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rocksdb/table/block_based/block_based_table_builder.cc
Kshitij Wadhwa 4ce1dc930c don't run ZSTD_TrainDictionary in BlockBasedTableBuilder if there isn't compression needed (#12453) 
Summary:
fixes https://github.com/facebook/rocksdb/issues/12409

### Issue

ZSTD_TrainDictionary [[link](a53ed91691/table/block_based/block_based_table_builder.cc (L1894))] runs for SSTFileWriter::Finish even when bottommost_compression option is set to kNoCompression. This reduces throughput for SstFileWriter::Finish

We construct rocksdb options using ZSTD compression for levels including 2 and above. For levels 0 and 1, we set it to kNoCompression. We also set zstd_max_train_bytes to a non-zero positive value (which is applicable for levels with ZSTD compression enabled). These options are used for the database and also passed to SstFileWriter for creating sst files to be later added to that database. Since the BlockBasedTableBuilder::Finish [[link](a53ed91691/table/block_based/block_based_table_builder.cc (L1892))] only checks for zstd_max_train_bytes to be non-zero positive value, it runs ZSTD_TrainDictionary even when it shouldn't since SSTFileWriter is operating at bottommost level

### Fix

If compression_type is set to kNoCompression, then don't run ZSTD_TrainDictionary and dictionary building

### Testing

I see we have tests for sst file writer with compression type set/unset. Let me know if it isn't covered and I can extend

Pull Request resolved: https://github.com/facebook/rocksdb/pull/12453

Reviewed By: cbi42

Differential Revision: D55030484

Pulled By: ajkr

fbshipit-source-id: 834de2174c2b087d61bf045ca1ae29f337b821a7
2024-03-20 11:07:32 -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 "table/block_based/block_based_table_builder.h"
#include <atomic>
#include <cassert>
#include <cstdio>
#include <list>
#include <map>
#include <memory>
#include <numeric>
#include <string>
#include <unordered_map>
#include <utility>
#include "block_cache.h"
#include "cache/cache_entry_roles.h"
#include "cache/cache_helpers.h"
#include "cache/cache_key.h"
#include "cache/cache_reservation_manager.h"
#include "db/dbformat.h"
#include "index_builder.h"
#include "logging/logging.h"
#include "memory/memory_allocator_impl.h"
#include "rocksdb/cache.h"
#include "rocksdb/comparator.h"
#include "rocksdb/env.h"
#include "rocksdb/filter_policy.h"
#include "rocksdb/flush_block_policy.h"
#include "rocksdb/merge_operator.h"
#include "rocksdb/table.h"
#include "rocksdb/types.h"
#include "table/block_based/block.h"
#include "table/block_based/block_based_table_factory.h"
#include "table/block_based/block_based_table_reader.h"
#include "table/block_based/block_builder.h"
#include "table/block_based/filter_block.h"
#include "table/block_based/filter_policy_internal.h"
#include "table/block_based/full_filter_block.h"
#include "table/block_based/partitioned_filter_block.h"
#include "table/format.h"
#include "table/meta_blocks.h"
#include "table/table_builder.h"
#include "util/coding.h"
#include "util/compression.h"
#include "util/stop_watch.h"
#include "util/string_util.h"
#include "util/work_queue.h"
namespace ROCKSDB_NAMESPACE {
extern const std::string kHashIndexPrefixesBlock;
extern const std::string kHashIndexPrefixesMetadataBlock;
// Without anonymous namespace here, we fail the warning -Wmissing-prototypes
namespace {
constexpr size_t kBlockTrailerSize = BlockBasedTable::kBlockTrailerSize;
// Create a filter block builder based on its type.
FilterBlockBuilder* CreateFilterBlockBuilder(
const ImmutableCFOptions& /*opt*/, const MutableCFOptions& mopt,
const FilterBuildingContext& context,
const bool use_delta_encoding_for_index_values,
PartitionedIndexBuilder* const p_index_builder, size_t ts_sz,
const bool persist_user_defined_timestamps) {
const BlockBasedTableOptions& table_opt = context.table_options;
assert(table_opt.filter_policy); // precondition
FilterBitsBuilder* filter_bits_builder =
BloomFilterPolicy::GetBuilderFromContext(context);
if (filter_bits_builder == nullptr) {
return nullptr;
} else {
if (table_opt.partition_filters) {
assert(p_index_builder != nullptr);
// Since after partition cut request from filter builder it takes time
// until index builder actully cuts the partition, until the end of a
// data block potentially with many keys, we take the lower bound as
// partition size.
assert(table_opt.block_size_deviation <= 100);
auto partition_size =
static_cast<uint32_t>(((table_opt.metadata_block_size *
(100 - table_opt.block_size_deviation)) +
99) /
100);
partition_size = std::max(partition_size, static_cast<uint32_t>(1));
return new PartitionedFilterBlockBuilder(
mopt.prefix_extractor.get(), table_opt.whole_key_filtering,
filter_bits_builder, table_opt.index_block_restart_interval,
use_delta_encoding_for_index_values, p_index_builder, partition_size,
ts_sz, persist_user_defined_timestamps);
} else {
return new FullFilterBlockBuilder(mopt.prefix_extractor.get(),
table_opt.whole_key_filtering,
filter_bits_builder);
}
}
}
bool GoodCompressionRatio(size_t compressed_size, size_t uncomp_size,
int max_compressed_bytes_per_kb) {
// For efficiency, avoid floating point and division
return compressed_size <=
(static_cast<uint64_t>(max_compressed_bytes_per_kb) * uncomp_size) >>
10;
}
} // namespace
// format_version is the block format as defined in include/rocksdb/table.h
Slice CompressBlock(const Slice& uncompressed_data, const CompressionInfo& info,
CompressionType* type, uint32_t format_version,
bool allow_sample, std::string* compressed_output,
std::string* sampled_output_fast,
std::string* sampled_output_slow) {
assert(type);
assert(compressed_output);
assert(compressed_output->empty());
// If requested, we sample one in every N block with a
// fast and slow compression algorithm and report the stats.
// The users can use these stats to decide if it is worthwhile
// enabling compression and they also get a hint about which
// compression algorithm wil be beneficial.
if (allow_sample && info.SampleForCompression() &&
Random::GetTLSInstance()->OneIn(
static_cast<int>(info.SampleForCompression()))) {
// Sampling with a fast compression algorithm
if (sampled_output_fast && (LZ4_Supported() || Snappy_Supported())) {
CompressionType c =
LZ4_Supported() ? kLZ4Compression : kSnappyCompression;
CompressionOptions options;
CompressionContext context(c, options);
CompressionInfo info_tmp(options, context,
CompressionDict::GetEmptyDict(), c,
info.SampleForCompression());
CompressData(uncompressed_data, info_tmp,
GetCompressFormatForVersion(format_version),
sampled_output_fast);
}
// Sampling with a slow but high-compression algorithm
if (sampled_output_slow && (ZSTD_Supported() || Zlib_Supported())) {
CompressionType c = ZSTD_Supported() ? kZSTD : kZlibCompression;
CompressionOptions options;
CompressionContext context(c, options);
CompressionInfo info_tmp(options, context,
CompressionDict::GetEmptyDict(), c,
info.SampleForCompression());
CompressData(uncompressed_data, info_tmp,
GetCompressFormatForVersion(format_version),
sampled_output_slow);
}
}
int max_compressed_bytes_per_kb = info.options().max_compressed_bytes_per_kb;
if (info.type() == kNoCompression || max_compressed_bytes_per_kb <= 0) {
*type = kNoCompression;
return uncompressed_data;
}
// Actually compress the data; if the compression method is not supported,
// or the compression fails etc., just fall back to uncompressed
if (!CompressData(uncompressed_data, info,
GetCompressFormatForVersion(format_version),
compressed_output)) {
*type = kNoCompression;
return uncompressed_data;
}
// Check the compression ratio; if it's not good enough, just fall back to
// uncompressed
if (!GoodCompressionRatio(compressed_output->size(), uncompressed_data.size(),
max_compressed_bytes_per_kb)) {
*type = kNoCompression;
return uncompressed_data;
}
*type = info.type();
return *compressed_output;
}
// kBlockBasedTableMagicNumber was picked by running
// echo rocksdb.table.block_based | sha1sum
// and taking the leading 64 bits.
// Please note that kBlockBasedTableMagicNumber may also be accessed by other
// .cc files
// for that reason we declare it extern in the header but to get the space
// allocated
// it must be not extern in one place.
const uint64_t kBlockBasedTableMagicNumber = 0x88e241b785f4cff7ull;
// We also support reading and writing legacy block based table format (for
// backwards compatibility)
const uint64_t kLegacyBlockBasedTableMagicNumber = 0xdb4775248b80fb57ull;
// A collector that collects properties of interest to block-based table.
// For now this class looks heavy-weight since we only write one additional
// property.
// But in the foreseeable future, we will add more and more properties that are
// specific to block-based table.
class BlockBasedTableBuilder::BlockBasedTablePropertiesCollector
: public InternalTblPropColl {
public:
explicit BlockBasedTablePropertiesCollector(
BlockBasedTableOptions::IndexType index_type, bool whole_key_filtering,
bool prefix_filtering)
: index_type_(index_type),
whole_key_filtering_(whole_key_filtering),
prefix_filtering_(prefix_filtering) {}
Status InternalAdd(const Slice& /*key*/, const Slice& /*value*/,
uint64_t /*file_size*/) override {
// Intentionally left blank. Have no interest in collecting stats for
// individual key/value pairs.
return Status::OK();
}
void BlockAdd(uint64_t /* block_uncomp_bytes */,
uint64_t /* block_compressed_bytes_fast */,
uint64_t /* block_compressed_bytes_slow */) override {
// Intentionally left blank. No interest in collecting stats for
// blocks.
