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rocksdb/db/internal_stats.cc
Levi Tamasi 0c6e4674a6 Fix a data race related to DB properties (#8206) 
Summary:
Historically, the DB properties `rocksdb.cur-size-active-mem-table`,
`rocksdb.cur-size-all-mem-tables`, and `rocksdb.size-all-mem-tables` called
the method `MemTable::ApproximateMemoryUsage` for mutable memtables,
which is not safe without synchronization. This resulted in data races with
memtable inserts. The patch changes the code handling these properties
to use `MemTable::ApproximateMemoryUsageFast` instead, which returns a
cached value backed by an atomic variable. Two test cases had to be updated
for this change. `MemoryTest.MemTableAndTableReadersTotal` was fixed by
increasing the value size used so each value ends up in its own memtable,
which was the original intention (note: the test has been broken in the sense
that the test code didn't consider that memtable sizes below 64 KB get
increased to 64 KB by `SanitizeOptions`, and has been passing only by
accident). `DBTest.MemoryUsageWithMaxWriteBufferSizeToMaintain` relies on
completely up-to-date values and thus was changed to use `ApproximateMemoryUsage`
directly instead of going through the DB properties. Note: this should be safe in this case
since there's only a single thread involved.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8206

Test Plan: `make check`

Reviewed By: riversand963

Differential Revision: D27866811

Pulled By: ltamasi

fbshipit-source-id: 7bd754d0565e0a65f1f7f0e78ffc093beef79394
2021-04-19 16:38:02 -07:00

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// 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) 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.
#include "db/internal_stats.h"
#include <algorithm>
#include <cinttypes>
#include <limits>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#include "db/column_family.h"
#include "db/db_impl/db_impl.h"
#include "rocksdb/table.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
#ifndef ROCKSDB_LITE
const std::map<LevelStatType, LevelStat> InternalStats::compaction_level_stats =
{
{LevelStatType::NUM_FILES, LevelStat{"NumFiles", "Files"}},
{LevelStatType::COMPACTED_FILES,
LevelStat{"CompactedFiles", "CompactedFiles"}},
{LevelStatType::SIZE_BYTES, LevelStat{"SizeBytes", "Size"}},
{LevelStatType::SCORE, LevelStat{"Score", "Score"}},
{LevelStatType::READ_GB, LevelStat{"ReadGB", "Read(GB)"}},
{LevelStatType::RN_GB, LevelStat{"RnGB", "Rn(GB)"}},
{LevelStatType::RNP1_GB, LevelStat{"Rnp1GB", "Rnp1(GB)"}},
{LevelStatType::WRITE_GB, LevelStat{"WriteGB", "Write(GB)"}},
{LevelStatType::W_NEW_GB, LevelStat{"WnewGB", "Wnew(GB)"}},
{LevelStatType::MOVED_GB, LevelStat{"MovedGB", "Moved(GB)"}},
{LevelStatType::WRITE_AMP, LevelStat{"WriteAmp", "W-Amp"}},
{LevelStatType::READ_MBPS, LevelStat{"ReadMBps", "Rd(MB/s)"}},
{LevelStatType::WRITE_MBPS, LevelStat{"WriteMBps", "Wr(MB/s)"}},
{LevelStatType::COMP_SEC, LevelStat{"CompSec", "Comp(sec)"}},
{LevelStatType::COMP_CPU_SEC,
LevelStat{"CompMergeCPU", "CompMergeCPU(sec)"}},
