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rocksdb/db/internal_stats.h

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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.
//
#pragma once
#include <map>
#include <string>
#include <vector>
#include "db/version_set.h"
class ColumnFamilyData;
namespace rocksdb {
class DBImpl;
class MemTableList;
// Config for retrieving a property's value.
struct DBPropertyInfo {
bool need_out_of_mutex;
// gcc had an internal error for initializing union of pointer-to-member-
// functions. Workaround is to populate exactly one of the following function
// pointers with a non-nullptr value.
// @param value Value-result argument for storing the property's string value
// @param suffix Argument portion of the property. For example, suffix would
// be "5" for the property "rocksdb.num-files-at-level5". So far, only
// certain string properties take an argument.
bool (InternalStats::*handle_string)(std::string* value, Slice suffix);
// @param value Value-result argument for storing the property's uint64 value
// @param db Many of the int properties rely on DBImpl methods.
// @param version Version is needed in case the property is retrieved without
// holding db mutex, which is only supported for int properties.
bool (InternalStats::*handle_int)(uint64_t* value, DBImpl* db,
Version* version);
// @param props Map of general properties to populate
bool (InternalStats::*handle_map)(std::map<std::string, std::string>* props);
// handle the string type properties rely on DBImpl methods
// @param value Value-result argument for storing the property's string value
bool (DBImpl::*handle_string_dbimpl)(std::string* value);
};
extern const DBPropertyInfo* GetPropertyInfo(const Slice& property);
#ifndef ROCKSDB_LITE
#undef SCORE
enum class LevelStatType {
INVALID = 0,
NUM_FILES,
COMPACTED_FILES,
SIZE_BYTES,
SCORE,
READ_GB,
RN_GB,
RNP1_GB,
WRITE_GB,
W_NEW_GB,
MOVED_GB,
WRITE_AMP,
READ_MBPS,
WRITE_MBPS,
COMP_SEC,
COMP_CPU_SEC,
COMP_COUNT,
AVG_SEC,
KEY_IN,
KEY_DROP,
TOTAL // total number of types
};
struct LevelStat {
// This what will be L?.property_name in the flat map returned to the user
std::string property_name;
// This will be what we will print in the header in the cli
std::string header_name;
};
class InternalStats {
public:
static const std::map<LevelStatType, LevelStat> compaction_level_stats;
enum InternalCFStatsType {
L0_FILE_COUNT_LIMIT_SLOWDOWNS,
LOCKED_L0_FILE_COUNT_LIMIT_SLOWDOWNS,
MEMTABLE_LIMIT_STOPS,
MEMTABLE_LIMIT_SLOWDOWNS,
L0_FILE_COUNT_LIMIT_STOPS,
LOCKED_L0_FILE_COUNT_LIMIT_STOPS,
PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS,
PENDING_COMPACTION_BYTES_LIMIT_STOPS,
WRITE_STALLS_ENUM_MAX,
BYTES_FLUSHED,
BYTES_INGESTED_ADD_FILE,
INGESTED_NUM_FILES_TOTAL,
INGESTED_LEVEL0_NUM_FILES_TOTAL,
INGESTED_NUM_KEYS_TOTAL,
INTERNAL_CF_STATS_ENUM_MAX,
};
enum InternalDBStatsType {
kIntStatsWalFileBytes,
kIntStatsWalFileSynced,
kIntStatsBytesWritten,
kIntStatsNumKeysWritten,
kIntStatsWriteDoneByOther,
kIntStatsWriteDoneBySelf,
kIntStatsWriteWithWal,
kIntStatsWriteStallMicros,
kIntStatsNumMax,
};
InternalStats(int num_levels, Env* env, ColumnFamilyData* cfd)
: db_stats_{},
cf_stats_value_{},
cf_stats_count_{},
comp_stats_(num_levels),
comp_stats_by_pri_(Env::Priority::TOTAL),
file_read_latency_(num_levels),
bg_error_count_(0),
number_levels_(num_levels),
env_(env),
cfd_(cfd),
started_at_(env->NowMicros()) {}
// Per level compaction stats. comp_stats_[level] stores the stats for
// compactions that produced data for the specified "level".
