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rocksdb/util/options_helper.cc
Sameet Agarwal e7c434c364 Add columnfamily option optimize_filters_for_hits to optimize for key hits only 
Summary:
    Summary:
    Added a new option to ColumnFamllyOptions  - optimize_filters_for_hits. This option can be used in the case where most
    accesses to the store are key hits and we dont need to optimize performance for key misses.
    This is useful when you have a very large database and most of your lookups succeed.  The option allows the store to
     not store and use filters in the last level (the largest level which contains data). These filters can take a large amount of
     space for large databases (in memory and on-disk). For the last level, these filters are only useful for key misses and not
     for key hits. If we are not optimizing for key misses, we can choose to not store these filters for that level.

    This option is only provided for BlockBasedTable. We skip the filters when we are compacting

Test Plan:
1. Modified db_test toalso run tests with an additonal option (skip_filters_on_last_level)
 2. Added another unit test to db_test which specifically tests that filters are being skipped

Reviewers: rven, igor, sdong

Reviewed By: sdong

Subscribers: lgalanis, yoshinorim, MarkCallaghan, rven, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D33717
2015-02-26 16:25:56 -08:00

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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#include <cassert>
#include <cctype>
#include <unordered_set>
#include "rocksdb/cache.h"
#include "rocksdb/filter_policy.h"
#include "rocksdb/options.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/table.h"
#include "rocksdb/utilities/convenience.h"
#include "table/block_based_table_factory.h"
#include "util/options_helper.h"
namespace rocksdb {
#ifndef ROCKSDB_LITE
namespace {
CompressionType ParseCompressionType(const std::string& type) {
if (type == "kNoCompression") {
return kNoCompression;
} else if (type == "kSnappyCompression") {
return kSnappyCompression;
} else if (type == "kZlibCompression") {
return kZlibCompression;
} else if (type == "kBZip2Compression") {
return kBZip2Compression;
} else if (type == "kLZ4Compression") {
return kLZ4Compression;
} else if (type == "kLZ4HCCompression") {
return kLZ4HCCompression;
} else {
throw std::invalid_argument("Unknown compression type: " + type);
}
return kNoCompression;
}
BlockBasedTableOptions::IndexType ParseBlockBasedTableIndexType(
const std::string& type) {
if (type == "kBinarySearch") {
return BlockBasedTableOptions::kBinarySearch;
} else if (type == "kHashSearch") {
return BlockBasedTableOptions::kHashSearch;
}
throw std::invalid_argument("Unknown index type: " + type);
}
ChecksumType ParseBlockBasedTableChecksumType(
const std::string& type) {
if (type == "kNoChecksum") {
return kNoChecksum;
} else if (type == "kCRC32c") {
return kCRC32c;
} else if (type == "kxxHash") {
return kxxHash;
}
throw std::invalid_argument("Unknown checksum type: " + type);
}
bool ParseBoolean(const std::string& type, const std::string& value) {
if (value == "true" || value == "1") {
return true;
} else if (value == "false" || value == "0") {
return false;
}
throw std::invalid_argument(type);
}
uint64_t ParseUint64(const std::string& value) {
size_t endchar;
uint64_t num = std::stoull(value.c_str(), &endchar);
if (endchar < value.length()) {
char c = value[endchar];
if (c == 'k' || c == 'K')
num <<= 10LL;
else if (c == 'm' || c == 'M')
num <<= 20LL;
else if (c == 'g' || c == 'G')
num <<= 30LL;
else if (c == 't' || c == 'T')
num <<= 40LL;
}
return num;
}
size_t ParseSizeT(const std::string& value) {
return static_cast<size_t>(ParseUint64(value));
}
uint32_t ParseUint32(const std::string& value) {
uint64_t num = ParseUint64(value);
if ((num >> 32LL) == 0) {
return static_cast<uint32_t>(num);
} else {
throw std::out_of_range(value);
}
}
int ParseInt(const std::string& value) {
