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rocksdb/table/plain/plain_table_reader.cc
Siying Dong 8843129ece Move some memory related files from util/ to memory/ (#5382) 
Summary:
Move arena, allocator, and memory tools under util to a separate memory/ directory.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5382

Differential Revision: D15564655

Pulled By: siying

fbshipit-source-id: 9cd6b5d0d3d52b39606e19221fa154596e5852a5
2019-05-30 17:44:09 -07:00

763 lines
24 KiB
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// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
// 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.
#ifndef ROCKSDB_LITE
#include "table/plain/plain_table_reader.h"
#include <string>
#include <vector>
#include "db/dbformat.h"
#include "rocksdb/cache.h"
#include "rocksdb/comparator.h"
#include "rocksdb/env.h"
#include "rocksdb/filter_policy.h"
#include "rocksdb/options.h"
#include "rocksdb/statistics.h"
#include "table/block_based/block.h"
#include "table/block_based/filter_block.h"
#include "table/bloom_block.h"
#include "table/format.h"
#include "table/get_context.h"
#include "table/internal_iterator.h"
#include "table/meta_blocks.h"
#include "table/plain/plain_table_factory.h"
#include "table/plain/plain_table_key_coding.h"
#include "table/two_level_iterator.h"
#include "memory/arena.h"
#include "monitoring/histogram.h"
#include "monitoring/perf_context_imp.h"
#include "util/coding.h"
#include "util/dynamic_bloom.h"
#include "util/hash.h"
#include "util/murmurhash.h"
#include "util/stop_watch.h"
#include "util/string_util.h"
namespace rocksdb {
namespace {
// Safely getting a uint32_t element from a char array, where, starting from
// `base`, every 4 bytes are considered as an fixed 32 bit integer.
inline uint32_t GetFixed32Element(const char* base, size_t offset) {
return DecodeFixed32(base + offset * sizeof(uint32_t));
}
} // namespace
// Iterator to iterate IndexedTable
class PlainTableIterator : public InternalIterator {
public:
explicit PlainTableIterator(PlainTableReader* table, bool use_prefix_seek);
~PlainTableIterator() override;
bool Valid() const override;
void SeekToFirst() override;
void SeekToLast() override;
void Seek(const Slice& target) override;
void SeekForPrev(const Slice& target) override;
void Next() override;
void Prev() override;
Slice key() const override;
Slice value() const override;
Status status() const override;
private:
PlainTableReader* table_;
PlainTableKeyDecoder decoder_;
bool use_prefix_seek_;
uint32_t offset_;
uint32_t next_offset_;
Slice key_;
Slice value_;
Status status_;
// No copying allowed
PlainTableIterator(const PlainTableIterator&) = delete;
void operator=(const Iterator&) = delete;
};
extern const uint64_t kPlainTableMagicNumber;
PlainTableReader::PlainTableReader(
const ImmutableCFOptions& ioptions,
std::unique_ptr<RandomAccessFileReader>&& file,
const EnvOptions& storage_options, const InternalKeyComparator& icomparator,
EncodingType encoding_type, uint64_t file_size,
const TableProperties* table_properties,
const SliceTransform* prefix_extractor)
: internal_comparator_(icomparator),
encoding_type_(encoding_type),
full_scan_mode_(false),
user_key_len_(static_cast<uint32_t>(table_properties->fixed_key_len)),
prefix_extractor_(prefix_extractor),
enable_bloom_(false),
bloom_(6),
file_info_(std::move(file), storage_options,
static_cast<uint32_t>(table_properties->data_size)),
ioptions_(ioptions),
file_size_(file_size),
table_properties_(nullptr) {}
PlainTableReader::~PlainTableReader() {
}
Status PlainTableReader::Open(
const ImmutableCFOptions& ioptions, const EnvOptions& env_options,
const InternalKeyComparator& internal_comparator,
std::unique_ptr<RandomAccessFileReader>&& file, uint64_t file_size,
std::unique_ptr<TableReader>* table_reader, const int bloom_bits_per_key,
double hash_table_ratio, size_t index_sparseness, size_t huge_page_tlb_size,
bool full_scan_mode, const bool immortal_table,
const SliceTransform* prefix_extractor) {
if (file_size > PlainTableIndex::kMaxFileSize) {
return Status::NotSupported("File is too large for PlainTableReader!");
}
TableProperties* props = nullptr;
auto s = ReadTableProperties(file.get(), file_size, kPlainTableMagicNumber,
ioptions, &props,