struct CompactionStats {
uint64_t micros;
uint64_t cpu_micros;
// The number of bytes read from all non-output levels
uint64_t bytes_read_non_output_levels;
// The number of bytes read from the compaction output level.
uint64_t bytes_read_output_level;
// Total number of bytes written during compaction
uint64_t bytes_written;
// Total number of bytes moved to the output level
uint64_t bytes_moved;
// The number of compaction input files in all non-output levels.
int num_input_files_in_non_output_levels;
// The number of compaction input files in the output level.
int num_input_files_in_output_level;
// The number of compaction output files.
int num_output_files;
// Total incoming entries during compaction between levels N and N+1
uint64_t num_input_records;
// Accumulated diff number of entries
// (num input entries - num output entires) for compaction levels N and N+1
uint64_t num_dropped_records;
// Number of compactions done
int count;
// Number of compactions done per CompactionReason
int counts[static_cast<int>(CompactionReason::kNumOfReasons)];
explicit CompactionStats()
: micros(0),
cpu_micros(0),
bytes_read_non_output_levels(0),
bytes_read_output_level(0),
bytes_written(0),
bytes_moved(0),
num_input_files_in_non_output_levels(0),
num_input_files_in_output_level(0),
num_output_files(0),
num_input_records(0),
num_dropped_records(0),
count(0) {
int num_of_reasons = static_cast<int>(CompactionReason::kNumOfReasons);
for (int i = 0; i < num_of_reasons; i++) {
counts[i] = 0;
}
}
explicit CompactionStats(CompactionReason reason, int c)
: micros(0),
cpu_micros(0),
bytes_read_non_output_levels(0),
bytes_read_output_level(0),
bytes_written(0),
bytes_moved(0),
num_input_files_in_non_output_levels(0),
num_input_files_in_output_level(0),
num_output_files(0),
num_input_records(0),
num_dropped_records(0),
count(c) {
int num_of_reasons = static_cast<int>(CompactionReason::kNumOfReasons);
for (int i = 0; i < num_of_reasons; i++) {
counts[i] = 0;
}
int r = static_cast<int>(reason);
if (r >= 0 && r < num_of_reasons) {
counts[r] = c;
} else {
count = 0;
}
}
explicit CompactionStats(const CompactionStats& c)
: micros(c.micros),
cpu_micros(c.cpu_micros),
bytes_read_non_output_levels(c.bytes_read_non_output_levels),
bytes_read_output_level(c.bytes_read_output_level),
bytes_written(c.bytes_written),
bytes_moved(c.bytes_moved),
num_input_files_in_non_output_levels(
c.num_input_files_in_non_output_levels),
num_input_files_in_output_level(c.num_input_files_in_output_level),
num_output_files(c.num_output_files),
num_input_records(c.num_input_records),
num_dropped_records(c.num_dropped_records),
count(c.count) {
int num_of_reasons = static_cast<int>(CompactionReason::kNumOfReasons);
for (int i = 0; i < num_of_reasons; i++) {
counts[i] = c.counts[i];
}
}
CompactionStats& operator=(const CompactionStats& c) {
micros = c.micros;
cpu_micros = c.cpu_micros;
bytes_read_non_output_levels = c.bytes_read_non_output_levels;
bytes_read_output_level = c.bytes_read_output_level;
bytes_written = c.bytes_written;
bytes_moved = c.bytes_moved;
num_input_files_in_non_output_levels =
c.num_input_files_in_non_output_levels;
num_input_files_in_output_level = c.num_input_files_in_output_level;
num_output_files = c.num_output_files;
num_input_records = c.num_input_records;
num_dropped_records = c.num_dropped_records;
count = c.count;
int num_of_reasons = static_cast<int>(CompactionReason::kNumOfReasons);
for (int i = 0; i < num_of_reasons; i++) {
counts[i] = c.counts[i];
}
return *this;
}
void Clear() {
this->micros = 0;
this->cpu_micros = 0;
this->bytes_read_non_output_levels = 0;
this->bytes_read_output_level = 0;
this->bytes_written = 0;
this->bytes_moved = 0;
this->num_input_files_in_non_output_levels = 0;
this->num_input_files_in_output_level = 0;
this->num_output_files = 0;