size_t endchar;
int num = std::stoi(value.c_str(), &endchar);
if (endchar < value.length()) {
char c = value[endchar];
if (c == 'k' || c == 'K')
num <<= 10;
else if (c == 'm' || c == 'M')
num <<= 20;
else if (c == 'g' || c == 'G')
num <<= 30;
}
return num;
}
double ParseDouble(const std::string& value) {
return std::stod(value);
}
CompactionStyle ParseCompactionStyle(const std::string& type) {
if (type == "kCompactionStyleLevel") {
return kCompactionStyleLevel;
} else if (type == "kCompactionStyleUniversal") {
return kCompactionStyleUniversal;
} else if (type == "kCompactionStyleFIFO") {
return kCompactionStyleFIFO;
} else {
throw std::invalid_argument("unknown compaction style: " + type);
}
return kCompactionStyleLevel;
}
} // anonymouse namespace
template<typename OptionsType>
bool ParseMemtableOptions(const std::string& name, const std::string& value,
OptionsType* new_options) {
if (name == "write_buffer_size") {
new_options->write_buffer_size = ParseSizeT(value);
} else if (name == "arena_block_size") {
new_options->arena_block_size = ParseSizeT(value);
} else if (name == "memtable_prefix_bloom_bits") {
new_options->memtable_prefix_bloom_bits = ParseUint32(value);
} else if (name == "memtable_prefix_bloom_probes") {
new_options->memtable_prefix_bloom_probes = ParseUint32(value);
} else if (name == "memtable_prefix_bloom_huge_page_tlb_size") {
new_options->memtable_prefix_bloom_huge_page_tlb_size =
ParseSizeT(value);
} else if (name == "max_successive_merges") {
new_options->max_successive_merges = ParseSizeT(value);
} else if (name == "filter_deletes") {
new_options->filter_deletes = ParseBoolean(name, value);
} else if (name == "max_write_buffer_number") {
new_options->max_write_buffer_number = ParseInt(value);
} else if (name == "inplace_update_num_locks") {
new_options->inplace_update_num_locks = ParseSizeT(value);
} else {
return false;
}
return true;
}
template<typename OptionsType>
bool ParseCompactionOptions(const std::string& name, const std::string& value,
OptionsType* new_options) {
if (name == "disable_auto_compactions") {
new_options->disable_auto_compactions = ParseBoolean(name, value);
} else if (name == "soft_rate_limit") {
new_options->soft_rate_limit = ParseDouble(value);
} else if (name == "hard_rate_limit") {
new_options->hard_rate_limit = ParseDouble(value);
} else if (name == "level0_file_num_compaction_trigger") {
new_options->level0_file_num_compaction_trigger = ParseInt(value);
} else if (name == "level0_slowdown_writes_trigger") {
new_options->level0_slowdown_writes_trigger = ParseInt(value);
} else if (name == "level0_stop_writes_trigger") {
new_options->level0_stop_writes_trigger = ParseInt(value);
} else if (name == "max_grandparent_overlap_factor") {
new_options->max_grandparent_overlap_factor = ParseInt(value);
} else if (name == "expanded_compaction_factor") {
new_options->expanded_compaction_factor = ParseInt(value);
} else if (name == "source_compaction_factor") {
new_options->source_compaction_factor = ParseInt(value);
} else if (name == "target_file_size_base") {
new_options->target_file_size_base = ParseInt(value);
} else if (name == "target_file_size_multiplier") {
new_options->target_file_size_multiplier = ParseInt(value);
} else if (name == "max_bytes_for_level_base") {
new_options->max_bytes_for_level_base = ParseUint64(value);
} else if (name == "max_bytes_for_level_multiplier") {
new_options->max_bytes_for_level_multiplier = ParseInt(value);
} else if (name == "max_bytes_for_level_multiplier_additional") {
new_options->max_bytes_for_level_multiplier_additional.clear();
size_t start = 0;
while (true) {
size_t end = value.find(':', start);
if (end == std::string::npos) {
new_options->max_bytes_for_level_multiplier_additional.push_back(
ParseInt(value.substr(start)));
break;
} else {
new_options->max_bytes_for_level_multiplier_additional.push_back(
ParseInt(value.substr(start, end - start)));
start = end + 1;
}
}
} else if (name == "max_mem_compaction_level") {
