
   using DB::MultiGet;
   virtual std::vector<Status> MultiGet(
-      const ReadOptions& options,
+      const ReadOptions& _read_options,
       const std::vector<ColumnFamilyHandle*>& column_family,
       const std::vector<Slice>& keys,
       std::vector<std::string>* values) override;
 
   using DB::NewIterator;
-  virtual Iterator* NewIterator(const ReadOptions& options,
+  virtual Iterator* NewIterator(const ReadOptions& _read_options,
                                 ColumnFamilyHandle* column_family) override;
 
   using DB::NewIterators;
   virtual Status NewIterators(
-      const ReadOptions& options,
+      const ReadOptions& _read_options,
       const std::vector<ColumnFamilyHandle*>& column_families,
       std::vector<Iterator*>* iterators) override;
 
@@ -520,6 +520,21 @@ class WritePreparedTxnDB : public PessimisticTransactionDB {
     RecordTick(db_impl_->immutable_db_options_.statistics.get(), ticker_type);
   }
 
+  Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
+                 const Slice& key, std::string* value) {
+    assert(value != nullptr);
+    PinnableSlice pinnable_val(value);
+    assert(!pinnable_val.IsPinned());
+    auto s = GetImpl(options, column_family, key, &pinnable_val);
+    if (s.ok() && pinnable_val.IsPinned()) {
+      value->assign(pinnable_val.data(), pinnable_val.size());
+    }  // else value is already assigned
+    return s;
+  }
+
+  Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
+                 const Slice& key, PinnableSlice* value);
+
   // A heap with the amortized O(1) complexity for erase. It uses one extra heap
   // to keep track of erased entries that are not yet on top of the main heap.
   class PreparedHeap {

utilities/transactions/write_unprepared_txn.cc

@@ -943,20 +943,36 @@ Status WriteUnpreparedTxn::PopSavePoint() {
   return Status::NotFound();
 }
 
-void WriteUnpreparedTxn::MultiGet(const ReadOptions& options,
+void WriteUnpreparedTxn::MultiGet(const ReadOptions& _read_options,
                                   ColumnFamilyHandle* column_family,
                                   const size_t num_keys, const Slice* keys,
                                   PinnableSlice* values, Status* statuses,
                                   const bool sorted_input) {
-  assert(options.io_activity == Env::IOActivity::kUnknown);
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kMultiGet) {
+    Status s = Status::InvalidArgument(
+        "Can only call MultiGet with `ReadOptions::io_activity` is "
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kMultiGet`");
+
+    for (size_t i = 0; i < num_keys; ++i) {
+      if (statuses[i].ok()) {
+        statuses[i] = s;
+      }
+    }
+    return;
+  }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kMultiGet;
+  }
   SequenceNumber min_uncommitted, snap_seq;
-  const SnapshotBackup backed_by_snapshot =
+  const SnapshotBackup backed_by_snapshot = wupt_db_->AssignMinMaxSeqs(
-      wupt_db_->AssignMinMaxSeqs(options.snapshot, &min_uncommitted, &snap_seq);
+      read_options.snapshot, &min_uncommitted, &snap_seq);
   WriteUnpreparedTxnReadCallback callback(wupt_db_, snap_seq, min_uncommitted,
                                           unprep_seqs_, backed_by_snapshot);
-  write_batch_.MultiGetFromBatchAndDB(db_, options, column_family, num_keys,
+  write_batch_.MultiGetFromBatchAndDB(db_, read_options, column_family,
-                                      keys, values, statuses, sorted_input,
+                                      num_keys, keys, values, statuses,
-                                      &callback);
+                                      sorted_input, &callback);
   if (UNLIKELY(!callback.valid() ||
                !wupt_db_->ValidateSnapshot(snap_seq, backed_by_snapshot))) {
     wupt_db_->WPRecordTick(TXN_GET_TRY_AGAIN);
@@ -966,14 +982,26 @@ void WriteUnpreparedTxn::MultiGet(const ReadOptions& options,
   }
 }
 