true /* compression_type_missing */);
if (!s.ok()) {
return s;
}
assert(hash_table_ratio >= 0.0);
auto& user_props = props->user_collected_properties;
auto prefix_extractor_in_file = props->prefix_extractor_name;
if (!full_scan_mode &&
!prefix_extractor_in_file.empty() /* old version sst file*/
&& prefix_extractor_in_file != "nullptr") {
if (!prefix_extractor) {
return Status::InvalidArgument(
"Prefix extractor is missing when opening a PlainTable built "
"using a prefix extractor");
} else if (prefix_extractor_in_file.compare(prefix_extractor->Name()) !=
0) {
return Status::InvalidArgument(
"Prefix extractor given doesn't match the one used to build "
"PlainTable");
}
}
EncodingType encoding_type = kPlain;
auto encoding_type_prop =
user_props.find(PlainTablePropertyNames::kEncodingType);
if (encoding_type_prop != user_props.end()) {
encoding_type = static_cast<EncodingType>(
DecodeFixed32(encoding_type_prop->second.c_str()));
}
std::unique_ptr<PlainTableReader> new_reader(new PlainTableReader(
ioptions, std::move(file), env_options, internal_comparator,
encoding_type, file_size, props, prefix_extractor));
s = new_reader->MmapDataIfNeeded();
if (!s.ok()) {
return s;
}
if (!full_scan_mode) {
s = new_reader->PopulateIndex(props, bloom_bits_per_key, hash_table_ratio,
index_sparseness, huge_page_tlb_size);
if (!s.ok()) {
return s;
}
} else {
// Flag to indicate it is a full scan mode so that none of the indexes
// can be used.
new_reader->full_scan_mode_ = true;
}
if (immortal_table && new_reader->file_info_.is_mmap_mode) {
new_reader->dummy_cleanable_.reset(new Cleanable());
}
*table_reader = std::move(new_reader);
return s;
}
void PlainTableReader::SetupForCompaction() {
}
InternalIterator* PlainTableReader::NewIterator(
const ReadOptions& options, const SliceTransform* /* prefix_extractor */,
Arena* arena, bool /*skip_filters*/, bool /*for_compaction*/) {
bool use_prefix_seek = !IsTotalOrderMode() && !options.total_order_seek;
if (arena == nullptr) {
return new PlainTableIterator(this, use_prefix_seek);
} else {
auto mem = arena->AllocateAligned(sizeof(PlainTableIterator));
return new (mem) PlainTableIterator(this, use_prefix_seek);
}
}
Status PlainTableReader::PopulateIndexRecordList(
PlainTableIndexBuilder* index_builder,
std::vector<uint32_t>* prefix_hashes) {
Slice prev_key_prefix_slice;
std::string prev_key_prefix_buf;
uint32_t pos = data_start_offset_;
bool is_first_record = true;
Slice key_prefix_slice;
PlainTableKeyDecoder decoder(&file_info_, encoding_type_, user_key_len_,
prefix_extractor_);
while (pos < file_info_.data_end_offset) {
uint32_t key_offset = pos;
ParsedInternalKey key;
Slice value_slice;
bool seekable = false;
Status s = Next(&decoder, &pos, &key, nullptr, &value_slice, &seekable);
if (!s.ok()) {
return s;
}
key_prefix_slice = GetPrefix(key);
if (enable_bloom_) {
bloom_.AddHash(GetSliceHash(key.user_key));
} else {
if (is_first_record || prev_key_prefix_slice != key_prefix_slice) {
if (!is_first_record) {
prefix_hashes->push_back(GetSliceHash(prev_key_prefix_slice));
}
if (file_info_.is_mmap_mode) {
prev_key_prefix_slice = key_prefix_slice;
} else {
prev_key_prefix_buf = key_prefix_slice.ToString();
prev_key_prefix_slice = prev_key_prefix_buf;
}
}
}
index_builder->AddKeyPrefix(GetPrefix(key), key_offset);
if (!seekable && is_first_record) {
return Status::Corruption("Key for a prefix is not seekable");
}
is_first_record = false;
}
prefix_hashes->push_back(GetSliceHash(key_prefix_slice));
auto s = index_.InitFromRawData(index_builder->Finish());
return s;
}
void PlainTableReader::AllocateAndFillBloom(
int bloom_bits_per_key, int num_prefixes, size_t huge_page_tlb_size,
std::vector<uint32_t>* prefix_hashes) {
if (!IsTotalOrderMode()) {
uint32_t bloom_total_bits = num_prefixes * bloom_bits_per_key;
if (bloom_total_bits > 0) {
enable_bloom_ = true;
bloom_.SetTotalBits(&arena_, bloom_total_bits, ioptions_.bloom_locality,
huge_page_tlb_size, ioptions_.info_log);
FillBloom(prefix_hashes);
}
}
}
void PlainTableReader::FillBloom(std::vector<uint32_t>* prefix_hashes) {
assert(bloom_.IsInitialized());
for (auto prefix_hash : *prefix_hashes) {
bloom_.AddHash(prefix_hash);
}
}
Status PlainTableReader::MmapDataIfNeeded() {
if (file_info_.is_mmap_mode) {
// Get mmapped memory.
