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rocksdb/table/meta_blocks.cc

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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).
#include "table/meta_blocks.h"
#include <map>
#include <string>
#include "block_fetcher.h"
#include "db/table_properties_collector.h"
#include "file/random_access_file_reader.h"
#include "logging/logging.h"
#include "rocksdb/options.h"
#include "rocksdb/table.h"
#include "rocksdb/table_properties.h"
#include "table/block_based/block.h"
#include "table/block_based/reader_common.h"
#include "table/format.h"
#include "table/internal_iterator.h"
#include "table/persistent_cache_helper.h"
#include "table/sst_file_writer_collectors.h"
#include "table/table_properties_internal.h"
#include "test_util/sync_point.h"
#include "util/coding.h"
namespace ROCKSDB_NAMESPACE {
const std::string kPropertiesBlockName = "rocksdb.properties";
// NB: only used with format_version >= 6
const std::string kIndexBlockName = "rocksdb.index";
// Old property block name for backward compatibility
const std::string kPropertiesBlockOldName = "rocksdb.stats";
const std::string kCompressionDictBlockName = "rocksdb.compression_dict";
const std::string kRangeDelBlockName = "rocksdb.range_del";
MetaIndexBuilder::MetaIndexBuilder()
: meta_index_block_(new BlockBuilder(1 /* restart interval */)) {}
void MetaIndexBuilder::Add(const std::string& key, const BlockHandle& handle) {
std::string handle_encoding;
handle.EncodeTo(&handle_encoding);
meta_block_handles_.insert({key, handle_encoding});
}
Slice MetaIndexBuilder::Finish() {
for (const auto& metablock : meta_block_handles_) {
meta_index_block_->Add(metablock.first, metablock.second);
}
return meta_index_block_->Finish();
}
// Property block will be read sequentially and cached in a heap located
// object, so there's no need for restart points. Thus we set the restart
// interval to infinity to save space.
PropertyBlockBuilder::PropertyBlockBuilder()
: properties_block_(new BlockBuilder(
std::numeric_limits<int32_t>::max() /* restart interval */)) {}
void PropertyBlockBuilder::Add(const std::string& name,
const std::string& val) {
assert(props_.find(name) == props_.end());
props_.insert({name, val});
}
void PropertyBlockBuilder::Add(const std::string& name, uint64_t val) {
std::string dst;
PutVarint64(&dst, val);
Add(name, dst);
}
void PropertyBlockBuilder::Add(
const UserCollectedProperties& user_collected_properties) {
for (const auto& prop : user_collected_properties) {
Add(prop.first, prop.second);
}
}
void PropertyBlockBuilder::AddTableProperty(const TableProperties& props) {
TEST_SYNC_POINT_CALLBACK("PropertyBlockBuilder::AddTableProperty:Start",
const_cast<TableProperties*>(&props));
Add(TablePropertiesNames::kOriginalFileNumber, props.orig_file_number);
Add(TablePropertiesNames::kRawKeySize, props.raw_key_size);
Add(TablePropertiesNames::kRawValueSize, props.raw_value_size);
Add(TablePropertiesNames::kDataSize, props.data_size);
Add(TablePropertiesNames::kIndexSize, props.index_size);
if (props.index_partitions != 0) {
Add(TablePropertiesNames::kIndexPartitions, props.index_partitions);
Add(TablePropertiesNames::kTopLevelIndexSize, props.top_level_index_size);
}
Add(TablePropertiesNames::kIndexKeyIsUserKey, props.index_key_is_user_key);
Add(TablePropertiesNames::kIndexValueIsDeltaEncoded,
props.index_value_is_delta_encoded);
Add(TablePropertiesNames::kNumEntries, props.num_entries);
Add(TablePropertiesNames::kNumFilterEntries, props.num_filter_entries);
Add(TablePropertiesNames::kDeletedKeys, props.num_deletions);
Add(TablePropertiesNames::kMergeOperands, props.num_merge_operands);
Add(TablePropertiesNames::kNumRangeDeletions, props.num_range_deletions);
Add(TablePropertiesNames::kNumDataBlocks, props.num_data_blocks);
Add(TablePropertiesNames::kFilterSize, props.filter_size);
Add(TablePropertiesNames::kFormatVersion, props.format_version);
Add(TablePropertiesNames::kFixedKeyLen, props.fixed_key_len);
Add(TablePropertiesNames::kColumnFamilyId, props.column_family_id);
Add(TablePropertiesNames::kCreationTime, props.creation_time);
Add(TablePropertiesNames::kOldestKeyTime, props.oldest_key_time);
if (props.file_creation_time > 0) {