{LevelStatType::COMP_COUNT, LevelStat{"CompCount", "Comp(cnt)"}},
{LevelStatType::AVG_SEC, LevelStat{"AvgSec", "Avg(sec)"}},
{LevelStatType::KEY_IN, LevelStat{"KeyIn", "KeyIn"}},
{LevelStatType::KEY_DROP, LevelStat{"KeyDrop", "KeyDrop"}},
{LevelStatType::R_BLOB_GB, LevelStat{"RblobGB", "Rblob(GB)"}},
{LevelStatType::W_BLOB_GB, LevelStat{"WblobGB", "Wblob(GB)"}},
};
namespace {
const double kMB = 1048576.0;
const double kGB = kMB * 1024;
const double kMicrosInSec = 1000000.0;
void PrintLevelStatsHeader(char* buf, size_t len, const std::string& cf_name,
const std::string& group_by) {
int written_size =
snprintf(buf, len, "\n** Compaction Stats [%s] **\n", cf_name.c_str());
written_size = std::min(written_size, static_cast<int>(len));
auto hdr = [](LevelStatType t) {
return InternalStats::compaction_level_stats.at(t).header_name.c_str();
};
int line_size = snprintf(
buf + written_size, len - written_size,
"%s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s "
"%s\n",
// Note that we skip COMPACTED_FILES and merge it with Files column
group_by.c_str(), hdr(LevelStatType::NUM_FILES),
hdr(LevelStatType::SIZE_BYTES), hdr(LevelStatType::SCORE),
hdr(LevelStatType::READ_GB), hdr(LevelStatType::RN_GB),
hdr(LevelStatType::RNP1_GB), hdr(LevelStatType::WRITE_GB),
hdr(LevelStatType::W_NEW_GB), hdr(LevelStatType::MOVED_GB),
hdr(LevelStatType::WRITE_AMP), hdr(LevelStatType::READ_MBPS),
hdr(LevelStatType::WRITE_MBPS), hdr(LevelStatType::COMP_SEC),
hdr(LevelStatType::COMP_CPU_SEC), hdr(LevelStatType::COMP_COUNT),
hdr(LevelStatType::AVG_SEC), hdr(LevelStatType::KEY_IN),
hdr(LevelStatType::KEY_DROP), hdr(LevelStatType::R_BLOB_GB),
hdr(LevelStatType::W_BLOB_GB));
written_size += line_size;
written_size = std::min(written_size, static_cast<int>(len));
snprintf(buf + written_size, len - written_size, "%s\n",
std::string(line_size, '-').c_str());
}
void PrepareLevelStats(std::map<LevelStatType, double>* level_stats,
int num_files, int being_compacted,
double total_file_size, double score, double w_amp,
const InternalStats::CompactionStats& stats) {
const uint64_t bytes_read = stats.bytes_read_non_output_levels +
stats.bytes_read_output_level +
stats.bytes_read_blob;
const uint64_t bytes_written = stats.bytes_written + stats.bytes_written_blob;
const int64_t bytes_new = stats.bytes_written - stats.bytes_read_output_level;
const double elapsed = (stats.micros + 1) / kMicrosInSec;
(*level_stats)[LevelStatType::NUM_FILES] = num_files;
(*level_stats)[LevelStatType::COMPACTED_FILES] = being_compacted;
(*level_stats)[LevelStatType::SIZE_BYTES] = total_file_size;
(*level_stats)[LevelStatType::SCORE] = score;
(*level_stats)[LevelStatType::READ_GB] = bytes_read / kGB;
(*level_stats)[LevelStatType::RN_GB] =
stats.bytes_read_non_output_levels / kGB;
(*level_stats)[LevelStatType::RNP1_GB] = stats.bytes_read_output_level / kGB;
(*level_stats)[LevelStatType::WRITE_GB] = stats.bytes_written / kGB;
(*level_stats)[LevelStatType::W_NEW_GB] = bytes_new / kGB;
(*level_stats)[LevelStatType::MOVED_GB] = stats.bytes_moved / kGB;
