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rocksdb/db/table_cache.cc
leipeng 68ce5d84f6 Add new Iterator API Refresh(const snapshot*) (#10594) 
Summary:
This PR resolves https://github.com/facebook/rocksdb/issues/10487 & https://github.com/facebook/rocksdb/issues/10536, user code needs to call Refresh() periodically.

The main code change is to support range deletions. A range tombstone iterator uses a sequence number as upper bound to decide which range tombstones are effective. During Iterator refresh, this sequence number upper bound needs to be updated for all range tombstone iterators under DBIter and LevelIterator. LevelIterator may create new table iterators and range tombstone iterator during scanning, so it needs to be aware of iterator refresh. The code path that propagates this change is `db_iter_->set_sequence(read_seq)  -> MergingIterator::SetRangeDelReadSeqno() -> TruncatedRangeDelIterator::SetRangeDelReadSeqno() and LevelIterator::SetRangeDelReadSeqno()`.

This change also fixes an issue where range tombstone iterators created by LevelIterator may access ReadOptions::snapshot, even though we do not explicitly require users to keep a snapshot alive after creating an Iterator.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10594

Test Plan:
* New unit tests.
* Add Iterator::Refresh(snapshot) to stress test. Note that this change only adds tests for refreshing to the same snapshot since this is the main target use case.

TODO in a following PR:
* Stress test Iterator::Refresh() to different snapshots or no snapshot.

Reviewed By: ajkr

Differential Revision: D48456896

Pulled By: cbi42

fbshipit-source-id: 2e642c04e91235cc9542ef4cd37b3c20823bd779
2023-09-15 10:44:43 -07:00

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// 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).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "db/table_cache.h"
#include "db/dbformat.h"
#include "db/range_tombstone_fragmenter.h"
#include "db/snapshot_impl.h"
#include "db/version_edit.h"
#include "file/file_util.h"
#include "file/filename.h"
#include "file/random_access_file_reader.h"
#include "monitoring/perf_context_imp.h"
#include "rocksdb/advanced_options.h"
#include "rocksdb/statistics.h"
#include "table/block_based/block_based_table_reader.h"
#include "table/get_context.h"
#include "table/internal_iterator.h"
#include "table/iterator_wrapper.h"
#include "table/multiget_context.h"
#include "table/table_builder.h"
#include "table/table_reader.h"
#include "test_util/sync_point.h"
#include "util/cast_util.h"
#include "util/coding.h"
#include "util/stop_watch.h"
// Generate the regular and coroutine versions of some methods by
// including table_cache_sync_and_async.h twice
// Macros in the header will expand differently based on whether
// WITH_COROUTINES or WITHOUT_COROUTINES is defined
// clang-format off
#define WITHOUT_COROUTINES
#include "db/table_cache_sync_and_async.h"
#undef WITHOUT_COROUTINES
#define WITH_COROUTINES
#include "db/table_cache_sync_and_async.h"
#undef WITH_COROUTINES
// clang-format on
namespace ROCKSDB_NAMESPACE {
namespace {
static Slice GetSliceForFileNumber(const uint64_t* file_number) {
return Slice(reinterpret_cast<const char*>(file_number),
sizeof(*file_number));
}
void AppendVarint64(IterKey* key, uint64_t v) {
char buf[10];
auto ptr = EncodeVarint64(buf, v);
key->TrimAppend(key->Size(), buf, ptr - buf);
}
} // anonymous namespace
const int kLoadConcurency = 128;
TableCache::TableCache(const ImmutableOptions& ioptions,
const FileOptions* file_options, Cache* const cache,
BlockCacheTracer* const block_cache_tracer,
const std::shared_ptr<IOTracer>& io_tracer,
const std::string& db_session_id)
: ioptions_(ioptions),
file_options_(*file_options),
cache_(cache),
immortal_tables_(false),
block_cache_tracer_(block_cache_tracer),
loader_mutex_(kLoadConcurency),
io_tracer_(io_tracer),
db_session_id_(db_session_id) {
if (ioptions_.row_cache) {
// If the same cache is shared by multiple instances, we need to
// disambiguate its entries.