this->num_input_records = 0;
this->num_dropped_records = 0;
this->count = 0;
int num_of_reasons = static_cast<int>(CompactionReason::kNumOfReasons);
for (int i = 0; i < num_of_reasons; i++) {
counts[i] = 0;
}
}
void Add(const CompactionStats& c) {
this->micros += c.micros;
this->cpu_micros += c.cpu_micros;
this->bytes_read_non_output_levels += c.bytes_read_non_output_levels;
this->bytes_read_output_level += c.bytes_read_output_level;
this->bytes_written += c.bytes_written;
this->bytes_moved += c.bytes_moved;
this->num_input_files_in_non_output_levels +=
c.num_input_files_in_non_output_levels;
this->num_input_files_in_output_level +=
c.num_input_files_in_output_level;
this->num_output_files += c.num_output_files;
this->num_input_records += c.num_input_records;
this->num_dropped_records += c.num_dropped_records;
this->count += c.count;
int num_of_reasons = static_cast<int>(CompactionReason::kNumOfReasons);
for (int i = 0; i< num_of_reasons; i++) {
counts[i] += c.counts[i];
}
}
void Subtract(const CompactionStats& c) {
this->micros -= c.micros;
this->cpu_micros -= c.cpu_micros;
this->bytes_read_non_output_levels -= c.bytes_read_non_output_levels;
this->bytes_read_output_level -= c.bytes_read_output_level;
this->bytes_written -= c.bytes_written;
this->bytes_moved -= c.bytes_moved;
this->num_input_files_in_non_output_levels -=
c.num_input_files_in_non_output_levels;
this->num_input_files_in_output_level -=
c.num_input_files_in_output_level;
this->num_output_files -= c.num_output_files;
this->num_input_records -= c.num_input_records;
this->num_dropped_records -= c.num_dropped_records;
this->count -= c.count;
int num_of_reasons = static_cast<int>(CompactionReason::kNumOfReasons);
for (int i = 0; i < num_of_reasons; i++) {
counts[i] -= c.counts[i];
}
}
};
void Clear() {
for (int i = 0; i < kIntStatsNumMax; i++) {
db_stats_[i].store(0);
}
for (int i = 0; i < INTERNAL_CF_STATS_ENUM_MAX; i++) {
cf_stats_count_[i] = 0;
cf_stats_value_[i] = 0;
}
for (auto& comp_stat : comp_stats_) {
comp_stat.Clear();
}
for (auto& h : file_read_latency_) {
h.Clear();
}
cf_stats_snapshot_.Clear();
db_stats_snapshot_.Clear();
bg_error_count_ = 0;
started_at_ = env_->NowMicros();
}
void AddCompactionStats(int level, Env::Priority thread_pri,
const CompactionStats& stats) {
comp_stats_[level].Add(stats);
comp_stats_by_pri_[thread_pri].Add(stats);
}
void IncBytesMoved(int level, uint64_t amount) {
comp_stats_[level].bytes_moved += amount;
}
void AddCFStats(InternalCFStatsType type, uint64_t value) {
cf_stats_value_[type] += value;
++cf_stats_count_[type];
}
void AddDBStats(InternalDBStatsType type, uint64_t value,
bool concurrent = false) {
auto& v = db_stats_[type];
if (concurrent) {
v.fetch_add(value, std::memory_order_relaxed);
} else {
v.store(v.load(std::memory_order_relaxed) + value,
std::memory_order_relaxed);
}
}
uint64_t GetDBStats(InternalDBStatsType type) {
return db_stats_[type].load(std::memory_order_relaxed);
}
HistogramImpl* GetFileReadHist(int level) {
return &file_read_latency_[level];
}
uint64_t GetBackgroundErrorCount() const { return bg_error_count_; }
uint64_t BumpAndGetBackgroundErrorCount() { return ++bg_error_count_; }
bool GetStringProperty(const DBPropertyInfo& property_info,
const Slice& property, std::string* value);
bool GetMapProperty(const DBPropertyInfo& property_info,
const Slice& property,
std::map<std::string, std::string>* value);
bool GetIntProperty(const DBPropertyInfo& property_info, uint64_t* value,
DBImpl* db);
bool GetIntPropertyOutOfMutex(const DBPropertyInfo& property_info,
Version* version, uint64_t* value);
const std::vector<CompactionStats>& TEST_GetCompactionStats() const {
return comp_stats_;
}
// Store a mapping from the user-facing DB::Properties string to our
// DBPropertyInfo struct used internally for retrieving properties.