}
Status Finish(UserCollectedProperties* properties) override {
std::string val;
PutFixed32(&val, static_cast<uint32_t>(index_type_));
properties->insert({BlockBasedTablePropertyNames::kIndexType, val});
properties->insert({BlockBasedTablePropertyNames::kWholeKeyFiltering,
whole_key_filtering_ ? kPropTrue : kPropFalse});
properties->insert({BlockBasedTablePropertyNames::kPrefixFiltering,
prefix_filtering_ ? kPropTrue : kPropFalse});
return Status::OK();
}
// The name of the properties collector can be used for debugging purpose.
const char* Name() const override {
return "BlockBasedTablePropertiesCollector";
}
UserCollectedProperties GetReadableProperties() const override {
// Intentionally left blank.
return UserCollectedProperties();
}
private:
BlockBasedTableOptions::IndexType index_type_;
bool whole_key_filtering_;
bool prefix_filtering_;
};
struct BlockBasedTableBuilder::Rep {
const ImmutableOptions ioptions;
// BEGIN from MutableCFOptions
std::shared_ptr<const SliceTransform> prefix_extractor;
// END from MutableCFOptions
const WriteOptions write_options;
const BlockBasedTableOptions table_options;
const InternalKeyComparator& internal_comparator;
// Size in bytes for the user-defined timestamps.
size_t ts_sz;
// When `ts_sz` > 0 and this flag is false, the user-defined timestamp in the
// user key will be stripped when creating the block based table. This
// stripping happens for all user keys, including the keys in data block,
// index block for data block, index block for index block (if index type is
// `kTwoLevelIndexSearch`), index for filter blocks (if using partitioned
// filters), the `first_internal_key` in `IndexValue`, the `end_key` for range
// deletion entries.
// As long as the user keys are sorted when added via `Add` API, their logic
// ordering won't change after timestamps are stripped. However, for each user
// key to be logically equivalent before and after timestamp is stripped, the
// user key should contain the minimum timestamp.
bool persist_user_defined_timestamps;
WritableFileWriter* file;
std::atomic<uint64_t> offset;
size_t alignment;
BlockBuilder data_block;
// Buffers uncompressed data blocks to replay later. Needed when
// compression dictionary is enabled so we can finalize the dictionary before
// compressing any data blocks.
std::vector<std::string> data_block_buffers;
BlockBuilder range_del_block;
InternalKeySliceTransform internal_prefix_transform;
std::unique_ptr<IndexBuilder> index_builder;
PartitionedIndexBuilder* p_index_builder_ = nullptr;
std::string last_key;
const Slice* first_key_in_next_block = nullptr;
CompressionType compression_type;
uint64_t sample_for_compression;
std::atomic<uint64_t> compressible_input_data_bytes;
std::atomic<uint64_t> uncompressible_input_data_bytes;
std::atomic<uint64_t> sampled_input_data_bytes;
std::atomic<uint64_t> sampled_output_slow_data_bytes;
std::atomic<uint64_t> sampled_output_fast_data_bytes;
CompressionOptions compression_opts;
std::unique_ptr<CompressionDict> compression_dict;
std::vector<std::unique_ptr<CompressionContext>> compression_ctxs;
std::vector<std::unique_ptr<UncompressionContext>> verify_ctxs;
std::unique_ptr<UncompressionDict> verify_dict;
size_t data_begin_offset = 0;
TableProperties props;
// States of the builder.
//
// - `kBuffered`: This is the initial state where zero or more data blocks are
// accumulated uncompressed in-memory. From this state, call
// `EnterUnbuffered()` to finalize the compression dictionary if enabled,
// compress/write out any buffered blocks, and proceed to the `kUnbuffered`
// state.
//
// - `kUnbuffered`: This is the state when compression dictionary is finalized
// either because it wasn't enabled in the first place or it's been created
// from sampling previously buffered data. In this state, blocks are simply
// compressed/written out as they fill up. From this state, call `Finish()`
// to complete the file (write meta-blocks, etc.), or `Abandon()` to delete
// the partially created file.
//
// - `kClosed`: This indicates either `Finish()` or `Abandon()` has been
// called, so the table builder is no longer usable. We must be in this
// state by the time the destructor runs.
enum class State {
kBuffered,
kUnbuffered,
kClosed,
};
State state;
// `kBuffered` state is allowed only as long as the buffering of uncompressed
// data blocks (see `data_block_buffers`) does not exceed `buffer_limit`.
uint64_t buffer_limit;
std::shared_ptr<CacheReservationManager>
compression_dict_buffer_cache_res_mgr;
const bool use_delta_encoding_for_index_values;
std::unique_ptr<FilterBlockBuilder> filter_builder;
OffsetableCacheKey base_cache_key;
const TableFileCreationReason reason;
BlockHandle pending_handle; // Handle to add to index block
std::string compressed_output;
std::unique_ptr<FlushBlockPolicy> flush_block_policy;
std::vector<std::unique_ptr<InternalTblPropColl>> table_properties_collectors;
std::unique_ptr<ParallelCompressionRep> pc_rep;
BlockCreateContext create_context;
// The size of the "tail" part of a SST file. "Tail" refers to
// all blocks after data blocks till the end of the SST file.
uint64_t tail_size;
// See class Footer
uint32_t base_context_checksum;
uint64_t get_offset() { return offset.load(std::memory_order_relaxed); }
void set_offset(uint64_t o) { offset.store(o, std::memory_order_relaxed); }
bool IsParallelCompressionEnabled() const {
return compression_opts.parallel_threads > 1;
}
Status GetStatus() {
// We need to make modifications of status visible when status_ok is set
// to false, and this is ensured by status_mutex, so no special memory
// order for status_ok is required.
if (status_ok.load(std::memory_order_relaxed)) {
return Status::OK();
} else {
return CopyStatus();
}
}
Status CopyStatus() {
std::lock_guard<std::mutex> lock(status_mutex);
return status;
}
IOStatus GetIOStatus() {
// We need to make modifications of io_status visible when status_ok is set
// to false, and this is ensured by io_status_mutex, so no special memory
// order for io_status_ok is required.
if (io_status_ok.load(std::memory_order_relaxed)) {
#ifdef ROCKSDB_ASSERT_STATUS_CHECKED // Avoid unnecessary lock acquisition
auto ios = CopyIOStatus();
ios.PermitUncheckedError();
// Assume no races in unit tests
assert(ios.ok());
#endif // ROCKSDB_ASSERT_STATUS_CHECKED
return IOStatus::OK();
} else {
return CopyIOStatus();
}
}
IOStatus CopyIOStatus() {
std::lock_guard<std::mutex> lock(io_status_mutex);
return io_status;
}
// Never erase an existing status that is not OK.
void SetStatus(Status s) {
if (!s.ok() && status_ok.load(std::memory_order_relaxed)) {
// Locking is an overkill for non compression_opts.parallel_threads
// case but since it's unlikely that s is not OK, we take this cost
// to be simplicity.
std::lock_guard<std::mutex> lock(status_mutex);
status = s;
status_ok.store(false, std::memory_order_relaxed);
}
}
// Never erase an existing I/O status that is not OK.
// Calling this will also SetStatus(ios)
void SetIOStatus(IOStatus ios) {
if (!ios.ok() && io_status_ok.load(std::memory_order_relaxed)) {
// Locking is an overkill for non compression_opts.parallel_threads
// case but since it's unlikely that s is not OK, we take this cost
// to be simplicity.