new_options->max_mem_compaction_level = ParseInt(value);
} else if (name == "verify_checksums_in_compaction") {
new_options->verify_checksums_in_compaction = ParseBoolean(name, value);
} else {
return false;
}
return true;
}
template<typename OptionsType>
bool ParseMiscOptions(const std::string& name, const std::string& value,
OptionsType* new_options) {
if (name == "max_sequential_skip_in_iterations") {
new_options->max_sequential_skip_in_iterations = ParseUint64(value);
} else {
return false;
}
return true;
}
Status GetMutableOptionsFromStrings(
const MutableCFOptions& base_options,
const std::unordered_map<std::string, std::string>& options_map,
MutableCFOptions* new_options) {
assert(new_options);
*new_options = base_options;
for (const auto& o : options_map) {
try {
if (ParseMemtableOptions(o.first, o.second, new_options)) {
} else if (ParseCompactionOptions(o.first, o.second, new_options)) {
} else if (ParseMiscOptions(o.first, o.second, new_options)) {
} else {
return Status::InvalidArgument(
"unsupported dynamic option: " + o.first);
}
} catch (std::exception& e) {
return Status::InvalidArgument("error parsing " + o.first + ":" +
std::string(e.what()));
}
}
return Status::OK();
}
namespace {
std::string trim(const std::string& str) {
size_t start = 0;
size_t end = str.size() - 1;
while (isspace(str[start]) != 0 && start <= end) {
++start;
}
while (isspace(str[end]) != 0 && start <= end) {
--end;
}
if (start <= end) {
return str.substr(start, end - start + 1);
}
return std::string();
}
} // anonymous namespace
Status StringToMap(const std::string& opts_str,
std::unordered_map<std::string, std::string>* opts_map) {
assert(opts_map);
// Example:
// opts_str = "write_buffer_size=1024;max_write_buffer_number=2;"
// "nested_opt={opt1=1;opt2=2};max_bytes_for_level_base=100"
size_t pos = 0;
std::string opts = trim(opts_str);
while (pos < opts.size()) {
size_t eq_pos = opts.find('=', pos);
if (eq_pos == std::string::npos) {
return Status::InvalidArgument("Mismatched key value pair, '=' expected");
}
std::string key = trim(opts.substr(pos, eq_pos - pos));
if (key.empty()) {
return Status::InvalidArgument("Empty key found");
}
// skip space after '=' and look for '{' for possible nested options
pos = eq_pos + 1;
while (pos < opts.size() && isspace(opts[pos])) {
++pos;
}
// Empty value at the end
if (pos >= opts.size()) {
(*opts_map)[key] = "";
break;
}
if (opts[pos] == '{') {
int count = 1;
size_t brace_pos = pos + 1;
while (brace_pos < opts.size()) {
if (opts[brace_pos] == '{') {
++count;
} else if (opts[brace_pos] == '}') {
--count;
if (count == 0) {
break;
}
}
++brace_pos;
}
// found the matching closing brace
if (count == 0) {
(*opts_map)[key] = trim(opts.substr(pos + 1, brace_pos - pos - 1));
// skip all whitespace and move to the next ';'
// brace_pos points to the next position after the matching '}'
pos = brace_pos + 1;
while (pos < opts.size() && isspace(opts[pos])) {
++pos;
}
if (pos < opts.size() && opts[pos] != ';') {
return Status::InvalidArgument(
"Unexpected chars after nested options");
}
++pos;
} else {
return Status::InvalidArgument(
"Mismatched curly braces for nested options");
}
} else {
size_t sc_pos = opts.find(';', pos);
if (sc_pos == std::string::npos) {
(*opts_map)[key] = trim(opts.substr(pos));
// It either ends with a trailing semi-colon or the last key-value pair
break;
} else {
(*opts_map)[key] = trim(opts.substr(pos, sc_pos - pos));
}
pos = sc_pos + 1;
}
}
return Status::OK();
}
bool ParseColumnFamilyOption(const std::string& name, const std::string& value,
ColumnFamilyOptions* new_options) {
try {
if (ParseMemtableOptions(name, value, new_options)) {
} else if (ParseCompactionOptions(name, value, new_options)) {
} else if (ParseMiscOptions(name, value, new_options)) {
} else if (name == "block_based_table_factory") {
// Nested options
BlockBasedTableOptions table_opt, base_table_options;
auto block_based_table_factory = dynamic_cast<BlockBasedTableFactory*>(