Add(TablePropertiesNames::kFileCreationTime, props.file_creation_time);
}
if (props.slow_compression_estimated_data_size > 0) {
Add(TablePropertiesNames::kSlowCompressionEstimatedDataSize,
props.slow_compression_estimated_data_size);
}
if (props.fast_compression_estimated_data_size > 0) {
Add(TablePropertiesNames::kFastCompressionEstimatedDataSize,
props.fast_compression_estimated_data_size);
}
Add(TablePropertiesNames::kTailStartOffset, props.tail_start_offset);
if (props.user_defined_timestamps_persisted == 0) {
Add(TablePropertiesNames::kUserDefinedTimestampsPersisted,
props.user_defined_timestamps_persisted);
}
if (!props.db_id.empty()) {
Add(TablePropertiesNames::kDbId, props.db_id);
}
if (!props.db_session_id.empty()) {
Add(TablePropertiesNames::kDbSessionId, props.db_session_id);
}
if (!props.db_host_id.empty()) {
Add(TablePropertiesNames::kDbHostId, props.db_host_id);
}
if (!props.filter_policy_name.empty()) {
Add(TablePropertiesNames::kFilterPolicy, props.filter_policy_name);
}
if (!props.comparator_name.empty()) {
Add(TablePropertiesNames::kComparator, props.comparator_name);
}
if (!props.merge_operator_name.empty()) {
Add(TablePropertiesNames::kMergeOperator, props.merge_operator_name);
}
if (!props.prefix_extractor_name.empty()) {
Add(TablePropertiesNames::kPrefixExtractorName,
props.prefix_extractor_name);
}
if (!props.property_collectors_names.empty()) {
Add(TablePropertiesNames::kPropertyCollectors,
props.property_collectors_names);
}
if (!props.column_family_name.empty()) {
Add(TablePropertiesNames::kColumnFamilyName, props.column_family_name);
}
if (!props.compression_name.empty()) {
Add(TablePropertiesNames::kCompression, props.compression_name);
}
if (!props.compression_options.empty()) {
Add(TablePropertiesNames::kCompressionOptions, props.compression_options);
}
if (!props.seqno_to_time_mapping.empty()) {
Add(TablePropertiesNames::kSequenceNumberTimeMapping,
props.seqno_to_time_mapping);
}
if (props.key_largest_seqno != UINT64_MAX) {
Add(TablePropertiesNames::kKeyLargestSeqno, props.key_largest_seqno);
}
}
Slice PropertyBlockBuilder::Finish() {
for (const auto& prop : props_) {
assert(last_prop_added_to_block_.empty() ||
comparator_->Compare(prop.first, last_prop_added_to_block_) > 0);
properties_block_->Add(prop.first, prop.second);
#ifndef NDEBUG
last_prop_added_to_block_ = prop.first;
#endif /* !NDEBUG */
}
return properties_block_->Finish();
}
void LogPropertiesCollectionError(Logger* info_log, const std::string& method,
const std::string& name) {
assert(method == "Add" || method == "Finish");
std::string msg =
"Encountered error when calling TablePropertiesCollector::" + method +
"() with collector name: " + name;
ROCKS_LOG_ERROR(info_log, "%s", msg.c_str());
}
bool NotifyCollectTableCollectorsOnAdd(
const Slice& key, const Slice& value, uint64_t file_size,
const std::vector<std::unique_ptr<InternalTblPropColl>>& collectors,
Logger* info_log) {
bool all_succeeded = true;
for (auto& collector : collectors) {
Status s = collector->InternalAdd(key, value, file_size);
all_succeeded = all_succeeded && s.ok();
if (!s.ok()) {
LogPropertiesCollectionError(info_log, "Add" /* method */,
collector->Name());
}
}
return all_succeeded;
}
void NotifyCollectTableCollectorsOnBlockAdd(
const std::vector<std::unique_ptr<InternalTblPropColl>>& collectors,
const uint64_t block_uncomp_bytes,
const uint64_t block_compressed_bytes_fast,
const uint64_t block_compressed_bytes_slow) {
for (auto& collector : collectors) {
collector->BlockAdd(block_uncomp_bytes, block_compressed_bytes_fast,
block_compressed_bytes_slow);
}
}
bool NotifyCollectTableCollectorsOnFinish(
const std::vector<std::unique_ptr<InternalTblPropColl>>& collectors,
Logger* info_log, PropertyBlockBuilder* builder,
UserCollectedProperties& user_collected_properties,
UserCollectedProperties& readable_properties) {
bool all_succeeded = true;
for (auto& collector : collectors) {
UserCollectedProperties user_properties;
Status s = collector->Finish(&user_properties);
if (s.ok()) {
for (const auto& prop : collector->GetReadableProperties()) {
readable_properties.insert(prop);
}
#ifndef NDEBUG
// Check different user properties collectors are not adding properties of
// the same name.