(*level_stats)[LevelStatType::WRITE_AMP] = w_amp;
(*level_stats)[LevelStatType::READ_MBPS] = bytes_read / kMB / elapsed;
(*level_stats)[LevelStatType::WRITE_MBPS] = bytes_written / kMB / elapsed;
(*level_stats)[LevelStatType::COMP_SEC] = stats.micros / kMicrosInSec;
(*level_stats)[LevelStatType::COMP_CPU_SEC] = stats.cpu_micros / kMicrosInSec;
(*level_stats)[LevelStatType::COMP_COUNT] = stats.count;
(*level_stats)[LevelStatType::AVG_SEC] =
stats.count == 0 ? 0 : stats.micros / kMicrosInSec / stats.count;
(*level_stats)[LevelStatType::KEY_IN] =
static_cast<double>(stats.num_input_records);
(*level_stats)[LevelStatType::KEY_DROP] =
static_cast<double>(stats.num_dropped_records);
(*level_stats)[LevelStatType::R_BLOB_GB] = stats.bytes_read_blob / kGB;
(*level_stats)[LevelStatType::W_BLOB_GB] = stats.bytes_written_blob / kGB;
}
void PrintLevelStats(char* buf, size_t len, const std::string& name,
const std::map<LevelStatType, double>& stat_value) {
snprintf(
buf, len,
"%4s " /* Level */
"%6d/%-3d " /* Files */
"%8s " /* Size */
"%5.1f " /* Score */
"%8.1f " /* Read(GB) */
"%7.1f " /* Rn(GB) */
"%8.1f " /* Rnp1(GB) */
"%9.1f " /* Write(GB) */
"%8.1f " /* Wnew(GB) */
"%9.1f " /* Moved(GB) */
"%5.1f " /* W-Amp */
"%8.1f " /* Rd(MB/s) */
"%8.1f " /* Wr(MB/s) */
"%9.2f " /* Comp(sec) */
"%17.2f " /* CompMergeCPU(sec) */
"%9d " /* Comp(cnt) */
"%8.3f " /* Avg(sec) */
"%7s " /* KeyIn */
"%6s " /* KeyDrop */
"%9.1f " /* Rblob(GB) */
"%9.1f\n", /* Wblob(GB) */
name.c_str(), static_cast<int>(stat_value.at(LevelStatType::NUM_FILES)),
static_cast<int>(stat_value.at(LevelStatType::COMPACTED_FILES)),
BytesToHumanString(
static_cast<uint64_t>(stat_value.at(LevelStatType::SIZE_BYTES)))
.c_str(),
stat_value.at(LevelStatType::SCORE),
stat_value.at(LevelStatType::READ_GB),
stat_value.at(LevelStatType::RN_GB),
stat_value.at(LevelStatType::RNP1_GB),
stat_value.at(LevelStatType::WRITE_GB),
stat_value.at(LevelStatType::W_NEW_GB),
stat_value.at(LevelStatType::MOVED_GB),
stat_value.at(LevelStatType::WRITE_AMP),
stat_value.at(LevelStatType::READ_MBPS),
stat_value.at(LevelStatType::WRITE_MBPS),
stat_value.at(LevelStatType::COMP_SEC),
stat_value.at(LevelStatType::COMP_CPU_SEC),
static_cast<int>(stat_value.at(LevelStatType::COMP_COUNT)),
stat_value.at(LevelStatType::AVG_SEC),
NumberToHumanString(
static_cast<std::int64_t>(stat_value.at(LevelStatType::KEY_IN)))
.c_str(),
NumberToHumanString(
static_cast<std::int64_t>(stat_value.at(LevelStatType::KEY_DROP)))
.c_str(),
stat_value.at(LevelStatType::R_BLOB_GB),
stat_value.at(LevelStatType::W_BLOB_GB));
}
void PrintLevelStats(char* buf, size_t len, const std::string& name,
int num_files, int being_compacted, double total_file_size,
double score, double w_amp,
const InternalStats::CompactionStats& stats) {
std::map<LevelStatType, double> level_stats;
PrepareLevelStats(&level_stats, num_files, being_compacted, total_file_size,
score, w_amp, stats);
PrintLevelStats(buf, len, name, level_stats);
}
// Assumes that trailing numbers represent an optional argument. This requires
// property names to not end with numbers.