new_options->table_factory.get());
if (block_based_table_factory != nullptr) {
base_table_options = block_based_table_factory->GetTableOptions();
}
Status table_opt_s = GetBlockBasedTableOptionsFromString(
base_table_options, value, &table_opt);
if (!table_opt_s.ok()) {
return false;
}
new_options->table_factory.reset(NewBlockBasedTableFactory(table_opt));
} else if (name == "min_write_buffer_number_to_merge") {
new_options->min_write_buffer_number_to_merge = ParseInt(value);
} else if (name == "compression") {
new_options->compression = ParseCompressionType(value);
} else if (name == "compression_per_level") {
new_options->compression_per_level.clear();
size_t start = 0;
while (true) {
size_t end = value.find(':', start);
if (end == std::string::npos) {
new_options->compression_per_level.push_back(
ParseCompressionType(value.substr(start)));
break;
} else {
new_options->compression_per_level.push_back(
ParseCompressionType(value.substr(start, end - start)));
start = end + 1;
}
}
} else if (name == "compression_opts") {
size_t start = 0;
size_t end = value.find(':');
if (end == std::string::npos) {
return false;
}
new_options->compression_opts.window_bits =
ParseInt(value.substr(start, end - start));
start = end + 1;
end = value.find(':', start);
if (end == std::string::npos) {
return false;
}
new_options->compression_opts.level =
ParseInt(value.substr(start, end - start));
start = end + 1;
if (start >= value.size()) {
return false;
}
new_options->compression_opts.strategy =
ParseInt(value.substr(start, value.size() - start));
} else if (name == "num_levels") {
new_options->num_levels = ParseInt(value);
} else if (name == "purge_redundant_kvs_while_flush") {
new_options->purge_redundant_kvs_while_flush =
ParseBoolean(name, value);
} else if (name == "compaction_style") {
new_options->compaction_style = ParseCompactionStyle(value);
} else if (name == "compaction_options_universal") {
// TODO(ljin): add support
return false;
} else if (name == "compaction_options_fifo") {
new_options->compaction_options_fifo.max_table_files_size =
ParseUint64(value);
} else if (name == "bloom_locality") {
new_options->bloom_locality = ParseUint32(value);
} else if (name == "min_partial_merge_operands") {
new_options->min_partial_merge_operands = ParseUint32(value);
} else if (name == "inplace_update_support") {
new_options->inplace_update_support = ParseBoolean(name, value);
} else if (name == "prefix_extractor") {
const std::string kFixedPrefixName = "fixed:";
const std::string kCappedPrefixName = "capped:";
auto& pe_value = value;
if (pe_value.size() > kFixedPrefixName.size() &&
pe_value.compare(0, kFixedPrefixName.size(), kFixedPrefixName) == 0) {
int prefix_length =
ParseInt(trim(value.substr(kFixedPrefixName.size())));
new_options->prefix_extractor.reset(
NewFixedPrefixTransform(prefix_length));
} else if (pe_value.size() > kCappedPrefixName.size() &&
pe_value.compare(0, kCappedPrefixName.size(),
kCappedPrefixName) == 0) {
int prefix_length =
ParseInt(trim(pe_value.substr(kCappedPrefixName.size())));
new_options->prefix_extractor.reset(
NewCappedPrefixTransform(prefix_length));
} else {
return false;
}
} else if (name == "optimize_filters_for_hits") {
new_options->optimize_filters_for_hits = ParseBoolean(name, value);
} else {
return false;
}
}
catch (std::exception& e) {
return false;
}
return true;
}
bool ParseDBOption(const std::string& name, const std::string& value,
DBOptions* new_options) {
try {
if (name == "create_if_missing") {
new_options->create_if_missing = ParseBoolean(name, value);
} else if (name == "create_missing_column_families") {
new_options->create_missing_column_families =
ParseBoolean(name, value);
} else if (name == "error_if_exists") {
new_options->error_if_exists = ParseBoolean(name, value);
} else if (name == "paranoid_checks") {
new_options->paranoid_checks = ParseBoolean(name, value);
} else if (name == "max_open_files") {
new_options->max_open_files = ParseInt(value);