return file_info_.file->Read(0, static_cast<size_t>(file_size_), &file_info_.file_data, nullptr);
}
return Status::OK();
}
Status PlainTableReader::PopulateIndex(TableProperties* props,
int bloom_bits_per_key,
double hash_table_ratio,
size_t index_sparseness,
size_t huge_page_tlb_size) {
assert(props != nullptr);
table_properties_.reset(props);
BlockContents index_block_contents;
Status s = ReadMetaBlock(file_info_.file.get(), nullptr /* prefetch_buffer */,
file_size_, kPlainTableMagicNumber, ioptions_,
PlainTableIndexBuilder::kPlainTableIndexBlock,
&index_block_contents,
true /* compression_type_missing */);
bool index_in_file = s.ok();
BlockContents bloom_block_contents;
bool bloom_in_file = false;
// We only need to read the bloom block if index block is in file.
if (index_in_file) {
s = ReadMetaBlock(file_info_.file.get(), nullptr /* prefetch_buffer */,
file_size_, kPlainTableMagicNumber, ioptions_,
BloomBlockBuilder::kBloomBlock, &bloom_block_contents,
true /* compression_type_missing */);
bloom_in_file = s.ok() && bloom_block_contents.data.size() > 0;
}
Slice* bloom_block;
if (bloom_in_file) {
// If bloom_block_contents.allocation is not empty (which will be the case
// for non-mmap mode), it holds the alloated memory for the bloom block.
// It needs to be kept alive to keep `bloom_block` valid.
bloom_block_alloc_ = std::move(bloom_block_contents.allocation);
bloom_block = &bloom_block_contents.data;
} else {
bloom_block = nullptr;
}
Slice* index_block;
if (index_in_file) {
// If index_block_contents.allocation is not empty (which will be the case
// for non-mmap mode), it holds the alloated memory for the index block.
// It needs to be kept alive to keep `index_block` valid.
index_block_alloc_ = std::move(index_block_contents.allocation);
index_block = &index_block_contents.data;
} else {
index_block = nullptr;
}
if ((prefix_extractor_ == nullptr) && (hash_table_ratio != 0)) {
// moptions.prefix_extractor is requried for a hash-based look-up.
return Status::NotSupported(
"PlainTable requires a prefix extractor enable prefix hash mode.");
}
// First, read the whole file, for every kIndexIntervalForSamePrefixKeys rows
// for a prefix (starting from the first one), generate a record of (hash,
// offset) and append it to IndexRecordList, which is a data structure created
// to store them.
if (!index_in_file) {
// Allocate bloom filter here for total order mode.