PutVarint64(&row_cache_id_, ioptions_.row_cache->NewId());
}
}
TableCache::~TableCache() {}
Status TableCache::GetTableReader(
const ReadOptions& ro, const FileOptions& file_options,
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta, bool sequential_mode,
uint8_t block_protection_bytes_per_key, HistogramImpl* file_read_hist,
std::unique_ptr<TableReader>* table_reader,
const std::shared_ptr<const SliceTransform>& prefix_extractor,
bool skip_filters, int level, bool prefetch_index_and_filter_in_cache,
size_t max_file_size_for_l0_meta_pin, Temperature file_temperature) {
std::string fname = TableFileName(
ioptions_.cf_paths, file_meta.fd.GetNumber(), file_meta.fd.GetPathId());
std::unique_ptr<FSRandomAccessFile> file;
FileOptions fopts = file_options;
fopts.temperature = file_temperature;
Status s = PrepareIOFromReadOptions(ro, ioptions_.clock, fopts.io_options);
TEST_SYNC_POINT_CALLBACK("TableCache::GetTableReader:BeforeOpenFile",
const_cast<Status*>(&s));
if (s.ok()) {
s = ioptions_.fs->NewRandomAccessFile(fname, fopts, &file, nullptr);
}
if (s.ok()) {
RecordTick(ioptions_.stats, NO_FILE_OPENS);
} else if (s.IsPathNotFound()) {
fname = Rocks2LevelTableFileName(fname);
// If this file is also not found, we want to use the error message
// that contains the table file name which is less confusing.
Status temp_s =
PrepareIOFromReadOptions(ro, ioptions_.clock, fopts.io_options);
if (temp_s.ok()) {
temp_s = ioptions_.fs->NewRandomAccessFile(fname, file_options, &file,
nullptr);
}
if (temp_s.ok()) {
RecordTick(ioptions_.stats, NO_FILE_OPENS);
s = temp_s;
}
}
if (s.ok()) {
if (!sequential_mode && ioptions_.advise_random_on_open) {
file->Hint(FSRandomAccessFile::kRandom);
}
if (ioptions_.default_temperature != Temperature::kUnknown &&
file_temperature == Temperature::kUnknown) {
file_temperature = ioptions_.default_temperature;
}
StopWatch sw(ioptions_.clock, ioptions_.stats, TABLE_OPEN_IO_MICROS);
std::unique_ptr<RandomAccessFileReader> file_reader(
new RandomAccessFileReader(std::move(file), fname, ioptions_.clock,
io_tracer_, ioptions_.stats, SST_READ_MICROS,
file_read_hist, ioptions_.rate_limiter.get(),
ioptions_.listeners, file_temperature,
level == ioptions_.num_levels - 1));
UniqueId64x2 expected_unique_id;
if (ioptions_.verify_sst_unique_id_in_manifest) {
expected_unique_id = file_meta.unique_id;
} else {
expected_unique_id = kNullUniqueId64x2; // null ID == no verification
}
s = ioptions_.table_factory->NewTableReader(
ro,
TableReaderOptions(
ioptions_, prefix_extractor, file_options, internal_comparator,
block_protection_bytes_per_key, skip_filters, immortal_tables_,
false /* force_direct_prefetch */, level, block_cache_tracer_,
max_file_size_for_l0_meta_pin, db_session_id_,
file_meta.fd.GetNumber(), expected_unique_id,
file_meta.fd.largest_seqno, file_meta.tail_size,
file_meta.user_defined_timestamps_persisted),
std::move(file_reader), file_meta.fd.GetFileSize(), table_reader,
prefetch_index_and_filter_in_cache);
TEST_SYNC_POINT("TableCache::GetTableReader:0");
}
return s;
}
Status TableCache::FindTable(
const ReadOptions& ro, const FileOptions& file_options,
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta, TypedHandle** handle,
uint8_t block_protection_bytes_per_key,
const std::shared_ptr<const SliceTransform>& prefix_extractor,
const bool no_io, HistogramImpl* file_read_hist, bool skip_filters,
int level, bool prefetch_index_and_filter_in_cache,
size_t max_file_size_for_l0_meta_pin, Temperature file_temperature) {
PERF_TIMER_GUARD_WITH_CLOCK(find_table_nanos, ioptions_.clock);
uint64_t number = file_meta.fd.GetNumber();
Slice key = GetSliceForFileNumber(&number);