} else if (name == "max_total_wal_size") {
new_options->max_total_wal_size = ParseUint64(value);
} else if (name == "disable_data_sync") {
new_options->disableDataSync = ParseBoolean(name, value);
} else if (name == "use_fsync") {
new_options->use_fsync = ParseBoolean(name, value);
} else if (name == "db_paths") {
// TODO(ljin): add support
return false;
} else if (name == "db_log_dir") {
new_options->db_log_dir = value;
} else if (name == "wal_dir") {
new_options->wal_dir = value;
} else if (name == "delete_obsolete_files_period_micros") {
new_options->delete_obsolete_files_period_micros = ParseUint64(value);
} else if (name == "max_background_compactions") {
new_options->max_background_compactions = ParseInt(value);
} else if (name == "max_background_flushes") {
new_options->max_background_flushes = ParseInt(value);
} else if (name == "max_log_file_size") {
new_options->max_log_file_size = ParseSizeT(value);
} else if (name == "log_file_time_to_roll") {
new_options->log_file_time_to_roll = ParseSizeT(value);
} else if (name == "keep_log_file_num") {
new_options->keep_log_file_num = ParseSizeT(value);
} else if (name == "max_manifest_file_size") {
new_options->max_manifest_file_size = ParseUint64(value);
} else if (name == "table_cache_numshardbits") {
new_options->table_cache_numshardbits = ParseInt(value);
} else if (name == "table_cache_remove_scan_count_limit") {
new_options->table_cache_remove_scan_count_limit = ParseInt(value);
} else if (name == "WAL_ttl_seconds") {
new_options->WAL_ttl_seconds = ParseUint64(value);
} else if (name == "WAL_size_limit_MB") {
new_options->WAL_size_limit_MB = ParseUint64(value);
} else if (name == "manifest_preallocation_size") {
new_options->manifest_preallocation_size = ParseSizeT(value);
} else if (name == "allow_os_buffer") {
new_options->allow_os_buffer = ParseBoolean(name, value);
} else if (name == "allow_mmap_reads") {
new_options->allow_mmap_reads = ParseBoolean(name, value);
} else if (name == "allow_mmap_writes") {
new_options->allow_mmap_writes = ParseBoolean(name, value);
} else if (name == "is_fd_close_on_exec") {
new_options->is_fd_close_on_exec = ParseBoolean(name, value);
} else if (name == "skip_log_error_on_recovery") {
new_options->skip_log_error_on_recovery = ParseBoolean(name, value);
} else if (name == "stats_dump_period_sec") {
new_options->stats_dump_period_sec = ParseUint32(value);
} else if (name == "advise_random_on_open") {
new_options->advise_random_on_open = ParseBoolean(name, value);
} else if (name == "db_write_buffer_size") {
new_options->db_write_buffer_size = ParseUint64(value);
} else if (name == "use_adaptive_mutex") {
new_options->use_adaptive_mutex = ParseBoolean(name, value);
} else if (name == "bytes_per_sync") {
new_options->bytes_per_sync = ParseUint64(value);
} else {
return false;
}
}
catch (std::exception& e) {
return false;
}
return true;
}
Status GetBlockBasedTableOptionsFromMap(
const BlockBasedTableOptions& table_options,
const std::unordered_map<std::string, std::string>& opts_map,
BlockBasedTableOptions* new_table_options) {
assert(new_table_options);
*new_table_options = table_options;
for (const auto& o : opts_map) {
try {
if (o.first == "cache_index_and_filter_blocks") {
new_table_options->cache_index_and_filter_blocks =
ParseBoolean(o.first, o.second);
} else if (o.first == "index_type") {
new_table_options->index_type = ParseBlockBasedTableIndexType(o.second);
} else if (o.first == "hash_index_allow_collision") {
new_table_options->hash_index_allow_collision =
ParseBoolean(o.first, o.second);
} else if (o.first == "checksum") {
new_table_options->checksum =
ParseBlockBasedTableChecksumType(o.second);
} else if (o.first == "no_block_cache") {
new_table_options->no_block_cache = ParseBoolean(o.first, o.second);
} else if (o.first == "block_cache") {
new_table_options->block_cache = NewLRUCache(ParseSizeT(o.second));
} else if (o.first == "block_cache_compressed") {
new_table_options->block_cache_compressed =
NewLRUCache(ParseSizeT(o.second));