std::lock_guard<std::mutex> lock(io_status_mutex);
io_status = ios;
io_status_ok.store(false, std::memory_order_relaxed);
}
SetStatus(ios);
}
Rep(const BlockBasedTableOptions& table_opt, const TableBuilderOptions& tbo,
WritableFileWriter* f)
: ioptions(tbo.ioptions),
prefix_extractor(tbo.moptions.prefix_extractor),
write_options(tbo.write_options),
table_options(table_opt),
internal_comparator(tbo.internal_comparator),
ts_sz(tbo.internal_comparator.user_comparator()->timestamp_size()),
persist_user_defined_timestamps(
tbo.ioptions.persist_user_defined_timestamps),
file(f),
offset(0),
alignment(table_options.block_align
? std::min(static_cast<size_t>(table_options.block_size),
kDefaultPageSize)
: 0),
data_block(table_options.block_restart_interval,
table_options.use_delta_encoding,
false /* use_value_delta_encoding */,
tbo.internal_comparator.user_comparator()
->CanKeysWithDifferentByteContentsBeEqual()
? BlockBasedTableOptions::kDataBlockBinarySearch
: table_options.data_block_index_type,
table_options.data_block_hash_table_util_ratio, ts_sz,
persist_user_defined_timestamps),
range_del_block(
1 /* block_restart_interval */, true /* use_delta_encoding */,
false /* use_value_delta_encoding */,
BlockBasedTableOptions::kDataBlockBinarySearch /* index_type */,
0.75 /* data_block_hash_table_util_ratio */, ts_sz,
persist_user_defined_timestamps),
internal_prefix_transform(prefix_extractor.get()),
compression_type(tbo.compression_type),
sample_for_compression(tbo.moptions.sample_for_compression),
compressible_input_data_bytes(0),
uncompressible_input_data_bytes(0),
sampled_input_data_bytes(0),
sampled_output_slow_data_bytes(0),
sampled_output_fast_data_bytes(0),
compression_opts(tbo.compression_opts),
compression_dict(),
compression_ctxs(tbo.compression_opts.parallel_threads),
verify_ctxs(tbo.compression_opts.parallel_threads),
verify_dict(),
state((tbo.compression_opts.max_dict_bytes > 0 &&
tbo.compression_type != kNoCompression)
? State::kBuffered
: State::kUnbuffered),
use_delta_encoding_for_index_values(table_opt.format_version >= 4 &&
!table_opt.block_align),
reason(tbo.reason),
flush_block_policy(
table_options.flush_block_policy_factory->NewFlushBlockPolicy(
table_options, data_block)),
create_context(&table_options, &ioptions, ioptions.stats,
compression_type == kZSTD ||
compression_type == kZSTDNotFinalCompression,
tbo.moptions.block_protection_bytes_per_key,
tbo.internal_comparator.user_comparator(),
!use_delta_encoding_for_index_values,
table_opt.index_type ==
BlockBasedTableOptions::kBinarySearchWithFirstKey),
tail_size(0),
status_ok(true),
io_status_ok(true) {
if (tbo.target_file_size == 0) {
buffer_limit = compression_opts.max_dict_buffer_bytes;
} else if (compression_opts.max_dict_buffer_bytes == 0) {
buffer_limit = tbo.target_file_size;
} else {
buffer_limit = std::min(tbo.target_file_size,
compression_opts.max_dict_buffer_bytes);
}
const auto compress_dict_build_buffer_charged =
table_options.cache_usage_options.options_overrides
.at(CacheEntryRole::kCompressionDictionaryBuildingBuffer)
.charged;
if (table_options.block_cache &&
(compress_dict_build_buffer_charged ==
CacheEntryRoleOptions::Decision::kEnabled ||
compress_dict_build_buffer_charged ==
CacheEntryRoleOptions::Decision::kFallback)) {
compression_dict_buffer_cache_res_mgr =
std::make_shared<CacheReservationManagerImpl<
CacheEntryRole::kCompressionDictionaryBuildingBuffer>>(
table_options.block_cache);
} else {
compression_dict_buffer_cache_res_mgr = nullptr;
}
assert(compression_ctxs.size() >= compression_opts.parallel_threads);
for (uint32_t i = 0; i < compression_opts.parallel_threads; i++) {
compression_ctxs[i].reset(
new CompressionContext(compression_type, compression_opts));
}
if (table_options.index_type ==
BlockBasedTableOptions::kTwoLevelIndexSearch) {
p_index_builder_ = PartitionedIndexBuilder::CreateIndexBuilder(
&internal_comparator, use_delta_encoding_for_index_values,
table_options, ts_sz, persist_user_defined_timestamps);
index_builder.reset(p_index_builder_);
} else {
index_builder.reset(IndexBuilder::CreateIndexBuilder(
table_options.index_type, &internal_comparator,
&this->internal_prefix_transform, use_delta_encoding_for_index_values,
table_options, ts_sz, persist_user_defined_timestamps));
}
if (ioptions.optimize_filters_for_hits && tbo.is_bottommost) {
// Apply optimize_filters_for_hits setting here when applicable by
// skipping filter generation
filter_builder.reset();
} else if (tbo.skip_filters) {
// For SstFileWriter skip_filters
filter_builder.reset();
} else if (!table_options.filter_policy) {
// Null filter_policy -> no filter
filter_builder.reset();
} else {
FilterBuildingContext filter_context(table_options);
filter_context.info_log = ioptions.logger;
filter_context.column_family_name = tbo.column_family_name;
filter_context.reason = reason;
// Only populate other fields if known to be in LSM rather than
// generating external SST file
if (reason != TableFileCreationReason::kMisc) {
filter_context.compaction_style = ioptions.compaction_style;
filter_context.num_levels = ioptions.num_levels;
filter_context.level_at_creation = tbo.level_at_creation;
filter_context.is_bottommost = tbo.is_bottommost;
assert(filter_context.level_at_creation < filter_context.num_levels);
}
filter_builder.reset(CreateFilterBlockBuilder(
ioptions, tbo.moptions, filter_context,
use_delta_encoding_for_index_values, p_index_builder_, ts_sz,
persist_user_defined_timestamps));
}
assert(tbo.internal_tbl_prop_coll_factories);
for (auto& factory : *tbo.internal_tbl_prop_coll_factories) {
assert(factory);
std::unique_ptr<InternalTblPropColl> collector{
factory->CreateInternalTblPropColl(tbo.column_family_id,
tbo.level_at_creation)};
if (collector) {
table_properties_collectors.emplace_back(std::move(collector));
}
}
table_properties_collectors.emplace_back(
new BlockBasedTablePropertiesCollector(
table_options.index_type, table_options.whole_key_filtering,
prefix_extractor != nullptr));
if (ts_sz > 0 && persist_user_defined_timestamps) {
table_properties_collectors.emplace_back(
new TimestampTablePropertiesCollector(
tbo.internal_comparator.user_comparator()));
}
if (table_options.verify_compression) {
for (uint32_t i = 0; i < compression_opts.parallel_threads; i++) {
verify_ctxs[i].reset(new UncompressionContext(compression_type));
}
}
// These are only needed for populating table properties
props.column_family_id = tbo.column_family_id;
props.column_family_name = tbo.column_family_name;
props.oldest_key_time = tbo.oldest_key_time;
props.file_creation_time = tbo.file_creation_time;
props.orig_file_number = tbo.cur_file_num;
props.db_id = tbo.db_id;
props.db_session_id = tbo.db_session_id;
props.db_host_id = ioptions.db_host_id;
if (!ReifyDbHostIdProperty(ioptions.env, &props.db_host_id).ok()) {
ROCKS_LOG_INFO(ioptions.logger, "db_host_id property will not be set");
}
if (FormatVersionUsesContextChecksum(table_options.format_version)) {
// Must be non-zero and semi- or quasi-random
// TODO: ideally guaranteed different for related files (e.g. use file
// number and db_session, for benefit of SstFileWriter)
do {
base_context_checksum = Random::GetTLSInstance()->Next();
} while (UNLIKELY(base_context_checksum == 0));
} else {
base_context_checksum = 0;
}
}
Rep(const Rep&) = delete;
Rep& operator=(const Rep&) = delete;
private:
// Synchronize status & io_status accesses across threads from main thread,
// compression thread and write thread in parallel compression.
std::mutex status_mutex;
std::atomic<bool> status_ok;
Status status;
std::mutex io_status_mutex;
std::atomic<bool> io_status_ok;
IOStatus io_status;
};
struct BlockBasedTableBuilder::ParallelCompressionRep {
// Keys is a wrapper of vector of strings avoiding
// releasing string memories during vector clear()
// in order to save memory allocation overhead
class Keys {
public:
Keys() : keys_(kKeysInitSize), size_(0) {}
void PushBack(const Slice& key) {
if (size_ == keys_.size()) {
keys_.emplace_back(key.data(), key.size());
} else {
keys_[size_].assign(key.data(), key.size());
}
size_++;
}
void SwapAssign(std::vector<std::string>& keys) {
size_ = keys.size();
std::swap(keys_, keys);
}
void Clear() { size_ = 0; }
size_t Size() { return size_; }
std::string& Back() { return keys_[size_ - 1]; }
std::string& operator[](size_t idx) {
assert(idx < size_);
return keys_[idx];
}
private:
const size_t kKeysInitSize = 32;
std::vector<std::string> keys_;
size_t size_;
};
std::unique_ptr<Keys> curr_block_keys;
class BlockRepSlot;
// BlockRep instances are fetched from and recycled to
// block_rep_pool during parallel compression.
struct BlockRep {
Slice contents;
Slice compressed_contents;
std::unique_ptr<std::string> data;
std::unique_ptr<std::string> compressed_data;
CompressionType compression_type;
std::unique_ptr<std::string> first_key_in_next_block;
std::unique_ptr<Keys> keys;
std::unique_ptr<BlockRepSlot> slot;
Status status;
};
// Use a vector of BlockRep as a buffer for a determined number
// of BlockRep structures. All data referenced by pointers in
// BlockRep will be freed when this vector is destructed.
using BlockRepBuffer = std::vector<BlockRep>;
BlockRepBuffer block_rep_buf;
// Use a thread-safe queue for concurrent access from block
// building thread and writer thread.
using BlockRepPool = WorkQueue<BlockRep*>;
BlockRepPool block_rep_pool;
// Use BlockRepSlot to keep block order in write thread.
// slot_ will pass references to BlockRep
class BlockRepSlot {
public:
BlockRepSlot() : slot_(1) {}
template <typename T>
void Fill(T&& rep) {
slot_.push(std::forward<T>(rep));
}
void Take(BlockRep*& rep) { slot_.pop(rep); }
private:
// slot_ will pass references to BlockRep in block_rep_buf,
// and those references are always valid before the destruction of
// block_rep_buf.
WorkQueue<BlockRep*> slot_;
};
// Compression queue will pass references to BlockRep in block_rep_buf,
// and those references are always valid before the destruction of
// block_rep_buf.
using CompressQueue = WorkQueue<BlockRep*>;
CompressQueue compress_queue;
std::vector<port::Thread> compress_thread_pool;
// Write queue will pass references to BlockRep::slot in block_rep_buf,
// and those references are always valid before the corresponding
// BlockRep::slot is destructed, which is before the destruction of
// block_rep_buf.
using WriteQueue = WorkQueue<BlockRepSlot*>;
WriteQueue write_queue;
std::unique_ptr<port::Thread> write_thread;
// Estimate output file size when parallel compression is enabled. This is
// necessary because compression & flush are no longer synchronized,
// and BlockBasedTableBuilder::FileSize() is no longer accurate.