*handle = cache_.Lookup(key);
TEST_SYNC_POINT_CALLBACK("TableCache::FindTable:0",
const_cast<bool*>(&no_io));
if (*handle == nullptr) {
if (no_io) {
return Status::Incomplete("Table not found in table_cache, no_io is set");
}
MutexLock load_lock(&loader_mutex_.Get(key));
// We check the cache again under loading mutex
*handle = cache_.Lookup(key);
if (*handle != nullptr) {
return Status::OK();
}
std::unique_ptr<TableReader> table_reader;
Status s = GetTableReader(ro, file_options, internal_comparator, file_meta,
false /* sequential mode */,
block_protection_bytes_per_key, file_read_hist,
&table_reader, prefix_extractor, skip_filters,
level, prefetch_index_and_filter_in_cache,
max_file_size_for_l0_meta_pin, file_temperature);
if (!s.ok()) {
assert(table_reader == nullptr);
RecordTick(ioptions_.stats, NO_FILE_ERRORS);
// We do not cache error results so that if the error is transient,
// or somebody repairs the file, we recover automatically.
} else {
s = cache_.Insert(key, table_reader.get(), 1, handle);
if (s.ok()) {
// Release ownership of table reader.
table_reader.release();
}
}
return s;
}
return Status::OK();
}
InternalIterator* TableCache::NewIterator(
const ReadOptions& options, const FileOptions& file_options,
const InternalKeyComparator& icomparator, const FileMetaData& file_meta,
RangeDelAggregator* range_del_agg,
const std::shared_ptr<const SliceTransform>& prefix_extractor,
TableReader** table_reader_ptr, HistogramImpl* file_read_hist,
TableReaderCaller caller, Arena* arena, bool skip_filters, int level,
size_t max_file_size_for_l0_meta_pin,
const InternalKey* smallest_compaction_key,
const InternalKey* largest_compaction_key, bool allow_unprepared_value,
uint8_t block_protection_bytes_per_key, const SequenceNumber* read_seqno,
TruncatedRangeDelIterator** range_del_iter) {
PERF_TIMER_GUARD(new_table_iterator_nanos);
Status s;
TableReader* table_reader = nullptr;
TypedHandle* handle = nullptr;
if (table_reader_ptr != nullptr) {
*table_reader_ptr = nullptr;
}
bool for_compaction = caller == TableReaderCaller::kCompaction;
auto& fd = file_meta.fd;
table_reader = fd.table_reader;
if (table_reader == nullptr) {
s = FindTable(options, file_options, icomparator, file_meta, &handle,
block_protection_bytes_per_key, prefix_extractor,
options.read_tier == kBlockCacheTier /* no_io */,
file_read_hist, skip_filters, level,
true /* prefetch_index_and_filter_in_cache */,
max_file_size_for_l0_meta_pin, file_meta.temperature);
if (s.ok()) {
table_reader = cache_.Value(handle);
}
}
InternalIterator* result = nullptr;
if (s.ok()) {
if (options.table_filter &&
!options.table_filter(*table_reader->GetTableProperties())) {
result = NewEmptyInternalIterator<Slice>(arena);
} else {
result = table_reader->NewIterator(
options, prefix_extractor.get(), arena, skip_filters, caller,
file_options.compaction_readahead_size, allow_unprepared_value);
}
if (handle != nullptr) {
cache_.RegisterReleaseAsCleanup(handle, *result);
handle = nullptr; // prevent from releasing below
}
if (for_compaction) {
table_reader->SetupForCompaction();
}
if (table_reader_ptr != nullptr) {
*table_reader_ptr = table_reader;
}
}
if (s.ok() && !options.ignore_range_deletions) {
if (range_del_iter != nullptr) {
auto new_range_del_iter =
read_seqno ? table_reader->NewRangeTombstoneIterator(
*read_seqno, options.timestamp)
: table_reader->NewRangeTombstoneIterator(options);
if (new_range_del_iter == nullptr || new_range_del_iter->empty()) {
delete new_range_del_iter;
*range_del_iter = nullptr;
} else {
*range_del_iter = new TruncatedRangeDelIterator(
std::unique_ptr<FragmentedRangeTombstoneIterator>(
new_range_del_iter),