for (const auto& pair : user_properties) {
assert(user_collected_properties.find(pair.first) ==
user_collected_properties.end());
}
#endif /* !NDEBUG */
user_collected_properties.merge(user_properties);
} else {
LogPropertiesCollectionError(info_log, "Finish" /* method */,
collector->Name());
if (all_succeeded) {
all_succeeded = false;
}
}
}
builder->Add(user_collected_properties);
return all_succeeded;
}
// FIXME: should be a parameter for reading table properties to use persistent
// cache?
Status ReadTablePropertiesHelper(
const ReadOptions& ro, const BlockHandle& handle,
RandomAccessFileReader* file, FilePrefetchBuffer* prefetch_buffer,
const Footer& footer, const ImmutableOptions& ioptions,
std::unique_ptr<TableProperties>* table_properties,
MemoryAllocator* memory_allocator) {
assert(table_properties);
Status s;
bool retry = false;
while (true) {
BlockContents block_contents;
size_t len = handle.size() + footer.GetBlockTrailerSize();
// If this is an external SST file ingested with write_global_seqno set to
// true, then we expect the checksum mismatch because checksum was written
// by SstFileWriter, but its global seqno in the properties block may have
// been changed during ingestion. For this reason, we initially read
// and process without checksum verification, then later try checksum
// verification so that if it fails, we can copy to a temporary buffer with
// global seqno set to its original value, i.e. 0, and attempt checksum
// verification again.
if (!retry) {
ReadOptions modified_ro = ro;
modified_ro.verify_checksums = false;
BlockFetcher block_fetcher(
file, prefetch_buffer, footer, modified_ro, handle, &block_contents,
ioptions, false /* decompress */, false /*maybe_compressed*/,
BlockType::kProperties, UncompressionDict::GetEmptyDict(),
PersistentCacheOptions::kEmpty, memory_allocator);
s = block_fetcher.ReadBlockContents();
if (!s.ok()) {
return s;
}
assert(block_fetcher.GetBlockSizeWithTrailer() == len);
TEST_SYNC_POINT_CALLBACK("ReadTablePropertiesHelper:0",
&block_contents.data);
} else {
assert(s.IsCorruption());
// If retrying, use a stronger file system read to check and correct
// data corruption
IOOptions opts;
if (PrepareIOFromReadOptions(ro, ioptions.clock, opts) !=
IOStatus::OK()) {
return s;
}
opts.verify_and_reconstruct_read = true;
std::unique_ptr<char[]> data(new char[len]);
Slice result;
IOStatus io_s =
file->Read(opts, handle.offset(), len, &result, data.get(), nullptr);
RecordTick(ioptions.stats, FILE_READ_CORRUPTION_RETRY_COUNT);
if (!io_s.ok()) {
ROCKS_LOG_INFO(ioptions.info_log,
"Reading properties block failed - %s",
io_s.ToString().c_str());
// Return the original corruption error as that's more serious
return s;
}
if (result.size() < len) {
return Status::Corruption("Reading properties block failed - " +
std::to_string(result.size()) +
" bytes read");
}
RecordTick(ioptions.stats, FILE_READ_CORRUPTION_RETRY_SUCCESS_COUNT);
block_contents = BlockContents(std::move(data), handle.size());
}