// memory_order_relaxed suffices because accurate statistics is not required.
class FileSizeEstimator {
public:
explicit FileSizeEstimator()
: uncomp_bytes_compressed(0),
uncomp_bytes_curr_block(0),
uncomp_bytes_curr_block_set(false),
uncomp_bytes_inflight(0),
blocks_inflight(0),
curr_compression_ratio(0),
estimated_file_size(0) {}
// Estimate file size when a block is about to be emitted to
// compression thread
void EmitBlock(uint64_t uncomp_block_size, uint64_t curr_file_size) {
uint64_t new_uncomp_bytes_inflight =
uncomp_bytes_inflight.fetch_add(uncomp_block_size,
std::memory_order_relaxed) +
uncomp_block_size;
uint64_t new_blocks_inflight =
blocks_inflight.fetch_add(1, std::memory_order_relaxed) + 1;
estimated_file_size.store(
curr_file_size +
static_cast<uint64_t>(
static_cast<double>(new_uncomp_bytes_inflight) *
curr_compression_ratio.load(std::memory_order_relaxed)) +
new_blocks_inflight * kBlockTrailerSize,
std::memory_order_relaxed);
}
// Estimate file size when a block is already reaped from
// compression thread
void ReapBlock(uint64_t compressed_block_size, uint64_t curr_file_size) {
assert(uncomp_bytes_curr_block_set);
uint64_t new_uncomp_bytes_compressed =
uncomp_bytes_compressed + uncomp_bytes_curr_block;
assert(new_uncomp_bytes_compressed > 0);
curr_compression_ratio.store(
(curr_compression_ratio.load(std::memory_order_relaxed) *
uncomp_bytes_compressed +
compressed_block_size) /
static_cast<double>(new_uncomp_bytes_compressed),
std::memory_order_relaxed);
uncomp_bytes_compressed = new_uncomp_bytes_compressed;
uint64_t new_uncomp_bytes_inflight =
uncomp_bytes_inflight.fetch_sub(uncomp_bytes_curr_block,
std::memory_order_relaxed) -
uncomp_bytes_curr_block;
uint64_t new_blocks_inflight =
blocks_inflight.fetch_sub(1, std::memory_order_relaxed) - 1;
estimated_file_size.store(
curr_file_size +
static_cast<uint64_t>(
static_cast<double>(new_uncomp_bytes_inflight) *
curr_compression_ratio.load(std::memory_order_relaxed)) +
new_blocks_inflight * kBlockTrailerSize,
std::memory_order_relaxed);
uncomp_bytes_curr_block_set = false;
}
void SetEstimatedFileSize(uint64_t size) {
estimated_file_size.store(size, std::memory_order_relaxed);
}
uint64_t GetEstimatedFileSize() {
return estimated_file_size.load(std::memory_order_relaxed);
}
void SetCurrBlockUncompSize(uint64_t size) {
uncomp_bytes_curr_block = size;
uncomp_bytes_curr_block_set = true;
}
private:
// Input bytes compressed so far.
uint64_t uncomp_bytes_compressed;
// Size of current block being appended.
uint64_t uncomp_bytes_curr_block;
// Whether uncomp_bytes_curr_block has been set for next
// ReapBlock call.
bool uncomp_bytes_curr_block_set;
// Input bytes under compression and not appended yet.
std::atomic<uint64_t> uncomp_bytes_inflight;
// Number of blocks under compression and not appended yet.
std::atomic<uint64_t> blocks_inflight;
// Current compression ratio, maintained by BGWorkWriteMaybeCompressedBlock.
std::atomic<double> curr_compression_ratio;
// Estimated SST file size.
std::atomic<uint64_t> estimated_file_size;
};
FileSizeEstimator file_size_estimator;
// Facilities used for waiting first block completion. Need to Wait for
// the completion of first block compression and flush to get a non-zero
// compression ratio.
std::atomic<bool> first_block_processed;
std::condition_variable first_block_cond;
std::mutex first_block_mutex;
explicit ParallelCompressionRep(uint32_t parallel_threads)
: curr_block_keys(new Keys()),
block_rep_buf(parallel_threads),
block_rep_pool(parallel_threads),
compress_queue(parallel_threads),
write_queue(parallel_threads),
first_block_processed(false) {
for (uint32_t i = 0; i < parallel_threads; i++) {
block_rep_buf[i].contents = Slice();
block_rep_buf[i].compressed_contents = Slice();
block_rep_buf[i].data.reset(new std::string());
block_rep_buf[i].compressed_data.reset(new std::string());
block_rep_buf[i].compression_type = CompressionType();
block_rep_buf[i].first_key_in_next_block.reset(new std::string());
block_rep_buf[i].keys.reset(new Keys());
block_rep_buf[i].slot.reset(new BlockRepSlot());
block_rep_buf[i].status = Status::OK();
block_rep_pool.push(&block_rep_buf[i]);
}
}
~ParallelCompressionRep() { block_rep_pool.finish(); }
// Make a block prepared to be emitted to compression thread
// Used in non-buffered mode
BlockRep* PrepareBlock(CompressionType compression_type,
const Slice* first_key_in_next_block,
BlockBuilder* data_block) {
BlockRep* block_rep =
PrepareBlockInternal(compression_type, first_key_in_next_block);
assert(block_rep != nullptr);
data_block->SwapAndReset(*(block_rep->data));
block_rep->contents = *(block_rep->data);
std::swap(block_rep->keys, curr_block_keys);
curr_block_keys->Clear();
return block_rep;
}
// Used in EnterUnbuffered
BlockRep* PrepareBlock(CompressionType compression_type,
const Slice* first_key_in_next_block,
std::string* data_block,
std::vector<std::string>* keys) {
BlockRep* block_rep =
PrepareBlockInternal(compression_type, first_key_in_next_block);
assert(block_rep != nullptr);
std::swap(*(block_rep->data), *data_block);
block_rep->contents = *(block_rep->data);
block_rep->keys->SwapAssign(*keys);
return block_rep;
}
// Emit a block to compression thread
void EmitBlock(BlockRep* block_rep) {
assert(block_rep != nullptr);
assert(block_rep->status.ok());
if (!write_queue.push(block_rep->slot.get())) {
return;
}
if (!compress_queue.push(block_rep)) {
return;
}
if (!first_block_processed.load(std::memory_order_relaxed)) {
std::unique_lock<std::mutex> lock(first_block_mutex);
first_block_cond.wait(lock, [this] {
return first_block_processed.load(std::memory_order_relaxed);
});
}
}
// Reap a block from compression thread
void ReapBlock(BlockRep* block_rep) {
assert(block_rep != nullptr);
block_rep->compressed_data->clear();
block_rep_pool.push(block_rep);
if (!first_block_processed.load(std::memory_order_relaxed)) {
std::lock_guard<std::mutex> lock(first_block_mutex);
first_block_processed.store(true, std::memory_order_relaxed);
first_block_cond.notify_one();
}
}
private:
BlockRep* PrepareBlockInternal(CompressionType compression_type,
const Slice* first_key_in_next_block) {
BlockRep* block_rep = nullptr;
block_rep_pool.pop(block_rep);
assert(block_rep != nullptr);
assert(block_rep->data);
block_rep->compression_type = compression_type;
if (first_key_in_next_block == nullptr) {
block_rep->first_key_in_next_block.reset(nullptr);
} else {
block_rep->first_key_in_next_block->assign(
first_key_in_next_block->data(), first_key_in_next_block->size());
}
return block_rep;
}
};
BlockBasedTableBuilder::BlockBasedTableBuilder(
const BlockBasedTableOptions& table_options, const TableBuilderOptions& tbo,
WritableFileWriter* file) {
BlockBasedTableOptions sanitized_table_options(table_options);
if (sanitized_table_options.format_version == 0 &&
sanitized_table_options.checksum != kCRC32c) {
ROCKS_LOG_WARN(
tbo.ioptions.logger,
"Silently converting format_version to 1 because checksum is "
"non-default");
// silently convert format_version to 1 to keep consistent with current
// behavior
sanitized_table_options.format_version = 1;
}
auto ucmp = tbo.internal_comparator.user_comparator();
assert(ucmp);
(void)ucmp; // avoids unused variable error.
rep_ = new Rep(sanitized_table_options, tbo, file);
TEST_SYNC_POINT_CALLBACK(
"BlockBasedTableBuilder::BlockBasedTableBuilder:PreSetupBaseCacheKey",
const_cast<TableProperties*>(&rep_->props));
BlockBasedTable::SetupBaseCacheKey(&rep_->props, tbo.db_session_id,
tbo.cur_file_num, &rep_->base_cache_key);
if (rep_->IsParallelCompressionEnabled()) {
StartParallelCompression();
}
}
BlockBasedTableBuilder::~BlockBasedTableBuilder() {
// Catch errors where caller forgot to call Finish()
assert(rep_->state == Rep::State::kClosed);
delete rep_;
}
void BlockBasedTableBuilder::Add(const Slice& key, const Slice& value) {
Rep* r = rep_;
assert(rep_->state != Rep::State::kClosed);
if (!ok()) {
return;
}
ValueType value_type = ExtractValueType(key);
if (IsValueType(value_type)) {
#ifndef NDEBUG
if (r->props.num_entries > r->props.num_range_deletions) {
assert(r->internal_comparator.Compare(key, Slice(r->last_key)) > 0);
}
#endif // !NDEBUG
auto should_flush = r->flush_block_policy->Update(key, value);
if (should_flush) {
assert(!r->data_block.empty());
r->first_key_in_next_block = &key;
Flush();
if (r->state == Rep::State::kBuffered) {
bool exceeds_buffer_limit =
(r->buffer_limit != 0 && r->data_begin_offset > r->buffer_limit);
bool exceeds_global_block_cache_limit = false;
// Increase cache charging for the last buffered data block
// only if the block is not going to be unbuffered immediately
// and there exists a cache reservation manager
if (!exceeds_buffer_limit &&
r->compression_dict_buffer_cache_res_mgr != nullptr) {
Status s =
r->compression_dict_buffer_cache_res_mgr->UpdateCacheReservation(
r->data_begin_offset);
exceeds_global_block_cache_limit = s.IsMemoryLimit();
}
if (exceeds_buffer_limit || exceeds_global_block_cache_limit) {
EnterUnbuffered();
}
}
// Add item to index block.
// We do not emit the index entry for a block until we have seen the
// first key for the next data block. This allows us to use shorter
// keys in the index block. For example, consider a block boundary
// between the keys "the quick brown fox" and "the who". We can use
// "the r" as the key for the index block entry since it is >= all
// entries in the first block and < all entries in subsequent
// blocks.
if (ok() && r->state == Rep::State::kUnbuffered) {
if (r->IsParallelCompressionEnabled()) {
r->pc_rep->curr_block_keys->Clear();
} else {
r->index_builder->AddIndexEntry(&r->last_key, &key,
r->pending_handle);
}
}
}
// Note: PartitionedFilterBlockBuilder requires key being added to filter
// builder after being added to index builder.
if (r->state == Rep::State::kUnbuffered) {
if (r->IsParallelCompressionEnabled()) {
r->pc_rep->curr_block_keys->PushBack(key);
} else {
if (r->filter_builder != nullptr) {
r->filter_builder->Add(
ExtractUserKeyAndStripTimestamp(key, r->ts_sz));
}
}
}
r->data_block.AddWithLastKey(key, value, r->last_key);
r->last_key.assign(key.data(), key.size());
if (r->state == Rep::State::kBuffered) {
// Buffered keys will be replayed from data_block_buffers during
// `Finish()` once compression dictionary has been finalized.