&icomparator, &file_meta.smallest, &file_meta.largest);
}
}
if (range_del_agg != nullptr) {
if (range_del_agg->AddFile(fd.GetNumber())) {
std::unique_ptr<FragmentedRangeTombstoneIterator> new_range_del_iter(
static_cast<FragmentedRangeTombstoneIterator*>(
table_reader->NewRangeTombstoneIterator(options)));
if (new_range_del_iter != nullptr) {
s = new_range_del_iter->status();
}
if (s.ok()) {
const InternalKey* smallest = &file_meta.smallest;
const InternalKey* largest = &file_meta.largest;
if (smallest_compaction_key != nullptr) {
smallest = smallest_compaction_key;
}
if (largest_compaction_key != nullptr) {
largest = largest_compaction_key;
}
range_del_agg->AddTombstones(std::move(new_range_del_iter), smallest,
largest);
}
}
}
}
if (handle != nullptr) {
cache_.Release(handle);
}
if (!s.ok()) {
assert(result == nullptr);
result = NewErrorInternalIterator<Slice>(s, arena);
}
return result;
}
Status TableCache::GetRangeTombstoneIterator(
const ReadOptions& options,
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta, uint8_t block_protection_bytes_per_key,
std::unique_ptr<FragmentedRangeTombstoneIterator>* out_iter) {
assert(out_iter);
const FileDescriptor& fd = file_meta.fd;
Status s;
TableReader* t = fd.table_reader;
TypedHandle* handle = nullptr;
if (t == nullptr) {
s = FindTable(options, file_options_, internal_comparator, file_meta,
&handle, block_protection_bytes_per_key);
if (s.ok()) {
t = cache_.Value(handle);
}
}
if (s.ok()) {
// Note: NewRangeTombstoneIterator could return nullptr
out_iter->reset(t->NewRangeTombstoneIterator(options));
}
if (handle) {
if (*out_iter) {
cache_.RegisterReleaseAsCleanup(handle, **out_iter);
} else {
cache_.Release(handle);
}
}
return s;
}
void TableCache::CreateRowCacheKeyPrefix(const ReadOptions& options,
const FileDescriptor& fd,
const Slice& internal_key,
GetContext* get_context,
IterKey& row_cache_key) {
uint64_t fd_number = fd.GetNumber();
// We use the user key as cache key instead of the internal key,
// otherwise the whole cache would be invalidated every time the
// sequence key increases. However, to support caching snapshot
// reads, we append the sequence number (incremented by 1 to
// distinguish from 0) only in this case.
// If the snapshot is larger than the largest seqno in the file,
// all data should be exposed to the snapshot, so we treat it
// the same as there is no snapshot. The exception is that if
// a seq-checking callback is registered, some internal keys
// may still be filtered out.
uint64_t seq_no = 0;
// Maybe we can include the whole file ifsnapshot == fd.largest_seqno.
if (options.snapshot != nullptr &&
(get_context->has_callback() ||
static_cast_with_check<const SnapshotImpl>(options.snapshot)
->GetSequenceNumber() <= fd.largest_seqno)) {
// We should consider to use options.snapshot->GetSequenceNumber()
// instead of GetInternalKeySeqno(k), which will make the code
// easier to understand.
seq_no = 1 + GetInternalKeySeqno(internal_key);
}
// Compute row cache key.
row_cache_key.TrimAppend(row_cache_key.Size(), row_cache_id_.data(),
row_cache_id_.size());
AppendVarint64(&row_cache_key, fd_number);
AppendVarint64(&row_cache_key, seq_no);
}
bool TableCache::GetFromRowCache(const Slice& user_key, IterKey& row_cache_key,
size_t prefix_size, GetContext* get_context) {
bool found = false;
row_cache_key.TrimAppend(prefix_size, user_key.data(), user_key.size());
RowCacheInterface row_cache{ioptions_.row_cache.get()};
if (auto row_handle = row_cache.Lookup(row_cache_key.GetUserKey())) {
// Cleanable routine to release the cache entry
Cleanable value_pinner;
// If it comes here value is located on the cache.