static const std::unordered_map<std::string, DBPropertyInfo> ppt_name_to_info;
private:
void DumpDBStats(std::string* value);
void DumpCFMapStats(std::map<std::string, std::string>* cf_stats);
void DumpCFMapStats(
std::map<int, std::map<LevelStatType, double>>* level_stats,
CompactionStats* compaction_stats_sum);
void DumpCFMapStatsByPriority(
std::map<int, std::map<LevelStatType, double>>* priorities_stats);
void DumpCFMapStatsIOStalls(std::map<std::string, std::string>* cf_stats);
void DumpCFStats(std::string* value);
void DumpCFStatsNoFileHistogram(std::string* value);
void DumpCFFileHistogram(std::string* value);
bool HandleBlockCacheStat(Cache** block_cache);
// Per-DB stats
std::atomic<uint64_t> db_stats_[kIntStatsNumMax];
// Per-ColumnFamily stats
uint64_t cf_stats_value_[INTERNAL_CF_STATS_ENUM_MAX];
uint64_t cf_stats_count_[INTERNAL_CF_STATS_ENUM_MAX];
// Per-ColumnFamily/level compaction stats
std::vector<CompactionStats> comp_stats_;
std::vector<CompactionStats> comp_stats_by_pri_;
std::vector<HistogramImpl> file_read_latency_;
// Used to compute per-interval statistics
struct CFStatsSnapshot {
// ColumnFamily-level stats
CompactionStats comp_stats;
uint64_t ingest_bytes_flush; // Bytes written to L0 (Flush)
uint64_t stall_count; // Stall count
// Stats from compaction jobs - bytes written, bytes read, duration.
uint64_t compact_bytes_write;
uint64_t compact_bytes_read;
uint64_t compact_micros;
double seconds_up;
// AddFile specific stats
uint64_t ingest_bytes_addfile; // Total Bytes ingested
uint64_t ingest_files_addfile; // Total number of files ingested
uint64_t ingest_l0_files_addfile; // Total number of files ingested to L0
uint64_t ingest_keys_addfile; // Total number of keys ingested
CFStatsSnapshot()
: ingest_bytes_flush(0),
stall_count(0),
compact_bytes_write(0),
compact_bytes_read(0),
compact_micros(0),
seconds_up(0),
ingest_bytes_addfile(0),
ingest_files_addfile(0),
ingest_l0_files_addfile(0),
ingest_keys_addfile(0) {}
void Clear() {
comp_stats.Clear();
ingest_bytes_flush = 0;
stall_count = 0;
compact_bytes_write = 0;
compact_bytes_read = 0;
compact_micros = 0;
seconds_up = 0;
ingest_bytes_addfile = 0;
ingest_files_addfile = 0;
ingest_l0_files_addfile = 0;
ingest_keys_addfile = 0;
}
} cf_stats_snapshot_;
struct DBStatsSnapshot {
// DB-level stats
uint64_t ingest_bytes; // Bytes written by user
uint64_t wal_bytes; // Bytes written to WAL
uint64_t wal_synced; // Number of times WAL is synced
uint64_t write_with_wal; // Number of writes that request WAL
// These count the number of writes processed by the calling thread or
// another thread.
uint64_t write_other;
uint64_t write_self;
// Total number of keys written. write_self and write_other measure number
// of write requests written, Each of the write request can contain updates
// to multiple keys. num_keys_written is total number of keys updated by all
// those writes.
uint64_t num_keys_written;
// Total time writes delayed by stalls.
uint64_t write_stall_micros;
double seconds_up;
DBStatsSnapshot()
: ingest_bytes(0),
wal_bytes(0),
wal_synced(0),
write_with_wal(0),
write_other(0),
write_self(0),
num_keys_written(0),
write_stall_micros(0),
seconds_up(0) {}
void Clear() {
ingest_bytes = 0;
wal_bytes = 0;
wal_synced = 0;
write_with_wal = 0;
write_other = 0;
write_self = 0;
num_keys_written = 0;
write_stall_micros = 0;
seconds_up = 0;
}
} db_stats_snapshot_;
// Handler functions for getting property values. They use "value" as a value-
// result argument, and return true upon successfully setting "value".