-Status WriteUnpreparedTxn::Get(const ReadOptions& options,
+Status WriteUnpreparedTxn::Get(const ReadOptions& _read_options,
                                ColumnFamilyHandle* column_family,
                                const Slice& key, PinnableSlice* value) {
-  if (options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kGet) {
     return Status::InvalidArgument(
-        "Cannot call Get with `ReadOptions::io_activity` != "
+        "Can only call Get with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`");
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kGet`");
   }
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kGet;
+  }
+
+  return GetImpl(read_options, column_family, key, value);
+}
+
+Status WriteUnpreparedTxn::GetImpl(const ReadOptions& options,
+                                   ColumnFamilyHandle* column_family,
+                                   const Slice& key, PinnableSlice* value) {
   SequenceNumber min_uncommitted, snap_seq;
   const SnapshotBackup backed_by_snapshot =
       wupt_db_->AssignMinMaxSeqs(options.snapshot, &min_uncommitted, &snap_seq);

utilities/transactions/write_unprepared_txn.h

@@ -184,12 +184,12 @@ class WriteUnpreparedTxn : public WritePreparedTxn {
   // Get and GetIterator needs to be overridden so that a ReadCallback to
   // handle read-your-own-write is used.
   using Transaction::Get;
-  virtual Status Get(const ReadOptions& options,
+  virtual Status Get(const ReadOptions& _read_options,
                      ColumnFamilyHandle* column_family, const Slice& key,
                      PinnableSlice* value) override;
 
   using Transaction::MultiGet;
-  virtual void MultiGet(const ReadOptions& options,
+  virtual void MultiGet(const ReadOptions& _read_options,
                         ColumnFamilyHandle* column_family,
                         const size_t num_keys, const Slice* keys,
                         PinnableSlice* values, Status* statuses,
@@ -211,6 +211,10 @@ class WriteUnpreparedTxn : public WritePreparedTxn {
   friend class WriteUnpreparedTxnDB;
 
   const std::map<SequenceNumber, size_t>& GetUnpreparedSequenceNumbers();
+  using Transaction::GetImpl;
+  Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
+                 const Slice& key, PinnableSlice* value) override;
+
   Status WriteRollbackKeys(const LockTracker& tracked_keys,
                            WriteBatchWithIndex* rollback_batch,
                            ReadCallback* callback, const ReadOptions& roptions);
@@ -336,4 +340,3 @@ class WriteUnpreparedTxn : public WritePreparedTxn {
 };
 
 }  // namespace ROCKSDB_NAMESPACE
-

utilities/transactions/write_unprepared_txn_db.cc

@@ -385,13 +385,19 @@ static void CleanupWriteUnpreparedTxnDBIterator(void* arg1, void* /*arg2*/) {
 }
 }  // anonymous namespace
 
-Iterator* WriteUnpreparedTxnDB::NewIterator(const ReadOptions& options,
+Iterator* WriteUnpreparedTxnDB::NewIterator(const ReadOptions& _read_options,
                                             ColumnFamilyHandle* column_family,
                                             WriteUnpreparedTxn* txn) {
-  if (options.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
     return NewErrorIterator(Status::InvalidArgument(
-        "Cannot call NewIterator with `ReadOptions::io_activity` != "
+        "Can only call NewIterator with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`"));
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`"));
+  }
+
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
   }
   // TODO(lth): Refactor so that this logic is shared with WritePrepared.
   constexpr bool expose_blob_index = false;
@@ -431,11 +437,11 @@ Iterator* WriteUnpreparedTxnDB::NewIterator(const ReadOptions& options,
   // max_visible_seq, and then return the last visible value, so that this
   // restriction can be lifted.
   const Snapshot* snapshot = nullptr;
-  if (options.snapshot == nullptr) {
+  if (read_options.snapshot == nullptr) {
     snapshot = GetSnapshot();
     own_snapshot = std::make_shared<ManagedSnapshot>(db_impl_, snapshot);
   } else {
-    snapshot = options.snapshot;
+    snapshot = read_options.snapshot;
   }
 