// found_row_cache_entry points to the value on cache,
// and value_pinner has cleanup procedure for the cached entry.
// After replayGetContextLog() returns, get_context.pinnable_slice_
// will point to cache entry buffer (or a copy based on that) and
// cleanup routine under value_pinner will be delegated to
// get_context.pinnable_slice_. Cache entry is released when
// get_context.pinnable_slice_ is reset.
row_cache.RegisterReleaseAsCleanup(row_handle, value_pinner);
replayGetContextLog(*row_cache.Value(row_handle), user_key, get_context,
&value_pinner);
RecordTick(ioptions_.stats, ROW_CACHE_HIT);
found = true;
} else {
RecordTick(ioptions_.stats, ROW_CACHE_MISS);
}
return found;
}
Status TableCache::Get(
const ReadOptions& options,
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta, const Slice& k, GetContext* get_context,
uint8_t block_protection_bytes_per_key,
const std::shared_ptr<const SliceTransform>& prefix_extractor,
HistogramImpl* file_read_hist, bool skip_filters, int level,
size_t max_file_size_for_l0_meta_pin) {
auto& fd = file_meta.fd;
std::string* row_cache_entry = nullptr;
bool done = false;
IterKey row_cache_key;
std::string row_cache_entry_buffer;
// Check row cache if enabled. Since row cache does not currently store
// sequence numbers, we cannot use it if we need to fetch the sequence.
if (ioptions_.row_cache && !get_context->NeedToReadSequence()) {
auto user_key = ExtractUserKey(k);
CreateRowCacheKeyPrefix(options, fd, k, get_context, row_cache_key);
done = GetFromRowCache(user_key, row_cache_key, row_cache_key.Size(),
get_context);
if (!done) {
row_cache_entry = &row_cache_entry_buffer;
}
}
Status s;
TableReader* t = fd.table_reader;
TypedHandle* handle = nullptr;
if (!done) {
assert(s.ok());
if (t == nullptr) {
s = FindTable(options, file_options_, internal_comparator, file_meta,
&handle, block_protection_bytes_per_key, prefix_extractor,
options.read_tier == kBlockCacheTier /* no_io */,
file_read_hist, skip_filters, level,
true /* prefetch_index_and_filter_in_cache */,
max_file_size_for_l0_meta_pin, file_meta.temperature);
if (s.ok()) {
t = cache_.Value(handle);
}
}
SequenceNumber* max_covering_tombstone_seq =
get_context->max_covering_tombstone_seq();
if (s.ok() && max_covering_tombstone_seq != nullptr &&
!options.ignore_range_deletions) {
std::unique_ptr<FragmentedRangeTombstoneIterator> range_del_iter(
t->NewRangeTombstoneIterator(options));
if (range_del_iter != nullptr) {
SequenceNumber seq =
range_del_iter->MaxCoveringTombstoneSeqnum(ExtractUserKey(k));
if (seq > *max_covering_tombstone_seq) {
*max_covering_tombstone_seq = seq;
if (get_context->NeedTimestamp()) {
get_context->SetTimestampFromRangeTombstone(
range_del_iter->timestamp());
}
}
}
}
if (s.ok()) {
get_context->SetReplayLog(row_cache_entry); // nullptr if no cache.
s = t->Get(options, k, get_context, prefix_extractor.get(), skip_filters);
get_context->SetReplayLog(nullptr);
} else if (options.read_tier == kBlockCacheTier && s.IsIncomplete()) {
// Couldn't find Table in cache but treat as kFound if no_io set
get_context->MarkKeyMayExist();
s = Status::OK();
done = true;
}
}
// Put the replay log in row cache only if something was found.