uint64_t block_size = block_contents.data.size();
Block properties_block(std::move(block_contents));
// Unfortunately, Block::size() might not equal block_contents.data.size(),
// and Block hides block_contents
std::unique_ptr<MetaBlockIter> iter(properties_block.NewMetaIterator());
std::unique_ptr<TableProperties> new_table_properties{new TableProperties};
// All pre-defined properties of type uint64_t
std::unordered_map<std::string, uint64_t*> predefined_uint64_properties = {
{TablePropertiesNames::kOriginalFileNumber,
&new_table_properties->orig_file_number},
{TablePropertiesNames::kDataSize, &new_table_properties->data_size},
{TablePropertiesNames::kIndexSize, &new_table_properties->index_size},
{TablePropertiesNames::kIndexPartitions,
&new_table_properties->index_partitions},
{TablePropertiesNames::kTopLevelIndexSize,
&new_table_properties->top_level_index_size},
{TablePropertiesNames::kIndexKeyIsUserKey,
&new_table_properties->index_key_is_user_key},
{TablePropertiesNames::kIndexValueIsDeltaEncoded,
&new_table_properties->index_value_is_delta_encoded},
{TablePropertiesNames::kFilterSize, &new_table_properties->filter_size},
{TablePropertiesNames::kRawKeySize,
&new_table_properties->raw_key_size},
{TablePropertiesNames::kRawValueSize,
&new_table_properties->raw_value_size},
{TablePropertiesNames::kNumDataBlocks,
&new_table_properties->num_data_blocks},
{TablePropertiesNames::kNumEntries, &new_table_properties->num_entries},
{TablePropertiesNames::kNumFilterEntries,
&new_table_properties->num_filter_entries},
{TablePropertiesNames::kDeletedKeys,
&new_table_properties->num_deletions},
{TablePropertiesNames::kMergeOperands,
&new_table_properties->num_merge_operands},
{TablePropertiesNames::kNumRangeDeletions,
&new_table_properties->num_range_deletions},
{TablePropertiesNames::kFormatVersion,
&new_table_properties->format_version},
{TablePropertiesNames::kFixedKeyLen,
&new_table_properties->fixed_key_len},
{TablePropertiesNames::kColumnFamilyId,
&new_table_properties->column_family_id},
{TablePropertiesNames::kCreationTime,
&new_table_properties->creation_time},
{TablePropertiesNames::kOldestKeyTime,
&new_table_properties->oldest_key_time},
{TablePropertiesNames::kFileCreationTime,
&new_table_properties->file_creation_time},
{TablePropertiesNames::kSlowCompressionEstimatedDataSize,
&new_table_properties->slow_compression_estimated_data_size},
{TablePropertiesNames::kFastCompressionEstimatedDataSize,
&new_table_properties->fast_compression_estimated_data_size},
{TablePropertiesNames::kTailStartOffset,
&new_table_properties->tail_start_offset},
{TablePropertiesNames::kUserDefinedTimestampsPersisted,
&new_table_properties->user_defined_timestamps_persisted},
{TablePropertiesNames::kKeyLargestSeqno,
&new_table_properties->key_largest_seqno},
};
std::string last_key;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
s = iter->status();
if (!s.ok()) {
break;
}
auto key = iter->key().ToString();
// properties block should be strictly sorted with no duplicate key.