} else if (o.first == "block_size") {
new_table_options->block_size = ParseSizeT(o.second);
} else if (o.first == "block_size_deviation") {
new_table_options->block_size_deviation = ParseInt(o.second);
} else if (o.first == "block_restart_interval") {
new_table_options->block_restart_interval = ParseInt(o.second);
} else if (o.first == "filter_policy") {
// Expect the following format
// bloomfilter:int:bool
const std::string kName = "bloomfilter:";
if (o.second.compare(0, kName.size(), kName) != 0) {
return Status::InvalidArgument("Invalid filter policy name");
}
size_t pos = o.second.find(':', kName.size());
if (pos == std::string::npos) {
return Status::InvalidArgument("Invalid filter policy config, "
"missing bits_per_key");
}
int bits_per_key = ParseInt(
trim(o.second.substr(kName.size(), pos - kName.size())));
bool use_block_based_builder =
ParseBoolean("use_block_based_builder",
trim(o.second.substr(pos + 1)));
new_table_options->filter_policy.reset(
NewBloomFilterPolicy(bits_per_key, use_block_based_builder));
} else if (o.first == "whole_key_filtering") {
new_table_options->whole_key_filtering =
ParseBoolean(o.first, o.second);
} else {
return Status::InvalidArgument("Unrecognized option: " + o.first);
}
} catch (std::exception& e) {
return Status::InvalidArgument("error parsing " + o.first + ":" +
std::string(e.what()));
}
}
return Status::OK();
}
Status GetBlockBasedTableOptionsFromString(
const BlockBasedTableOptions& table_options,
const std::string& opts_str,
BlockBasedTableOptions* new_table_options) {
std::unordered_map<std::string, std::string> opts_map;
Status s = StringToMap(opts_str, &opts_map);
if (!s.ok()) {
return s;
}
return GetBlockBasedTableOptionsFromMap(table_options, opts_map,
new_table_options);
}
Status GetColumnFamilyOptionsFromMap(
const ColumnFamilyOptions& base_options,
const std::unordered_map<std::string, std::string>& opts_map,
ColumnFamilyOptions* new_options) {
assert(new_options);
*new_options = base_options;
for (const auto& o : opts_map) {
if (!ParseColumnFamilyOption(o.first, o.second, new_options)) {
return Status::InvalidArgument("Can't parse option " + o.first);
}
}
return Status::OK();
}
Status GetColumnFamilyOptionsFromString(
const ColumnFamilyOptions& base_options,
const std::string& opts_str,
ColumnFamilyOptions* new_options) {
std::unordered_map<std::string, std::string> opts_map;
Status s = StringToMap(opts_str, &opts_map);
if (!s.ok()) {
return s;
}
return GetColumnFamilyOptionsFromMap(base_options, opts_map, new_options);
}
Status GetDBOptionsFromMap(
const DBOptions& base_options,
const std::unordered_map<std::string, std::string>& opts_map,
DBOptions* new_options) {
assert(new_options);
*new_options = base_options;
for (const auto& o : opts_map) {
if (!ParseDBOption(o.first, o.second, new_options)) {
return Status::InvalidArgument("Can't parse option " + o.first);
}
}
return Status::OK();
}
Status GetDBOptionsFromString(
const DBOptions& base_options,
const std::string& opts_str,
DBOptions* new_options) {
std::unordered_map<std::string, std::string> opts_map;
Status s = StringToMap(opts_str, &opts_map);
if (!s.ok()) {
return s;
}
return GetDBOptionsFromMap(base_options, opts_map, new_options);
}
Status GetOptionsFromString(const Options& base_options,
const std::string& opts_str, Options* new_options) {
std::unordered_map<std::string, std::string> opts_map;
Status s = StringToMap(opts_str, &opts_map);
if (!s.ok()) {
return s;
}
DBOptions new_db_options(base_options);
ColumnFamilyOptions new_cf_options(base_options);
for (const auto& o : opts_map) {
if (ParseDBOption(o.first, o.second, &new_db_options)) {
} else if (ParseColumnFamilyOption(o.first, o.second, &new_cf_options)) {
} else {
return Status::InvalidArgument("Can't parse option " + o.first);
}
}
*new_options = Options(new_db_options, new_cf_options);
return Status::OK();
}
#endif // ROCKSDB_LITE
} // namespace rocksdb
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