   snapshot_seq = snapshot->GetSequenceNumber();
@@ -467,8 +473,8 @@ Iterator* WriteUnpreparedTxnDB::NewIterator(const ReadOptions& options,
   auto* state =
       new IteratorState(this, snapshot_seq, own_snapshot, min_uncommitted, txn);
   auto* db_iter = db_impl_->NewIteratorImpl(
-      options, cfd, state->MaxVisibleSeq(), &state->callback, expose_blob_index,
+      read_options, cfd, state->MaxVisibleSeq(), &state->callback,
-      allow_refresh);
+      expose_blob_index, allow_refresh);
   db_iter->RegisterCleanup(CleanupWriteUnpreparedTxnDBIterator, state, nullptr);
   return db_iter;
 }

utilities/transactions/write_unprepared_txn_db.h

@@ -27,7 +27,7 @@ class WriteUnpreparedTxnDB : public WritePreparedTxnDB {
   struct IteratorState;
 
   using WritePreparedTxnDB::NewIterator;
-  Iterator* NewIterator(const ReadOptions& options,
+  Iterator* NewIterator(const ReadOptions& _read_options,
                         ColumnFamilyHandle* column_family,
                         WriteUnpreparedTxn* txn);
 

utilities/ttl/db_ttl_impl.cc

@@ -594,14 +594,19 @@ Status DBWithTTLImpl::Write(const WriteOptions& opts, WriteBatch* updates) {
   }
 }
 
-Iterator* DBWithTTLImpl::NewIterator(const ReadOptions& opts,
+Iterator* DBWithTTLImpl::NewIterator(const ReadOptions& _read_options,
                                      ColumnFamilyHandle* column_family) {
-  if (opts.io_activity != Env::IOActivity::kUnknown) {
+  if (_read_options.io_activity != Env::IOActivity::kUnknown &&
+      _read_options.io_activity != Env::IOActivity::kDBIterator) {
     return NewErrorIterator(Status::InvalidArgument(
-        "Cannot call NewIterator with `ReadOptions::io_activity` != "
+        "Can only call NewIterator with `ReadOptions::io_activity` is "
-        "`Env::IOActivity::kUnknown`"));
+        "`Env::IOActivity::kUnknown` or `Env::IOActivity::kDBIterator`"));
   }
-  return new TtlIterator(db_->NewIterator(opts, column_family));
+  ReadOptions read_options(_read_options);
+  if (read_options.io_activity == Env::IOActivity::kUnknown) {
+    read_options.io_activity = Env::IOActivity::kDBIterator;
+  }
+  return new TtlIterator(db_->NewIterator(read_options, column_family));
 }
 
 void DBWithTTLImpl::SetTtl(ColumnFamilyHandle* h, int32_t ttl) {

utilities/ttl/db_ttl_impl.h

@@ -78,7 +78,7 @@ class DBWithTTLImpl : public DBWithTTL {
   virtual Status Write(const WriteOptions& opts, WriteBatch* updates) override;
 
   using StackableDB::NewIterator;
-  virtual Iterator* NewIterator(const ReadOptions& opts,
+  virtual Iterator* NewIterator(const ReadOptions& _read_options,
                                 ColumnFamilyHandle* column_family) override;
 
   virtual DB* GetBaseDB() override { return db_; }

utilities/write_batch_with_index/write_batch_with_index.cc

@@ -531,7 +531,8 @@ Status WriteBatchWithIndex::GetFromBatchAndDB(
 
   // Did not find key in batch OR could not resolve Merges.  Try DB.
   if (!callback) {
-    s = db->Get(read_options, column_family, key, pinnable_val);
+    s = static_cast_with_check<DBImpl>(db->GetRootDB())
+            ->GetImpl(read_options, column_family, key, pinnable_val);
   } else {
     DBImpl::GetImplOptions get_impl_options;
     get_impl_options.column_family = column_family;