if (IsTotalOrderMode()) {
uint32_t num_bloom_bits =
static_cast<uint32_t>(table_properties_->num_entries) *
bloom_bits_per_key;
if (num_bloom_bits > 0) {
enable_bloom_ = true;
bloom_.SetTotalBits(&arena_, num_bloom_bits, ioptions_.bloom_locality,
huge_page_tlb_size, ioptions_.info_log);
}
}
} else if (bloom_in_file) {
enable_bloom_ = true;
auto num_blocks_property = props->user_collected_properties.find(
PlainTablePropertyNames::kNumBloomBlocks);
uint32_t num_blocks = 0;
if (num_blocks_property != props->user_collected_properties.end()) {
Slice temp_slice(num_blocks_property->second);
if (!GetVarint32(&temp_slice, &num_blocks)) {
num_blocks = 0;
}
}
// cast away const qualifier, because bloom_ won't be changed
bloom_.SetRawData(
const_cast<unsigned char*>(
reinterpret_cast<const unsigned char*>(bloom_block->data())),
static_cast<uint32_t>(bloom_block->size()) * 8, num_blocks);
} else {
// Index in file but no bloom in file. Disable bloom filter in this case.
enable_bloom_ = false;
bloom_bits_per_key = 0;
}
PlainTableIndexBuilder index_builder(&arena_, ioptions_, prefix_extractor_,
index_sparseness, hash_table_ratio,
huge_page_tlb_size);
std::vector<uint32_t> prefix_hashes;
if (!index_in_file) {
s = PopulateIndexRecordList(&index_builder, &prefix_hashes);
if (!s.ok()) {
return s;
}
} else {
s = index_.InitFromRawData(*index_block);
if (!s.ok()) {
return s;
}
}
if (!index_in_file) {
// Calculated bloom filter size and allocate memory for
// bloom filter based on the number of prefixes, then fill it.
AllocateAndFillBloom(bloom_bits_per_key, index_.GetNumPrefixes(),
huge_page_tlb_size, &prefix_hashes);
}
// Fill two table properties.
if (!index_in_file) {
props->user_collected_properties["plain_table_hash_table_size"] =
ToString(index_.GetIndexSize() * PlainTableIndex::kOffsetLen);
props->user_collected_properties["plain_table_sub_index_size"] =
ToString(index_.GetSubIndexSize());
} else {
props->user_collected_properties["plain_table_hash_table_size"] =
ToString(0);
props->user_collected_properties["plain_table_sub_index_size"] =
ToString(0);
}
return Status::OK();
}
Status PlainTableReader::GetOffset(PlainTableKeyDecoder* decoder,
const Slice& target, const Slice& prefix,
uint32_t prefix_hash, bool& prefix_matched,
uint32_t* offset) const {
prefix_matched = false;
uint32_t prefix_index_offset;
auto res = index_.GetOffset(prefix_hash, &prefix_index_offset);
if (res == PlainTableIndex::kNoPrefixForBucket) {
*offset = file_info_.data_end_offset;
return Status::OK();
} else if (res == PlainTableIndex::kDirectToFile) {
*offset = prefix_index_offset;
return Status::OK();
}
// point to sub-index, need to do a binary search
uint32_t upper_bound;
const char* base_ptr =
index_.GetSubIndexBasePtrAndUpperBound(prefix_index_offset, &upper_bound);
uint32_t low = 0;
uint32_t high = upper_bound;
ParsedInternalKey mid_key;
ParsedInternalKey parsed_target;
if (!ParseInternalKey(target, &parsed_target)) {
return Status::Corruption(Slice());
}
// The key is between [low, high). Do a binary search between it.
while (high - low > 1) {
uint32_t mid = (high + low) / 2;
uint32_t file_offset = GetFixed32Element(base_ptr, mid);
uint32_t tmp;
Status s = decoder->NextKeyNoValue(file_offset, &mid_key, nullptr, &tmp);
if (!s.ok()) {
return s;
}
int cmp_result = internal_comparator_.Compare(mid_key, parsed_target);
if (cmp_result < 0) {
low = mid;
} else {
if (cmp_result == 0) {
// Happen to have found the exact key or target is smaller than the
// first key after base_offset.
prefix_matched = true;
*offset = file_offset;
return Status::OK();
} else {
high = mid;
}
}
}
// Both of the key at the position low or low+1 could share the same
// prefix as target. We need to rule out one of them to avoid to go
// to the wrong prefix.