} else {
if (!r->IsParallelCompressionEnabled()) {
r->index_builder->OnKeyAdded(key);
}
}
// TODO offset passed in is not accurate for parallel compression case
NotifyCollectTableCollectorsOnAdd(key, value, r->get_offset(),
r->table_properties_collectors,
r->ioptions.logger);
} else if (value_type == kTypeRangeDeletion) {
Slice persisted_end = value;
// When timestamps should not be persisted, we physically strip away range
// tombstone end key's user timestamp before passing it along to block
// builder. Physically stripping away start key's user timestamp is
// handled at the block builder level in the same way as the other data
// blocks.
if (r->ts_sz > 0 && !r->persist_user_defined_timestamps) {
persisted_end = StripTimestampFromUserKey(value, r->ts_sz);
}
r->range_del_block.Add(key, persisted_end);
// TODO offset passed in is not accurate for parallel compression case
NotifyCollectTableCollectorsOnAdd(key, value, r->get_offset(),
r->table_properties_collectors,
r->ioptions.logger);
} else {
assert(false);
r->SetStatus(Status::InvalidArgument(
"BlockBasedBuilder::Add() received a key with invalid value type " +
std::to_string(static_cast<unsigned int>(value_type))));
return;
}
r->props.num_entries++;
r->props.raw_key_size += key.size();
if (!r->persist_user_defined_timestamps) {
r->props.raw_key_size -= r->ts_sz;
}
r->props.raw_value_size += value.size();
if (value_type == kTypeDeletion || value_type == kTypeSingleDeletion ||
value_type == kTypeDeletionWithTimestamp) {
r->props.num_deletions++;
} else if (value_type == kTypeRangeDeletion) {
r->props.num_deletions++;
r->props.num_range_deletions++;
} else if (value_type == kTypeMerge) {
r->props.num_merge_operands++;
}
}
void BlockBasedTableBuilder::Flush() {
Rep* r = rep_;
assert(rep_->state != Rep::State::kClosed);
if (!ok()) {
return;
}
if (r->data_block.empty()) {
return;
}
if (r->IsParallelCompressionEnabled() &&
r->state == Rep::State::kUnbuffered) {
r->data_block.Finish();
ParallelCompressionRep::BlockRep* block_rep = r->pc_rep->PrepareBlock(
r->compression_type, r->first_key_in_next_block, &(r->data_block));
assert(block_rep != nullptr);
r->pc_rep->file_size_estimator.EmitBlock(block_rep->data->size(),
r->get_offset());
r->pc_rep->EmitBlock(block_rep);
} else {
WriteBlock(&r->data_block, &r->pending_handle, BlockType::kData);
}
}
void BlockBasedTableBuilder::WriteBlock(BlockBuilder* block,
BlockHandle* handle,
BlockType block_type) {
block->Finish();
std::string uncompressed_block_data;
uncompressed_block_data.reserve(rep_->table_options.block_size);
block->SwapAndReset(uncompressed_block_data);
if (rep_->state == Rep::State::kBuffered) {
assert(block_type == BlockType::kData);
rep_->data_block_buffers.emplace_back(std::move(uncompressed_block_data));
rep_->data_begin_offset += rep_->data_block_buffers.back().size();
return;
}
WriteBlock(uncompressed_block_data, handle, block_type);
}
void BlockBasedTableBuilder::WriteBlock(const Slice& uncompressed_block_data,
BlockHandle* handle,
BlockType block_type) {
Rep* r = rep_;
assert(r->state == Rep::State::kUnbuffered);
Slice block_contents;
CompressionType type;
Status compress_status;
bool is_data_block = block_type == BlockType::kData;
CompressAndVerifyBlock(uncompressed_block_data, is_data_block,
*(r->compression_ctxs[0]), r->verify_ctxs[0].get(),
&(r->compressed_output), &(block_contents), &type,
&compress_status);
r->SetStatus(compress_status);
if (!ok()) {
return;
}
TEST_SYNC_POINT_CALLBACK(
"BlockBasedTableBuilder::WriteBlock:TamperWithCompressedData",
&r->compressed_output);
WriteMaybeCompressedBlock(block_contents, type, handle, block_type,
&uncompressed_block_data);
r->compressed_output.clear();
if (is_data_block) {
r->props.data_size = r->get_offset();
++r->props.num_data_blocks;
}
}
void BlockBasedTableBuilder::BGWorkCompression(
const CompressionContext& compression_ctx,
UncompressionContext* verify_ctx) {
ParallelCompressionRep::BlockRep* block_rep = nullptr;
while (rep_->pc_rep->compress_queue.pop(block_rep)) {
assert(block_rep != nullptr);
CompressAndVerifyBlock(block_rep->contents, true, /* is_data_block*/
compression_ctx, verify_ctx,
block_rep->compressed_data.get(),
&block_rep->compressed_contents,
&(block_rep->compression_type), &block_rep->status);
block_rep->slot->Fill(block_rep);
}
}
void BlockBasedTableBuilder::CompressAndVerifyBlock(
const Slice& uncompressed_block_data, bool is_data_block,
const CompressionContext& compression_ctx, UncompressionContext* verify_ctx,
std::string* compressed_output, Slice* block_contents,
CompressionType* type, Status* out_status) {
Rep* r = rep_;
bool is_status_ok = ok();
if (!r->IsParallelCompressionEnabled()) {
assert(is_status_ok);
}
if (is_status_ok && uncompressed_block_data.size() < kCompressionSizeLimit) {
StopWatchNano timer(
r->ioptions.clock,
ShouldReportDetailedTime(r->ioptions.env, r->ioptions.stats));
if (is_data_block) {
r->compressible_input_data_bytes.fetch_add(uncompressed_block_data.size(),
std::memory_order_relaxed);
}
const CompressionDict* compression_dict;
if (!is_data_block || r->compression_dict == nullptr) {
compression_dict = &CompressionDict::GetEmptyDict();
} else {
compression_dict = r->compression_dict.get();
}
assert(compression_dict != nullptr);
CompressionInfo compression_info(r->compression_opts, compression_ctx,
*compression_dict, r->compression_type,
r->sample_for_compression);
std::string sampled_output_fast;
std::string sampled_output_slow;
*block_contents = CompressBlock(
uncompressed_block_data, compression_info, type,
r->table_options.format_version, is_data_block /* allow_sample */,
compressed_output, &sampled_output_fast, &sampled_output_slow);
if (sampled_output_slow.size() > 0 || sampled_output_fast.size() > 0) {
// Currently compression sampling is only enabled for data block.
assert(is_data_block);
r->sampled_input_data_bytes.fetch_add(uncompressed_block_data.size(),
std::memory_order_relaxed);
r->sampled_output_slow_data_bytes.fetch_add(sampled_output_slow.size(),
std::memory_order_relaxed);
r->sampled_output_fast_data_bytes.fetch_add(sampled_output_fast.size(),
std::memory_order_relaxed);
}
// notify collectors on block add
NotifyCollectTableCollectorsOnBlockAdd(
r->table_properties_collectors, uncompressed_block_data.size(),
sampled_output_fast.size(), sampled_output_slow.size());
// Some of the compression algorithms are known to be unreliable. If
// the verify_compression flag is set then try to de-compress the
// compressed data and compare to the input.
if (*type != kNoCompression && r->table_options.verify_compression) {
// Retrieve the uncompressed contents into a new buffer
const UncompressionDict* verify_dict;
if (!is_data_block || r->verify_dict == nullptr) {
verify_dict = &UncompressionDict::GetEmptyDict();
} else {
verify_dict = r->verify_dict.get();
}
assert(verify_dict != nullptr);
BlockContents contents;
UncompressionInfo uncompression_info(*verify_ctx, *verify_dict,
r->compression_type);
Status uncompress_status = UncompressBlockData(
uncompression_info, block_contents->data(), block_contents->size(),
&contents, r->table_options.format_version, r->ioptions);
if (uncompress_status.ok()) {
bool data_match = contents.data.compare(uncompressed_block_data) == 0;
if (!data_match) {
// The result of the compression was invalid. abort.
const char* const msg =
"Decompressed block did not match pre-compression block";
ROCKS_LOG_ERROR(r->ioptions.logger, "%s", msg);
*out_status = Status::Corruption(msg);
*type = kNoCompression;
}
} else {
// Decompression reported an error. abort.