if (!done && s.ok() && row_cache_entry && !row_cache_entry->empty()) {
RowCacheInterface row_cache{ioptions_.row_cache.get()};
size_t charge = row_cache_entry->capacity() + sizeof(std::string);
auto row_ptr = new std::string(std::move(*row_cache_entry));
Status rcs = row_cache.Insert(row_cache_key.GetUserKey(), row_ptr, charge);
if (!rcs.ok()) {
// If row cache is full, it's OK to continue, but we keep ownership of
// row_ptr.
delete row_ptr;
}
}
if (handle != nullptr) {
cache_.Release(handle);
}
return s;
}
void TableCache::UpdateRangeTombstoneSeqnums(
const ReadOptions& options, TableReader* t,
MultiGetContext::Range& table_range) {
std::unique_ptr<FragmentedRangeTombstoneIterator> range_del_iter(
t->NewRangeTombstoneIterator(options));
if (range_del_iter != nullptr) {
for (auto iter = table_range.begin(); iter != table_range.end(); ++iter) {
SequenceNumber* max_covering_tombstone_seq =
iter->get_context->max_covering_tombstone_seq();
SequenceNumber seq =
range_del_iter->MaxCoveringTombstoneSeqnum(iter->ukey_with_ts);
if (seq > *max_covering_tombstone_seq) {
*max_covering_tombstone_seq = seq;
if (iter->get_context->NeedTimestamp()) {
iter->get_context->SetTimestampFromRangeTombstone(
range_del_iter->timestamp());
}
}
}
}
}
Status TableCache::MultiGetFilter(
const ReadOptions& options,
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta,
const std::shared_ptr<const SliceTransform>& prefix_extractor,
HistogramImpl* file_read_hist, int level,
MultiGetContext::Range* mget_range, TypedHandle** table_handle,
uint8_t block_protection_bytes_per_key) {
auto& fd = file_meta.fd;
IterKey row_cache_key;
std::string row_cache_entry_buffer;
// Check if we need to use the row cache. If yes, then we cannot do the
// filtering here, since the filtering needs to happen after the row cache
// lookup.
KeyContext& first_key = *mget_range->begin();
if (ioptions_.row_cache && !first_key.get_context->NeedToReadSequence()) {
return Status::NotSupported();
}
Status s;
TableReader* t = fd.table_reader;
TypedHandle* handle = nullptr;
MultiGetContext::Range tombstone_range(*mget_range, mget_range->begin(),
mget_range->end());
if (t == nullptr) {
s = FindTable(options, file_options_, internal_comparator, file_meta,
&handle, block_protection_bytes_per_key, prefix_extractor,
options.read_tier == kBlockCacheTier /* no_io */,
file_read_hist,
/*skip_filters=*/false, level,
true /* prefetch_index_and_filter_in_cache */,
/*max_file_size_for_l0_meta_pin=*/0, file_meta.temperature);
if (s.ok()) {
t = cache_.Value(handle);
}
*table_handle = handle;
}
if (s.ok()) {
s = t->MultiGetFilter(options, prefix_extractor.get(), mget_range);
}
if (s.ok() && !options.ignore_range_deletions) {
// Update the range tombstone sequence numbers for the keys here
// as TableCache::MultiGet may or may not be called, and even if it
// is, it may be called with fewer keys in the rangedue to filtering.
UpdateRangeTombstoneSeqnums(options, t, tombstone_range);
}
if (mget_range->empty() && handle) {
cache_.Release(handle);
*table_handle = nullptr;
}
return s;
}
Status TableCache::GetTableProperties(
const FileOptions& file_options, const ReadOptions& read_options,
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta,
std::shared_ptr<const TableProperties>* properties,
uint8_t block_protection_bytes_per_key,
const std::shared_ptr<const SliceTransform>& prefix_extractor, bool no_io) {
auto table_reader = file_meta.fd.table_reader;
// table already been pre-loaded?