ParsedInternalKey low_key;
uint32_t tmp;
uint32_t low_key_offset = GetFixed32Element(base_ptr, low);
Status s = decoder->NextKeyNoValue(low_key_offset, &low_key, nullptr, &tmp);
if (!s.ok()) {
return s;
}
if (GetPrefix(low_key) == prefix) {
prefix_matched = true;
*offset = low_key_offset;
} else if (low + 1 < upper_bound) {
// There is possible a next prefix, return it
prefix_matched = false;
*offset = GetFixed32Element(base_ptr, low + 1);
} else {
// target is larger than a key of the last prefix in this bucket
// but with a different prefix. Key does not exist.
*offset = file_info_.data_end_offset;
}
return Status::OK();
}
bool PlainTableReader::MatchBloom(uint32_t hash) const {
if (!enable_bloom_) {
return true;
}
if (bloom_.MayContainHash(hash)) {
PERF_COUNTER_ADD(bloom_sst_hit_count, 1);
return true;
} else {
PERF_COUNTER_ADD(bloom_sst_miss_count, 1);
return false;
}
}
Status PlainTableReader::Next(PlainTableKeyDecoder* decoder, uint32_t* offset,
ParsedInternalKey* parsed_key,
Slice* internal_key, Slice* value,
bool* seekable) const {
if (*offset == file_info_.data_end_offset) {
*offset = file_info_.data_end_offset;
return Status::OK();
}
if (*offset > file_info_.data_end_offset) {
return Status::Corruption("Offset is out of file size");
}
uint32_t bytes_read;
Status s = decoder->NextKey(*offset, parsed_key, internal_key, value,
&bytes_read, seekable);
if (!s.ok()) {
return s;
}
*offset = *offset + bytes_read;
return Status::OK();
}
void PlainTableReader::Prepare(const Slice& target) {
if (enable_bloom_) {
uint32_t prefix_hash = GetSliceHash(GetPrefix(target));
bloom_.Prefetch(prefix_hash);
}
}
Status PlainTableReader::Get(const ReadOptions& /*ro*/, const Slice& target,
GetContext* get_context,
const SliceTransform* /* prefix_extractor */,
bool /*skip_filters*/) {
// Check bloom filter first.
Slice prefix_slice;
uint32_t prefix_hash;
if (IsTotalOrderMode()) {
if (full_scan_mode_) {
status_ =
Status::InvalidArgument("Get() is not allowed in full scan mode.");
}
// Match whole user key for bloom filter check.
if (!MatchBloom(GetSliceHash(GetUserKey(target)))) {
return Status::OK();
}
// in total order mode, there is only one bucket 0, and we always use empty
// prefix.
prefix_slice = Slice();
prefix_hash = 0;
} else {
prefix_slice = GetPrefix(target);
prefix_hash = GetSliceHash(prefix_slice);
if (!MatchBloom(prefix_hash)) {
return Status::OK();
}
}
uint32_t offset;
bool prefix_match;
PlainTableKeyDecoder decoder(&file_info_, encoding_type_, user_key_len_,
prefix_extractor_);
Status s = GetOffset(&decoder, target, prefix_slice, prefix_hash,
prefix_match, &offset);
if (!s.ok()) {
return s;
}
ParsedInternalKey found_key;
ParsedInternalKey parsed_target;
if (!ParseInternalKey(target, &parsed_target)) {
return Status::Corruption(Slice());
}
Slice found_value;
while (offset < file_info_.data_end_offset) {
s = Next(&decoder, &offset, &found_key, nullptr, &found_value);
if (!s.ok()) {
return s;
}
if (!prefix_match) {
// Need to verify prefix for the first key found if it is not yet
// checked.
if (GetPrefix(found_key) != prefix_slice) {
return Status::OK();
}
prefix_match = true;
}
// TODO(ljin): since we know the key comparison result here,
// can we enable the fast path?