*out_status = Status::Corruption(std::string("Could not decompress: ") +
uncompress_status.getState());
*type = kNoCompression;
}
}
if (timer.IsStarted()) {
RecordTimeToHistogram(r->ioptions.stats, COMPRESSION_TIMES_NANOS,
timer.ElapsedNanos());
}
} else {
// Status is not OK, or block is too big to be compressed.
if (is_data_block) {
r->uncompressible_input_data_bytes.fetch_add(
uncompressed_block_data.size(), std::memory_order_relaxed);
}
*type = kNoCompression;
}
if (is_data_block) {
r->uncompressible_input_data_bytes.fetch_add(kBlockTrailerSize,
std::memory_order_relaxed);
}
// Abort compression if the block is too big, or did not pass
// verification.
if (*type == kNoCompression) {
*block_contents = uncompressed_block_data;
bool compression_attempted = !compressed_output->empty();
RecordTick(r->ioptions.stats, compression_attempted
? NUMBER_BLOCK_COMPRESSION_REJECTED
: NUMBER_BLOCK_COMPRESSION_BYPASSED);
RecordTick(r->ioptions.stats,
compression_attempted ? BYTES_COMPRESSION_REJECTED
: BYTES_COMPRESSION_BYPASSED,
uncompressed_block_data.size());
} else {
RecordTick(r->ioptions.stats, NUMBER_BLOCK_COMPRESSED);
RecordTick(r->ioptions.stats, BYTES_COMPRESSED_FROM,
uncompressed_block_data.size());
RecordTick(r->ioptions.stats, BYTES_COMPRESSED_TO,
compressed_output->size());
}
}
void BlockBasedTableBuilder::WriteMaybeCompressedBlock(
const Slice& block_contents, CompressionType comp_type, BlockHandle* handle,
BlockType block_type, const Slice* uncompressed_block_data) {
// File format contains a sequence of blocks where each block has:
// block_data: uint8[n]
// compression_type: uint8
// checksum: uint32
Rep* r = rep_;
bool is_data_block = block_type == BlockType::kData;
IOOptions io_options;
IOStatus io_s =
WritableFileWriter::PrepareIOOptions(r->write_options, io_options);
if (!io_s.ok()) {
r->SetIOStatus(io_s);
return;
}
// Old, misleading name of this function: WriteRawBlock
StopWatch sw(r->ioptions.clock, r->ioptions.stats, WRITE_RAW_BLOCK_MICROS);
const uint64_t offset = r->get_offset();
handle->set_offset(offset);
handle->set_size(block_contents.size());
assert(status().ok());
assert(io_status().ok());
if (uncompressed_block_data == nullptr) {
uncompressed_block_data = &block_contents;
assert(comp_type == kNoCompression);
}
{
io_s = r->file->Append(io_options, block_contents);
if (!io_s.ok()) {
r->SetIOStatus(io_s);
return;
}
}
std::array<char, kBlockTrailerSize> trailer;
trailer[0] = comp_type;
uint32_t checksum = ComputeBuiltinChecksumWithLastByte(
r->table_options.checksum, block_contents.data(), block_contents.size(),
/*last_byte*/ comp_type);
checksum += ChecksumModifierForContext(r->base_context_checksum, offset);
if (block_type == BlockType::kFilter) {
Status s = r->filter_builder->MaybePostVerifyFilter(block_contents);
if (!s.ok()) {
r->SetStatus(s);
return;
}
}
EncodeFixed32(trailer.data() + 1, checksum);
TEST_SYNC_POINT_CALLBACK(
"BlockBasedTableBuilder::WriteMaybeCompressedBlock:TamperWithChecksum",
trailer.data());
{
io_s = r->file->Append(io_options, Slice(trailer.data(), trailer.size()));
if (!io_s.ok()) {
r->SetIOStatus(io_s);
return;
}
}
{
bool warm_cache;
switch (r->table_options.prepopulate_block_cache) {
case BlockBasedTableOptions::PrepopulateBlockCache::kFlushOnly:
warm_cache = (r->reason == TableFileCreationReason::kFlush);
break;
case BlockBasedTableOptions::PrepopulateBlockCache::kDisable:
warm_cache = false;
break;
default:
// missing case
assert(false);
warm_cache = false;
}
if (warm_cache) {
Status s = InsertBlockInCacheHelper(*uncompressed_block_data, handle,
block_type);
if (!s.ok()) {
r->SetStatus(s);
return;
}
}
}
r->set_offset(r->get_offset() + block_contents.size() + kBlockTrailerSize);
if (r->table_options.block_align && is_data_block) {
size_t pad_bytes =
(r->alignment -
((block_contents.size() + kBlockTrailerSize) & (r->alignment - 1))) &
(r->alignment - 1);
io_s = r->file->Pad(io_options, pad_bytes);
if (io_s.ok()) {
r->set_offset(r->get_offset() + pad_bytes);
} else {
r->SetIOStatus(io_s);
return;
}
}
if (r->IsParallelCompressionEnabled()) {
if (is_data_block) {
r->pc_rep->file_size_estimator.ReapBlock(block_contents.size(),
r->get_offset());
} else {
r->pc_rep->file_size_estimator.SetEstimatedFileSize(r->get_offset());
}
}
}
void BlockBasedTableBuilder::BGWorkWriteMaybeCompressedBlock() {
Rep* r = rep_;
ParallelCompressionRep::BlockRepSlot* slot = nullptr;
ParallelCompressionRep::BlockRep* block_rep = nullptr;
while (r->pc_rep->write_queue.pop(slot)) {
assert(slot != nullptr);
slot->Take(block_rep);
assert(block_rep != nullptr);
if (!block_rep->status.ok()) {
r->SetStatus(block_rep->status);
// Reap block so that blocked Flush() can finish
// if there is one, and Flush() will notice !ok() next time.
block_rep->status = Status::OK();
r->pc_rep->ReapBlock(block_rep);
continue;
}
for (size_t i = 0; i < block_rep->keys->Size(); i++) {
auto& key = (*block_rep->keys)[i];
if (r->filter_builder != nullptr) {
r->filter_builder->Add(ExtractUserKeyAndStripTimestamp(key, r->ts_sz));
}
r->index_builder->OnKeyAdded(key);
}
r->pc_rep->file_size_estimator.SetCurrBlockUncompSize(
block_rep->data->size());
WriteMaybeCompressedBlock(block_rep->compressed_contents,
block_rep->compression_type, &r->pending_handle,
BlockType::kData, &block_rep->contents);
if (!ok()) {
break;
}
r->props.data_size = r->get_offset();
++r->props.num_data_blocks;
if (block_rep->first_key_in_next_block == nullptr) {
r->index_builder->AddIndexEntry(&(block_rep->keys->Back()), nullptr,
r->pending_handle);
} else {
Slice first_key_in_next_block =
Slice(*block_rep->first_key_in_next_block);
r->index_builder->AddIndexEntry(&(block_rep->keys->Back()),
&first_key_in_next_block,
r->pending_handle);
}
r->pc_rep->ReapBlock(block_rep);
}
}
void BlockBasedTableBuilder::StartParallelCompression() {
rep_->pc_rep.reset(
new ParallelCompressionRep(rep_->compression_opts.parallel_threads));
rep_->pc_rep->compress_thread_pool.reserve(
rep_->compression_opts.parallel_threads);
for (uint32_t i = 0; i < rep_->compression_opts.parallel_threads; i++) {
rep_->pc_rep->compress_thread_pool.emplace_back([this, i] {
BGWorkCompression(*(rep_->compression_ctxs[i]),
rep_->verify_ctxs[i].get());
});
}
rep_->pc_rep->write_thread.reset(
new port::Thread([this] { BGWorkWriteMaybeCompressedBlock(); }));
}
void BlockBasedTableBuilder::StopParallelCompression() {
rep_->pc_rep->compress_queue.finish();
for (auto& thread : rep_->pc_rep->compress_thread_pool) {
thread.join();
}
rep_->pc_rep->write_queue.finish();
rep_->pc_rep->write_thread->join();
}
Status BlockBasedTableBuilder::status() const { return rep_->GetStatus(); }
IOStatus BlockBasedTableBuilder::io_status() const {
return rep_->GetIOStatus();
}
Status BlockBasedTableBuilder::InsertBlockInCacheHelper(
const Slice& block_contents, const BlockHandle* handle,
BlockType block_type) {
Cache* block_cache = rep_->table_options.block_cache.get();
Status s;
auto helper =
GetCacheItemHelper(block_type, rep_->ioptions.lowest_used_cache_tier);
if (block_cache && helper && helper->create_cb) {
CacheKey key = BlockBasedTable::GetCacheKey(rep_->base_cache_key, *handle);
size_t charge;
s = WarmInCache(block_cache, key.AsSlice(), block_contents,
&rep_->create_context, helper, Cache::Priority::LOW,
&charge);
if (s.ok()) {
BlockBasedTable::UpdateCacheInsertionMetrics(
block_type, nullptr /*get_context*/, charge, s.IsOkOverwritten(),
rep_->ioptions.stats);
} else {
RecordTick(rep_->ioptions.stats, BLOCK_CACHE_ADD_FAILURES);
}
}
return s;
}
void BlockBasedTableBuilder::WriteFilterBlock(
MetaIndexBuilder* meta_index_builder) {
if (rep_->filter_builder == nullptr || rep_->filter_builder->IsEmpty()) {
// No filter block needed
return;
}
BlockHandle filter_block_handle;
bool is_partitioned_filter = rep_->table_options.partition_filters;
if (ok()) {
rep_->props.num_filter_entries +=
rep_->filter_builder->EstimateEntriesAdded();
Status s = Status::Incomplete();
while (ok() && s.IsIncomplete()) {
// filter_data is used to store the transferred filter data payload from
// FilterBlockBuilder and deallocate the payload by going out of scope.
// Otherwise, the payload will unnecessarily remain until
// BlockBasedTableBuilder is deallocated.
//
// See FilterBlockBuilder::Finish() for more on the difference in
// transferred filter data payload among different FilterBlockBuilder
// subtypes.
std::unique_ptr<const char[]> filter_data;
Slice filter_content =
rep_->filter_builder->Finish(filter_block_handle, &s, &filter_data);
assert(s.ok() || s.IsIncomplete() || s.IsCorruption());
if (s.IsCorruption()) {
rep_->SetStatus(s);
break;
}
rep_->props.filter_size += filter_content.size();
BlockType btype = is_partitioned_filter && /* last */ s.ok()
? BlockType::kFilterPartitionIndex
: BlockType::kFilter;
WriteMaybeCompressedBlock(filter_content, kNoCompression,
&filter_block_handle, btype);
}
rep_->filter_builder->ResetFilterBitsBuilder();
}
if (ok()) {
// Add mapping from "<filter_block_prefix>.Name" to location
// of filter data.
std::string key;
key = is_partitioned_filter ? BlockBasedTable::kPartitionedFilterBlockPrefix
: BlockBasedTable::kFullFilterBlockPrefix;
key.append(rep_->table_options.filter_policy->CompatibilityName());
meta_index_builder->Add(key, filter_block_handle);
}
}
void BlockBasedTableBuilder::WriteIndexBlock(
MetaIndexBuilder* meta_index_builder, BlockHandle* index_block_handle) {
if (!ok()) {
return;
}
IndexBuilder::IndexBlocks index_blocks;
auto index_builder_status = rep_->index_builder->Finish(&index_blocks);
if (index_builder_status.IsIncomplete()) {
// We we have more than one index partition then meta_blocks are not
// supported for the index. Currently meta_blocks are used only by
// HashIndexBuilder which is not multi-partition.