bool HandleNumFilesAtLevel(std::string* value, Slice suffix);
bool HandleCompressionRatioAtLevelPrefix(std::string* value, Slice suffix);
bool HandleLevelStats(std::string* value, Slice suffix);
bool HandleStats(std::string* value, Slice suffix);
bool HandleCFMapStats(std::map<std::string, std::string>* compaction_stats);
bool HandleCFStats(std::string* value, Slice suffix);
bool HandleCFStatsNoFileHistogram(std::string* value, Slice suffix);
bool HandleCFFileHistogram(std::string* value, Slice suffix);
bool HandleDBStats(std::string* value, Slice suffix);
bool HandleSsTables(std::string* value, Slice suffix);
bool HandleAggregatedTableProperties(std::string* value, Slice suffix);
bool HandleAggregatedTablePropertiesAtLevel(std::string* value, Slice suffix);
bool HandleNumImmutableMemTable(uint64_t* value, DBImpl* db,
Version* version);
bool HandleNumImmutableMemTableFlushed(uint64_t* value, DBImpl* db,
Version* version);
bool HandleMemTableFlushPending(uint64_t* value, DBImpl* db,
Version* version);
bool HandleNumRunningFlushes(uint64_t* value, DBImpl* db, Version* version);
bool HandleCompactionPending(uint64_t* value, DBImpl* db, Version* version);
bool HandleNumRunningCompactions(uint64_t* value, DBImpl* db,
Version* version);
bool HandleBackgroundErrors(uint64_t* value, DBImpl* db, Version* version);
bool HandleCurSizeActiveMemTable(uint64_t* value, DBImpl* db,
Version* version);
bool HandleCurSizeAllMemTables(uint64_t* value, DBImpl* db, Version* version);
bool HandleSizeAllMemTables(uint64_t* value, DBImpl* db, Version* version);
bool HandleNumEntriesActiveMemTable(uint64_t* value, DBImpl* db,
Version* version);
bool HandleNumEntriesImmMemTables(uint64_t* value, DBImpl* db,
Version* version);
bool HandleNumDeletesActiveMemTable(uint64_t* value, DBImpl* db,
Version* version);
bool HandleNumDeletesImmMemTables(uint64_t* value, DBImpl* db,
Version* version);
bool HandleEstimateNumKeys(uint64_t* value, DBImpl* db, Version* version);
bool HandleNumSnapshots(uint64_t* value, DBImpl* db, Version* version);
bool HandleOldestSnapshotTime(uint64_t* value, DBImpl* db, Version* version);
bool HandleOldestSnapshotSequence(uint64_t* value, DBImpl* db,
Version* version);
bool HandleNumLiveVersions(uint64_t* value, DBImpl* db, Version* version);
bool HandleCurrentSuperVersionNumber(uint64_t* value, DBImpl* db,
Version* version);
bool HandleIsFileDeletionsEnabled(uint64_t* value, DBImpl* db,
Version* version);
bool HandleBaseLevel(uint64_t* value, DBImpl* db, Version* version);
bool HandleTotalSstFilesSize(uint64_t* value, DBImpl* db, Version* version);
bool HandleLiveSstFilesSize(uint64_t* value, DBImpl* db, Version* version);
bool HandleEstimatePendingCompactionBytes(uint64_t* value, DBImpl* db,
Version* version);
bool HandleEstimateTableReadersMem(uint64_t* value, DBImpl* db,
Version* version);
bool HandleEstimateLiveDataSize(uint64_t* value, DBImpl* db,
Version* version);
bool HandleMinLogNumberToKeep(uint64_t* value, DBImpl* db, Version* version);
bool HandleMinObsoleteSstNumberToKeep(uint64_t* value, DBImpl* db,
Version* version);
bool HandleActualDelayedWriteRate(uint64_t* value, DBImpl* db,
Version* version);
bool HandleIsWriteStopped(uint64_t* value, DBImpl* db, Version* version);
bool HandleEstimateOldestKeyTime(uint64_t* value, DBImpl* db,
Version* version);
bool HandleBlockCacheCapacity(uint64_t* value, DBImpl* db, Version* version);
bool HandleBlockCacheUsage(uint64_t* value, DBImpl* db, Version* version);
bool HandleBlockCachePinnedUsage(uint64_t* value, DBImpl* db,
Version* version);
// Total number of background errors encountered. Every time a flush task
// or compaction task fails, this counter is incremented. The failure can
// be caused by any possible reason, including file system errors, out of
// resources, or input file corruption. Failing when retrying the same flush
// or compaction will cause the counter to increase too.