if (internal_comparator_.Compare(found_key, parsed_target) >= 0) {
bool dont_care __attribute__((__unused__));
if (!get_context->SaveValue(found_key, found_value, &dont_care,
dummy_cleanable_.get())) {
break;
}
}
}
return Status::OK();
}
uint64_t PlainTableReader::ApproximateOffsetOf(const Slice& /*key*/) {
return 0;
}
PlainTableIterator::PlainTableIterator(PlainTableReader* table,
bool use_prefix_seek)
: table_(table),
decoder_(&table_->file_info_, table_->encoding_type_,
table_->user_key_len_, table_->prefix_extractor_),
use_prefix_seek_(use_prefix_seek) {
next_offset_ = offset_ = table_->file_info_.data_end_offset;
}
PlainTableIterator::~PlainTableIterator() {
}
bool PlainTableIterator::Valid() const {
return offset_ < table_->file_info_.data_end_offset &&
offset_ >= table_->data_start_offset_;
}
void PlainTableIterator::SeekToFirst() {
status_ = Status::OK();
next_offset_ = table_->data_start_offset_;
if (next_offset_ >= table_->file_info_.data_end_offset) {
next_offset_ = offset_ = table_->file_info_.data_end_offset;
} else {
Next();
}
}
void PlainTableIterator::SeekToLast() {
assert(false);
status_ = Status::NotSupported("SeekToLast() is not supported in PlainTable");
next_offset_ = offset_ = table_->file_info_.data_end_offset;
}
void PlainTableIterator::Seek(const Slice& target) {
if (use_prefix_seek_ != !table_->IsTotalOrderMode()) {
// This check is done here instead of NewIterator() to permit creating an
// iterator with total_order_seek = true even if we won't be able to Seek()
// it. This is needed for compaction: it creates iterator with
// total_order_seek = true but usually never does Seek() on it,
// only SeekToFirst().
status_ =
Status::InvalidArgument(
"total_order_seek not implemented for PlainTable.");
offset_ = next_offset_ = table_->file_info_.data_end_offset;
return;
}
// If the user doesn't set prefix seek option and we are not able to do a
// total Seek(). assert failure.
if (table_->IsTotalOrderMode()) {
if (table_->full_scan_mode_) {
status_ =
Status::InvalidArgument("Seek() is not allowed in full scan mode.");
offset_ = next_offset_ = table_->file_info_.data_end_offset;
return;
} else if (table_->GetIndexSize() > 1) {
assert(false);
status_ = Status::NotSupported(
"PlainTable cannot issue non-prefix seek unless in total order "
"mode.");
offset_ = next_offset_ = table_->file_info_.data_end_offset;
return;
}
}
Slice prefix_slice = table_->GetPrefix(target);
uint32_t prefix_hash = 0;
// Bloom filter is ignored in total-order mode.
if (!table_->IsTotalOrderMode()) {
prefix_hash = GetSliceHash(prefix_slice);
if (!table_->MatchBloom(prefix_hash)) {
status_ = Status::OK();
offset_ = next_offset_ = table_->file_info_.data_end_offset;
return;
}
}
bool prefix_match;
status_ = table_->GetOffset(&decoder_, target, prefix_slice, prefix_hash,
prefix_match, &next_offset_);
if (!status_.ok()) {
offset_ = next_offset_ = table_->file_info_.data_end_offset;
return;
}
if (next_offset_ < table_->file_info_.data_end_offset) {
for (Next(); status_.ok() && Valid(); Next()) {
if (!prefix_match) {
// Need to verify the first key's prefix
if (table_->GetPrefix(key()) != prefix_slice) {
offset_ = next_offset_ = table_->file_info_.data_end_offset;
break;
}
prefix_match = true;
}
if (table_->internal_comparator_.Compare(key(), target) >= 0) {
break;
}
}
} else {
offset_ = table_->file_info_.data_end_offset;
}
}
void PlainTableIterator::SeekForPrev(const Slice& /*target*/) {
assert(false);
status_ =
Status::NotSupported("SeekForPrev() is not supported in PlainTable");
offset_ = next_offset_ = table_->file_info_.data_end_offset;
}
void PlainTableIterator::Next() {
offset_ = next_offset_;
if (offset_ < table_->file_info_.data_end_offset) {
Slice tmp_slice;
ParsedInternalKey parsed_key;
status_ =
table_->Next(&decoder_, &next_offset_, &parsed_key, &key_, &value_);
if (!status_.ok()) {
offset_ = next_offset_ = table_->file_info_.data_end_offset;
}
}
}
void PlainTableIterator::Prev() {
assert(false);
}
Slice PlainTableIterator::key() const {
assert(Valid());
return key_;
}
Slice PlainTableIterator::value() const {
assert(Valid());
return value_;
}
Status PlainTableIterator::status() const {
return status_;
}
} // namespace rocksdb
#endif // ROCKSDB_LITE
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