assert(index_blocks.meta_blocks.empty());
} else if (ok() && !index_builder_status.ok()) {
rep_->SetStatus(index_builder_status);
}
if (ok()) {
for (const auto& item : index_blocks.meta_blocks) {
BlockHandle block_handle;
WriteBlock(item.second, &block_handle, BlockType::kIndex);
if (!ok()) {
break;
}
meta_index_builder->Add(item.first, block_handle);
}
}
if (ok()) {
if (rep_->table_options.enable_index_compression) {
WriteBlock(index_blocks.index_block_contents, index_block_handle,
BlockType::kIndex);
} else {
WriteMaybeCompressedBlock(index_blocks.index_block_contents,
kNoCompression, index_block_handle,
BlockType::kIndex);
}
}
// If there are more index partitions, finish them and write them out
if (index_builder_status.IsIncomplete()) {
bool index_building_finished = false;
while (ok() && !index_building_finished) {
Status s =
rep_->index_builder->Finish(&index_blocks, *index_block_handle);
if (s.ok()) {
index_building_finished = true;
} else if (s.IsIncomplete()) {
// More partitioned index after this one
assert(!index_building_finished);
} else {
// Error
rep_->SetStatus(s);
return;
}
if (rep_->table_options.enable_index_compression) {
WriteBlock(index_blocks.index_block_contents, index_block_handle,
BlockType::kIndex);
} else {
WriteMaybeCompressedBlock(index_blocks.index_block_contents,
kNoCompression, index_block_handle,
BlockType::kIndex);
}
// The last index_block_handle will be for the partition index block
}
}
// If success and need to record in metaindex rather than footer...
if (!FormatVersionUsesIndexHandleInFooter(
rep_->table_options.format_version)) {
meta_index_builder->Add(kIndexBlockName, *index_block_handle);
}
}
void BlockBasedTableBuilder::WritePropertiesBlock(
MetaIndexBuilder* meta_index_builder) {
BlockHandle properties_block_handle;
if (ok()) {
PropertyBlockBuilder property_block_builder;
rep_->props.filter_policy_name =
rep_->table_options.filter_policy != nullptr
? rep_->table_options.filter_policy->Name()
: "";
rep_->props.index_size =
rep_->index_builder->IndexSize() + kBlockTrailerSize;
rep_->props.comparator_name = rep_->ioptions.user_comparator != nullptr
? rep_->ioptions.user_comparator->Name()
: "nullptr";
rep_->props.merge_operator_name =
rep_->ioptions.merge_operator != nullptr
? rep_->ioptions.merge_operator->Name()
: "nullptr";
rep_->props.compression_name =
CompressionTypeToString(rep_->compression_type);
rep_->props.compression_options =
CompressionOptionsToString(rep_->compression_opts);
rep_->props.prefix_extractor_name =
rep_->prefix_extractor ? rep_->prefix_extractor->AsString() : "nullptr";
std::string property_collectors_names = "[";
for (size_t i = 0;
i < rep_->ioptions.table_properties_collector_factories.size(); ++i) {
if (i != 0) {
property_collectors_names += ",";
}
property_collectors_names +=
rep_->ioptions.table_properties_collector_factories[i]->Name();
}
property_collectors_names += "]";
rep_->props.property_collectors_names = property_collectors_names;
if (rep_->table_options.index_type ==
BlockBasedTableOptions::kTwoLevelIndexSearch) {
assert(rep_->p_index_builder_ != nullptr);
rep_->props.index_partitions = rep_->p_index_builder_->NumPartitions();
rep_->props.top_level_index_size =
rep_->p_index_builder_->TopLevelIndexSize(rep_->offset);
}
rep_->props.index_key_is_user_key =
!rep_->index_builder->seperator_is_key_plus_seq();
rep_->props.index_value_is_delta_encoded =
rep_->use_delta_encoding_for_index_values;
if (rep_->sampled_input_data_bytes > 0) {
rep_->props.slow_compression_estimated_data_size = static_cast<uint64_t>(
static_cast<double>(rep_->sampled_output_slow_data_bytes) /
rep_->sampled_input_data_bytes *
rep_->compressible_input_data_bytes +
rep_->uncompressible_input_data_bytes + 0.5);
rep_->props.fast_compression_estimated_data_size = static_cast<uint64_t>(
static_cast<double>(rep_->sampled_output_fast_data_bytes) /
rep_->sampled_input_data_bytes *
rep_->compressible_input_data_bytes +
rep_->uncompressible_input_data_bytes + 0.5);
} else if (rep_->sample_for_compression > 0) {
// We tried to sample but none were found. Assume worst-case (compression
// ratio 1.0) so data is complete and aggregatable.
rep_->props.slow_compression_estimated_data_size =
rep_->compressible_input_data_bytes +
rep_->uncompressible_input_data_bytes;
rep_->props.fast_compression_estimated_data_size =
rep_->compressible_input_data_bytes +
rep_->uncompressible_input_data_bytes;
}
rep_->props.user_defined_timestamps_persisted =
rep_->persist_user_defined_timestamps;
// Add basic properties
property_block_builder.AddTableProperty(rep_->props);
// Add use collected properties
NotifyCollectTableCollectorsOnFinish(
rep_->table_properties_collectors, rep_->ioptions.logger,
&property_block_builder, rep_->props.user_collected_properties,
rep_->props.readable_properties);
Slice block_data = property_block_builder.Finish();
TEST_SYNC_POINT_CALLBACK(
"BlockBasedTableBuilder::WritePropertiesBlock:BlockData", &block_data);
WriteMaybeCompressedBlock(block_data, kNoCompression,
&properties_block_handle, BlockType::kProperties);
}
if (ok()) {
#ifndef NDEBUG
{
uint64_t props_block_offset = properties_block_handle.offset();
uint64_t props_block_size = properties_block_handle.size();
TEST_SYNC_POINT_CALLBACK(
"BlockBasedTableBuilder::WritePropertiesBlock:GetPropsBlockOffset",
&props_block_offset);
TEST_SYNC_POINT_CALLBACK(
"BlockBasedTableBuilder::WritePropertiesBlock:GetPropsBlockSize",
&props_block_size);
}
#endif // !NDEBUG
const std::string* properties_block_meta = &kPropertiesBlockName;
TEST_SYNC_POINT_CALLBACK(
"BlockBasedTableBuilder::WritePropertiesBlock:Meta",
&properties_block_meta);
meta_index_builder->Add(*properties_block_meta, properties_block_handle);
}
}
void BlockBasedTableBuilder::WriteCompressionDictBlock(
MetaIndexBuilder* meta_index_builder) {
if (rep_->compression_dict != nullptr &&
rep_->compression_dict->GetRawDict().size()) {
BlockHandle compression_dict_block_handle;
if (ok()) {
WriteMaybeCompressedBlock(rep_->compression_dict->GetRawDict(),
kNoCompression, &compression_dict_block_handle,
BlockType::kCompressionDictionary);
#ifndef NDEBUG
Slice compression_dict = rep_->compression_dict->GetRawDict();
TEST_SYNC_POINT_CALLBACK(
"BlockBasedTableBuilder::WriteCompressionDictBlock:RawDict",
&compression_dict);
#endif // NDEBUG
}
if (ok()) {
meta_index_builder->Add(kCompressionDictBlockName,
compression_dict_block_handle);
}
}
}
void BlockBasedTableBuilder::WriteRangeDelBlock(
MetaIndexBuilder* meta_index_builder) {
if (ok() && !rep_->range_del_block.empty()) {
BlockHandle range_del_block_handle;
WriteMaybeCompressedBlock(rep_->range_del_block.Finish(), kNoCompression,
&range_del_block_handle,
BlockType::kRangeDeletion);
meta_index_builder->Add(kRangeDelBlockName, range_del_block_handle);
}
}
void BlockBasedTableBuilder::WriteFooter(BlockHandle& metaindex_block_handle,
BlockHandle& index_block_handle) {
assert(ok());
Rep* r = rep_;
// this is guaranteed by BlockBasedTableBuilder's constructor
assert(r->table_options.checksum == kCRC32c ||
r->table_options.format_version != 0);
FooterBuilder footer;
Status s = footer.Build(kBlockBasedTableMagicNumber,
r->table_options.format_version, r->get_offset(),
r->table_options.checksum, metaindex_block_handle,
index_block_handle, r->base_context_checksum);
if (!s.ok()) {
r->SetStatus(s);
return;
}
IOOptions io_options;
IOStatus ios =
WritableFileWriter::PrepareIOOptions(r->write_options, io_options);
if (!ios.ok()) {
r->SetIOStatus(ios);
return;
}
ios = r->file->Append(io_options, footer.GetSlice());
if (ios.ok()) {
r->set_offset(r->get_offset() + footer.GetSlice().size());
} else {
r->SetIOStatus(ios);
}
}
void BlockBasedTableBuilder::EnterUnbuffered() {
Rep* r = rep_;
assert(r->state == Rep::State::kBuffered);
r->state = Rep::State::kUnbuffered;
const size_t kSampleBytes = r->compression_opts.zstd_max_train_bytes > 0
? r->compression_opts.zstd_max_train_bytes
: r->compression_opts.max_dict_bytes;
const size_t kNumBlocksBuffered = r->data_block_buffers.size();
if (kNumBlocksBuffered == 0) {
// The below code is neither safe nor necessary for handling zero data
// blocks.
return;
}
// Abstract algebra teaches us that a finite cyclic group (such as the
// additive group of integers modulo N) can be generated by a number that is
// coprime with N. Since N is variable (number of buffered data blocks), we
// must then pick a prime number in order to guarantee coprimeness with any N.
//
// One downside of this approach is the spread will be poor when
// `kPrimeGeneratorRemainder` is close to zero or close to
// `kNumBlocksBuffered`.