if (!last_key.empty() &&
BytewiseComparator()->Compare(key, last_key) <= 0) {
s = Status::Corruption("properties unsorted");
break;
}
last_key = key;
auto raw_val = iter->value();
auto pos = predefined_uint64_properties.find(key);
if (key == ExternalSstFilePropertyNames::kGlobalSeqno) {
new_table_properties->external_sst_file_global_seqno_offset =
handle.offset() + iter->ValueOffset();
}
if (pos != predefined_uint64_properties.end()) {
if (key == TablePropertiesNames::kDeletedKeys ||
key == TablePropertiesNames::kMergeOperands) {
// Insert in user-collected properties for API backwards compatibility
new_table_properties->user_collected_properties.insert(
{key, raw_val.ToString()});
}
// handle predefined rocksdb properties
uint64_t val;
if (!GetVarint64(&raw_val, &val)) {
// skip malformed value
auto error_msg =
"Detect malformed value in properties meta-block:"
"\tkey: " +
key + "\tval: " + raw_val.ToString();
ROCKS_LOG_ERROR(ioptions.logger, "%s", error_msg.c_str());
continue;
}
*(pos->second) = val;
} else if (key == TablePropertiesNames::kDbId) {
new_table_properties->db_id = raw_val.ToString();
} else if (key == TablePropertiesNames::kDbSessionId) {
new_table_properties->db_session_id = raw_val.ToString();
} else if (key == TablePropertiesNames::kDbHostId) {
new_table_properties->db_host_id = raw_val.ToString();
} else if (key == TablePropertiesNames::kFilterPolicy) {
new_table_properties->filter_policy_name = raw_val.ToString();
} else if (key == TablePropertiesNames::kColumnFamilyName) {
new_table_properties->column_family_name = raw_val.ToString();
} else if (key == TablePropertiesNames::kComparator) {
new_table_properties->comparator_name = raw_val.ToString();
} else if (key == TablePropertiesNames::kMergeOperator) {
new_table_properties->merge_operator_name = raw_val.ToString();
} else if (key == TablePropertiesNames::kPrefixExtractorName) {
new_table_properties->prefix_extractor_name = raw_val.ToString();
} else if (key == TablePropertiesNames::kPropertyCollectors) {
new_table_properties->property_collectors_names = raw_val.ToString();
} else if (key == TablePropertiesNames::kCompression) {
new_table_properties->compression_name = raw_val.ToString();
} else if (key == TablePropertiesNames::kCompressionOptions) {
new_table_properties->compression_options = raw_val.ToString();
} else if (key == TablePropertiesNames::kSequenceNumberTimeMapping) {
new_table_properties->seqno_to_time_mapping = raw_val.ToString();
} else {
// handle user-collected properties
new_table_properties->user_collected_properties.insert(
{key, raw_val.ToString()});
}
}
// Modified version of BlockFetcher checksum verification
// (See write_global_seqno comment above)
if (s.ok() && footer.GetBlockTrailerSize() > 0) {
s = VerifyBlockChecksum(footer, properties_block.data(), block_size,
file->file_name(), handle.offset());
if (s.IsCorruption()) {
if (new_table_properties->external_sst_file_global_seqno_offset != 0) {
std::string tmp_buf(properties_block.data(), len);
uint64_t global_seqno_offset =
new_table_properties->external_sst_file_global_seqno_offset -
handle.offset();
EncodeFixed64(&tmp_buf[static_cast<size_t>(global_seqno_offset)], 0);
s = VerifyBlockChecksum(footer, tmp_buf.data(), block_size,
file->file_name(), handle.offset());
}
}
}
// If we detected a corruption and the file system supports verification
// and reconstruction, retry the read
if (s.IsCorruption() && !retry &&
CheckFSFeatureSupport(ioptions.fs.get(),
FSSupportedOps::kVerifyAndReconstructRead)) {
retry = true;
} else {
if (s.ok()) {
*table_properties = std::move(new_table_properties);
}
break;
}
}
return s;
}
Status ReadTableProperties(RandomAccessFileReader* file, uint64_t file_size,
uint64_t table_magic_number,
const ImmutableOptions& ioptions,
const ReadOptions& read_options,
std::unique_ptr<TableProperties>* properties,
MemoryAllocator* memory_allocator,
FilePrefetchBuffer* prefetch_buffer) {
BlockHandle block_handle;
Footer footer;
Status s =
FindMetaBlockInFile(file, file_size, table_magic_number, ioptions,
read_options, kPropertiesBlockName, &block_handle,
memory_allocator, prefetch_buffer, &footer);
if (!s.ok()) {
return s;
}
if (!block_handle.IsNull()) {
s = ReadTablePropertiesHelper(read_options, block_handle, file,