uint64_t bg_error_count_;
const int number_levels_;
Env* env_;
ColumnFamilyData* cfd_;
uint64_t started_at_;
};
#else
class InternalStats {
public:
enum InternalCFStatsType {
L0_FILE_COUNT_LIMIT_SLOWDOWNS,
LOCKED_L0_FILE_COUNT_LIMIT_SLOWDOWNS,
MEMTABLE_LIMIT_STOPS,
MEMTABLE_LIMIT_SLOWDOWNS,
L0_FILE_COUNT_LIMIT_STOPS,
LOCKED_L0_FILE_COUNT_LIMIT_STOPS,
PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS,
PENDING_COMPACTION_BYTES_LIMIT_STOPS,
WRITE_STALLS_ENUM_MAX,
BYTES_FLUSHED,
BYTES_INGESTED_ADD_FILE,
INGESTED_NUM_FILES_TOTAL,
INGESTED_LEVEL0_NUM_FILES_TOTAL,
INGESTED_NUM_KEYS_TOTAL,
INTERNAL_CF_STATS_ENUM_MAX,
};
enum InternalDBStatsType {
kIntStatsWalFileBytes,
kIntStatsWalFileSynced,
kIntStatsBytesWritten,
kIntStatsNumKeysWritten,
kIntStatsWriteDoneByOther,
kIntStatsWriteDoneBySelf,
kIntStatsWriteWithWal,
kIntStatsWriteStallMicros,
kIntStatsNumMax,
};
InternalStats(int /*num_levels*/, Env* /*env*/, ColumnFamilyData* /*cfd*/) {}
struct CompactionStats {
uint64_t micros;
uint64_t cpu_micros;
uint64_t bytes_read_non_output_levels;
uint64_t bytes_read_output_level;
uint64_t bytes_written;
uint64_t bytes_moved;
int num_input_files_in_non_output_levels;
int num_input_files_in_output_level;
int num_output_files;
uint64_t num_input_records;
uint64_t num_dropped_records;
int count;
explicit CompactionStats() {}
explicit CompactionStats(CompactionReason /*reason*/, int /*c*/) {}
explicit CompactionStats(const CompactionStats& /*c*/) {}
void Add(const CompactionStats& /*c*/) {}
void Subtract(const CompactionStats& /*c*/) {}
};
void AddCompactionStats(int /*level*/, Env::Priority /*thread_pri*/,
const CompactionStats& /*stats*/) {}
void IncBytesMoved(int /*level*/, uint64_t /*amount*/) {}
void AddCFStats(InternalCFStatsType /*type*/, uint64_t /*value*/) {}
void AddDBStats(InternalDBStatsType /*type*/, uint64_t /*value*/,
bool /*concurrent */ = false) {}
HistogramImpl* GetFileReadHist(int /*level*/) { return nullptr; }
uint64_t GetBackgroundErrorCount() const { return 0; }
uint64_t BumpAndGetBackgroundErrorCount() { return 0; }
bool GetStringProperty(const DBPropertyInfo& /*property_info*/,
const Slice& /*property*/, std::string* /*value*/) {
return false;
}
bool GetMapProperty(const DBPropertyInfo& /*property_info*/,
const Slice& /*property*/,
std::map<std::string, std::string>* /*value*/) {
return false;
}
bool GetIntProperty(const DBPropertyInfo& /*property_info*/, uint64_t* /*value*/,
DBImpl* /*db*/) const {
return false;
}
bool GetIntPropertyOutOfMutex(const DBPropertyInfo& /*property_info*/,
Version* /*version*/, uint64_t* /*value*/) const {
return false;
}
};
#endif // !ROCKSDB_LITE
} // namespace rocksdb
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