//
// Picked a random number between one and one trillion and then chose the
// next prime number greater than or equal to it.
const uint64_t kPrimeGenerator = 545055921143ull;
// Can avoid repeated division by just adding the remainder repeatedly.
const size_t kPrimeGeneratorRemainder = static_cast<size_t>(
kPrimeGenerator % static_cast<uint64_t>(kNumBlocksBuffered));
const size_t kInitSampleIdx = kNumBlocksBuffered / 2;
std::string compression_dict_samples;
std::vector<size_t> compression_dict_sample_lens;
size_t buffer_idx = kInitSampleIdx;
for (size_t i = 0;
i < kNumBlocksBuffered && compression_dict_samples.size() < kSampleBytes;
++i) {
size_t copy_len = std::min(kSampleBytes - compression_dict_samples.size(),
r->data_block_buffers[buffer_idx].size());
compression_dict_samples.append(r->data_block_buffers[buffer_idx], 0,
copy_len);
compression_dict_sample_lens.emplace_back(copy_len);
buffer_idx += kPrimeGeneratorRemainder;
if (buffer_idx >= kNumBlocksBuffered) {
buffer_idx -= kNumBlocksBuffered;
}
}
// final data block flushed, now we can generate dictionary from the samples.
// OK if compression_dict_samples is empty, we'll just get empty dictionary.
std::string dict;
if (r->compression_opts.zstd_max_train_bytes > 0) {
if (r->compression_opts.use_zstd_dict_trainer) {
dict = ZSTD_TrainDictionary(compression_dict_samples,
compression_dict_sample_lens,
r->compression_opts.max_dict_bytes);
} else {
dict = ZSTD_FinalizeDictionary(
compression_dict_samples, compression_dict_sample_lens,
r->compression_opts.max_dict_bytes, r->compression_opts.level);
}
} else {
dict = std::move(compression_dict_samples);
}
r->compression_dict.reset(new CompressionDict(dict, r->compression_type,
r->compression_opts.level));
r->verify_dict.reset(new UncompressionDict(
dict, r->compression_type == kZSTD ||
r->compression_type == kZSTDNotFinalCompression));
auto get_iterator_for_block = [&r](size_t i) {
auto& data_block = r->data_block_buffers[i];
assert(!data_block.empty());
Block reader{BlockContents{data_block}};
DataBlockIter* iter = reader.NewDataIterator(
r->internal_comparator.user_comparator(), kDisableGlobalSequenceNumber,
nullptr /* iter */, nullptr /* stats */,
false /* block_contents_pinned */, r->persist_user_defined_timestamps);
iter->SeekToFirst();
assert(iter->Valid());
return std::unique_ptr<DataBlockIter>(iter);
};
std::unique_ptr<DataBlockIter> iter = nullptr, next_block_iter = nullptr;
for (size_t i = 0; ok() && i < r->data_block_buffers.size(); ++i) {
if (iter == nullptr) {
iter = get_iterator_for_block(i);
assert(iter != nullptr);
};
if (i + 1 < r->data_block_buffers.size()) {
next_block_iter = get_iterator_for_block(i + 1);
}
auto& data_block = r->data_block_buffers[i];
if (r->IsParallelCompressionEnabled()) {
Slice first_key_in_next_block;
const Slice* first_key_in_next_block_ptr = &first_key_in_next_block;
if (i + 1 < r->data_block_buffers.size()) {
assert(next_block_iter != nullptr);
first_key_in_next_block = next_block_iter->key();
} else {
first_key_in_next_block_ptr = r->first_key_in_next_block;
}
std::vector<std::string> keys;
for (; iter->Valid(); iter->Next()) {
keys.emplace_back(iter->key().ToString());
}
ParallelCompressionRep::BlockRep* block_rep = r->pc_rep->PrepareBlock(
r->compression_type, first_key_in_next_block_ptr, &data_block, &keys);
assert(block_rep != nullptr);
r->pc_rep->file_size_estimator.EmitBlock(block_rep->data->size(),
r->get_offset());
r->pc_rep->EmitBlock(block_rep);
} else {
for (; iter->Valid(); iter->Next()) {
Slice key = iter->key();
if (r->filter_builder != nullptr) {
r->filter_builder->Add(
ExtractUserKeyAndStripTimestamp(key, r->ts_sz));
}
r->index_builder->OnKeyAdded(key);
}
WriteBlock(Slice(data_block), &r->pending_handle, BlockType::kData);
if (ok() && i + 1 < r->data_block_buffers.size()) {
assert(next_block_iter != nullptr);
Slice first_key_in_next_block = next_block_iter->key();
Slice* first_key_in_next_block_ptr = &first_key_in_next_block;
iter->SeekToLast();
std::string last_key = iter->key().ToString();
r->index_builder->AddIndexEntry(&last_key, first_key_in_next_block_ptr,
r->pending_handle);
}
}
std::swap(iter, next_block_iter);
}
r->data_block_buffers.clear();
r->data_begin_offset = 0;
// Release all reserved cache for data block buffers
if (r->compression_dict_buffer_cache_res_mgr != nullptr) {
Status s = r->compression_dict_buffer_cache_res_mgr->UpdateCacheReservation(
r->data_begin_offset);
s.PermitUncheckedError();
}
}
Status BlockBasedTableBuilder::Finish() {
Rep* r = rep_;
assert(r->state != Rep::State::kClosed);
bool empty_data_block = r->data_block.empty();
r->first_key_in_next_block = nullptr;
Flush();
if (r->state == Rep::State::kBuffered) {
EnterUnbuffered();
}
if (r->IsParallelCompressionEnabled()) {
StopParallelCompression();
#ifndef NDEBUG
for (const auto& br : r->pc_rep->block_rep_buf) {
assert(br.status.ok());
}
#endif // !NDEBUG
} else {
// To make sure properties block is able to keep the accurate size of index
// block, we will finish writing all index entries first.
if (ok() && !empty_data_block) {
r->index_builder->AddIndexEntry(
&r->last_key, nullptr /* no next data block */, r->pending_handle);
}
}
r->props.tail_start_offset = r->offset;
// Write meta blocks, metaindex block and footer in the following order.
// 1. [meta block: filter]
// 2. [meta block: index]
// 3. [meta block: compression dictionary]
// 4. [meta block: range deletion tombstone]
// 5. [meta block: properties]
// 6. [metaindex block]
// 7. Footer
BlockHandle metaindex_block_handle, index_block_handle;
MetaIndexBuilder meta_index_builder;
WriteFilterBlock(&meta_index_builder);
WriteIndexBlock(&meta_index_builder, &index_block_handle);
WriteCompressionDictBlock(&meta_index_builder);
WriteRangeDelBlock(&meta_index_builder);
WritePropertiesBlock(&meta_index_builder);
if (ok()) {
// flush the meta index block
WriteMaybeCompressedBlock(meta_index_builder.Finish(), kNoCompression,
&metaindex_block_handle, BlockType::kMetaIndex);
}
if (ok()) {
WriteFooter(metaindex_block_handle, index_block_handle);
}
r->state = Rep::State::kClosed;
r->tail_size = r->offset - r->props.tail_start_offset;
Status ret_status = r->CopyStatus();
IOStatus ios = r->GetIOStatus();
if (!ios.ok() && ret_status.ok()) {
// Let io_status supersede ok status (otherwise status takes precedennce)
ret_status = ios;
}
return ret_status;
}
void BlockBasedTableBuilder::Abandon() {
assert(rep_->state != Rep::State::kClosed);
if (rep_->IsParallelCompressionEnabled()) {
StopParallelCompression();
}
rep_->state = Rep::State::kClosed;
#ifdef ROCKSDB_ASSERT_STATUS_CHECKED // Avoid unnecessary lock acquisition
rep_->CopyStatus().PermitUncheckedError();
rep_->CopyIOStatus().PermitUncheckedError();
#endif // ROCKSDB_ASSERT_STATUS_CHECKED
}
uint64_t BlockBasedTableBuilder::NumEntries() const {
return rep_->props.num_entries;
}
bool BlockBasedTableBuilder::IsEmpty() const {
return rep_->props.num_entries == 0 && rep_->props.num_range_deletions == 0;
}
uint64_t BlockBasedTableBuilder::FileSize() const { return rep_->offset; }
uint64_t BlockBasedTableBuilder::EstimatedFileSize() const {
if (rep_->IsParallelCompressionEnabled()) {
// Use compression ratio so far and inflight uncompressed bytes to estimate
// final SST size.
return rep_->pc_rep->file_size_estimator.GetEstimatedFileSize();
} else {
return FileSize();
}
}
uint64_t BlockBasedTableBuilder::GetTailSize() const { return rep_->tail_size; }
bool BlockBasedTableBuilder::NeedCompact() const {
for (const auto& collector : rep_->table_properties_collectors) {
if (collector->NeedCompact()) {
return true;
}
}
return false;
}
TableProperties BlockBasedTableBuilder::GetTableProperties() const {
return rep_->props;
}
std::string BlockBasedTableBuilder::GetFileChecksum() const {
if (rep_->file != nullptr) {
return rep_->file->GetFileChecksum();
} else {
return kUnknownFileChecksum;
}
}
const char* BlockBasedTableBuilder::GetFileChecksumFuncName() const {
if (rep_->file != nullptr) {
return rep_->file->GetFileChecksumFuncName();
} else {
return kUnknownFileChecksumFuncName;
}
}
void BlockBasedTableBuilder::SetSeqnoTimeTableProperties(
const SeqnoToTimeMapping& relevant_mapping, uint64_t oldest_ancestor_time) {
assert(rep_->props.seqno_to_time_mapping.empty());
relevant_mapping.EncodeTo(rep_->props.seqno_to_time_mapping);
rep_->props.creation_time = oldest_ancestor_time;
}
const std::string BlockBasedTable::kObsoleteFilterBlockPrefix = "filter.";
const std::string BlockBasedTable::kFullFilterBlockPrefix = "fullfilter.";
const std::string BlockBasedTable::kPartitionedFilterBlockPrefix =
"partitionedfilter.";
} // namespace ROCKSDB_NAMESPACE
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