prefetch_buffer, footer, ioptions, properties,
memory_allocator);
} else {
s = Status::NotFound();
}
return s;
}
Status FindOptionalMetaBlock(InternalIterator* meta_index_iter,
const std::string& meta_block_name,
BlockHandle* block_handle) {
assert(block_handle != nullptr);
meta_index_iter->Seek(meta_block_name);
if (meta_index_iter->status().ok()) {
if (meta_index_iter->Valid() && meta_index_iter->key() == meta_block_name) {
Slice v = meta_index_iter->value();
return block_handle->DecodeFrom(&v);
} else if (meta_block_name == kPropertiesBlockName) {
// Have to try old name for compatibility
meta_index_iter->Seek(kPropertiesBlockOldName);
if (meta_index_iter->status().ok() && meta_index_iter->Valid() &&
meta_index_iter->key() == kPropertiesBlockOldName) {
Slice v = meta_index_iter->value();
return block_handle->DecodeFrom(&v);
}
}
}
// else
*block_handle = BlockHandle::NullBlockHandle();
return meta_index_iter->status();
}
Status FindMetaBlock(InternalIterator* meta_index_iter,
const std::string& meta_block_name,
BlockHandle* block_handle) {
Status s =
FindOptionalMetaBlock(meta_index_iter, meta_block_name, block_handle);
if (s.ok() && block_handle->IsNull()) {
return Status::Corruption("Cannot find the meta block", meta_block_name);
} else {
return s;
}
}
Status ReadMetaIndexBlockInFile(RandomAccessFileReader* file,
uint64_t file_size, uint64_t table_magic_number,
const ImmutableOptions& ioptions,
const ReadOptions& read_options,
BlockContents* metaindex_contents,
MemoryAllocator* memory_allocator,
FilePrefetchBuffer* prefetch_buffer,
Footer* footer_out) {
Footer footer;
IOOptions opts;
Status s;
s = file->PrepareIOOptions(read_options, opts);
if (!s.ok()) {
return s;
}
s = ReadFooterFromFile(opts, file, *ioptions.fs, prefetch_buffer, file_size,
&footer, table_magic_number);
if (!s.ok()) {
return s;
}
if (footer_out) {
*footer_out = footer;
}
auto metaindex_handle = footer.metaindex_handle();
return BlockFetcher(file, prefetch_buffer, footer, read_options,
metaindex_handle, metaindex_contents, ioptions,
false /* do decompression */, false /*maybe_compressed*/,
BlockType::kMetaIndex, UncompressionDict::GetEmptyDict(),
PersistentCacheOptions::kEmpty, memory_allocator)
.ReadBlockContents();
}
Status FindMetaBlockInFile(
RandomAccessFileReader* file, uint64_t file_size,
uint64_t table_magic_number, const ImmutableOptions& ioptions,
const ReadOptions& read_options, const std::string& meta_block_name,
BlockHandle* block_handle, MemoryAllocator* memory_allocator,
FilePrefetchBuffer* prefetch_buffer, Footer* footer_out) {
BlockContents metaindex_contents;
auto s = ReadMetaIndexBlockInFile(
file, file_size, table_magic_number, ioptions, read_options,
&metaindex_contents, memory_allocator, prefetch_buffer, footer_out);
if (!s.ok()) {
return s;
}
// meta blocks are never compressed. Need to add uncompress logic if we are to
// compress it.
Block metaindex_block(std::move(metaindex_contents));
std::unique_ptr<InternalIterator> meta_iter;
meta_iter.reset(metaindex_block.NewMetaIterator());
return FindMetaBlock(meta_iter.get(), meta_block_name, block_handle);
}
Status ReadMetaBlock(RandomAccessFileReader* file,
FilePrefetchBuffer* prefetch_buffer, uint64_t file_size,
uint64_t table_magic_number,
const ImmutableOptions& ioptions,
const ReadOptions& read_options,
const std::string& meta_block_name, BlockType block_type,
BlockContents* contents,
MemoryAllocator* memory_allocator) {
// TableProperties requires special handling because of checksum issues.
// Call ReadTableProperties instead for that case.
assert(block_type != BlockType::kProperties);
BlockHandle block_handle;
Footer footer;
Status status =
FindMetaBlockInFile(file, file_size, table_magic_number, ioptions,
read_options, meta_block_name, &block_handle,
memory_allocator, prefetch_buffer, &footer);
if (!status.ok()) {
return status;
}
return BlockFetcher(file, prefetch_buffer, footer, read_options, block_handle,
contents, ioptions, false /* decompress */,
false /*maybe_compressed*/, block_type,
UncompressionDict::GetEmptyDict(),
PersistentCacheOptions::kEmpty, memory_allocator)
.ReadBlockContents();
}
} // namespace ROCKSDB_NAMESPACE
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