if (table_reader) {
*properties = table_reader->GetTableProperties();
return Status::OK();
}
TypedHandle* table_handle = nullptr;
Status s = FindTable(read_options, file_options, internal_comparator,
file_meta, &table_handle, block_protection_bytes_per_key,
prefix_extractor, no_io);
if (!s.ok()) {
return s;
}
assert(table_handle);
auto table = cache_.Value(table_handle);
*properties = table->GetTableProperties();
cache_.Release(table_handle);
return s;
}
Status TableCache::ApproximateKeyAnchors(
const ReadOptions& ro, const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta, uint8_t block_protection_bytes_per_key,
std::vector<TableReader::Anchor>& anchors) {
Status s;
TableReader* t = file_meta.fd.table_reader;
TypedHandle* handle = nullptr;
if (t == nullptr) {
s = FindTable(ro, file_options_, internal_comparator, file_meta, &handle,
block_protection_bytes_per_key);
if (s.ok()) {
t = cache_.Value(handle);
}
}
if (s.ok() && t != nullptr) {
s = t->ApproximateKeyAnchors(ro, anchors);
}
if (handle != nullptr) {
cache_.Release(handle);
}
return s;
}
size_t TableCache::GetMemoryUsageByTableReader(
const FileOptions& file_options, const ReadOptions& read_options,
const InternalKeyComparator& internal_comparator,
const FileMetaData& file_meta, uint8_t block_protection_bytes_per_key,
const std::shared_ptr<const SliceTransform>& prefix_extractor) {
auto table_reader = file_meta.fd.table_reader;
// table already been pre-loaded?
if (table_reader) {
return table_reader->ApproximateMemoryUsage();
}
TypedHandle* table_handle = nullptr;
Status s = FindTable(read_options, file_options, internal_comparator,
file_meta, &table_handle, block_protection_bytes_per_key,
prefix_extractor, true /* no_io */);
if (!s.ok()) {
return 0;
}
assert(table_handle);
auto table = cache_.Value(table_handle);
auto ret = table->ApproximateMemoryUsage();
cache_.Release(table_handle);
return ret;
}
void TableCache::Evict(Cache* cache, uint64_t file_number) {
cache->Erase(GetSliceForFileNumber(&file_number));
}
uint64_t TableCache::ApproximateOffsetOf(
const ReadOptions& read_options, const Slice& key,
const FileMetaData& file_meta, TableReaderCaller caller,
const InternalKeyComparator& internal_comparator,
uint8_t block_protection_bytes_per_key,
const std::shared_ptr<const SliceTransform>& prefix_extractor) {
uint64_t result = 0;
TableReader* table_reader = file_meta.fd.table_reader;
TypedHandle* table_handle = nullptr;
if (table_reader == nullptr) {
Status s =
FindTable(read_options, file_options_, internal_comparator, file_meta,
&table_handle, block_protection_bytes_per_key,
prefix_extractor, false /* no_io */);
if (s.ok()) {
table_reader = cache_.Value(table_handle);
}
}
if (table_reader != nullptr) {
result = table_reader->ApproximateOffsetOf(read_options, key, caller);
}
if (table_handle != nullptr) {
cache_.Release(table_handle);
}
return result;
}
uint64_t TableCache::ApproximateSize(
const ReadOptions& read_options, const Slice& start, const Slice& end,
const FileMetaData& file_meta, TableReaderCaller caller,
const InternalKeyComparator& internal_comparator,
uint8_t block_protection_bytes_per_key,
const std::shared_ptr<const SliceTransform>& prefix_extractor) {
uint64_t result = 0;
TableReader* table_reader = file_meta.fd.table_reader;
TypedHandle* table_handle = nullptr;
if (table_reader == nullptr) {
Status s =
FindTable(read_options, file_options_, internal_comparator, file_meta,
&table_handle, block_protection_bytes_per_key,
prefix_extractor, false /* no_io */);
if (s.ok()) {
table_reader = cache_.Value(table_handle);
}
}
if (table_reader != nullptr) {
result = table_reader->ApproximateSize(read_options, start, end, caller);
}
if (table_handle != nullptr) {
cache_.Release(table_handle);
}
return result;
}
} // namespace ROCKSDB_NAMESPACE
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