std::pair<Slice, Slice> GetPropertyNameAndArg(const Slice& property) {
Slice name = property, arg = property;
size_t sfx_len = 0;
while (sfx_len < property.size() &&
isdigit(property[property.size() - sfx_len - 1])) {
++sfx_len;
}
name.remove_suffix(sfx_len);
arg.remove_prefix(property.size() - sfx_len);
return {name, arg};
}
} // anonymous namespace
static const std::string rocksdb_prefix = "rocksdb.";
static const std::string num_files_at_level_prefix = "num-files-at-level";
static const std::string compression_ratio_at_level_prefix =
"compression-ratio-at-level";
static const std::string allstats = "stats";
static const std::string sstables = "sstables";
static const std::string cfstats = "cfstats";
static const std::string cfstats_no_file_histogram =
"cfstats-no-file-histogram";
static const std::string cf_file_histogram = "cf-file-histogram";
static const std::string dbstats = "dbstats";
static const std::string levelstats = "levelstats";
static const std::string num_immutable_mem_table = "num-immutable-mem-table";
static const std::string num_immutable_mem_table_flushed =
"num-immutable-mem-table-flushed";
static const std::string mem_table_flush_pending = "mem-table-flush-pending";
static const std::string compaction_pending = "compaction-pending";
static const std::string background_errors = "background-errors";
static const std::string cur_size_active_mem_table =
"cur-size-active-mem-table";
static const std::string cur_size_all_mem_tables = "cur-size-all-mem-tables";
static const std::string size_all_mem_tables = "size-all-mem-tables";
static const std::string num_entries_active_mem_table =
"num-entries-active-mem-table";
static const std::string num_entries_imm_mem_tables =
"num-entries-imm-mem-tables";
static const std::string num_deletes_active_mem_table =
"num-deletes-active-mem-table";
static const std::string num_deletes_imm_mem_tables =
"num-deletes-imm-mem-tables";
static const std::string estimate_num_keys = "estimate-num-keys";
static const std::string estimate_table_readers_mem =
"estimate-table-readers-mem";
static const std::string is_file_deletions_enabled =
"is-file-deletions-enabled";
static const std::string num_snapshots = "num-snapshots";
static const std::string oldest_snapshot_time = "oldest-snapshot-time";
static const std::string oldest_snapshot_sequence = "oldest-snapshot-sequence";
static const std::string num_live_versions = "num-live-versions";
static const std::string current_version_number =
"current-super-version-number";
static const std::string estimate_live_data_size = "estimate-live-data-size";
static const std::string min_log_number_to_keep_str = "min-log-number-to-keep";
static const std::string min_obsolete_sst_number_to_keep_str =
"min-obsolete-sst-number-to-keep";
static const std::string base_level_str = "base-level";
static const std::string total_sst_files_size = "total-sst-files-size";
static const std::string live_sst_files_size = "live-sst-files-size";
static const std::string estimate_pending_comp_bytes =
"estimate-pending-compaction-bytes";
static const std::string aggregated_table_properties =
"aggregated-table-properties";
static const std::string aggregated_table_properties_at_level =
aggregated_table_properties + "-at-level";
static const std::string num_running_compactions = "num-running-compactions";
static const std::string num_running_flushes = "num-running-flushes";
static const std::string actual_delayed_write_rate =
"actual-delayed-write-rate";
static const std::string is_write_stopped = "is-write-stopped";
static const std::string estimate_oldest_key_time = "estimate-oldest-key-time";
static const std::string block_cache_capacity = "block-cache-capacity";
static const std::string block_cache_usage = "block-cache-usage";
static const std::string block_cache_pinned_usage = "block-cache-pinned-usage";
static const std::string options_statistics = "options-statistics";
const std::string DB::Properties::kNumFilesAtLevelPrefix =
rocksdb_prefix + num_files_at_level_prefix;
const std::string DB::Properties::kCompressionRatioAtLevelPrefix =
rocksdb_prefix + compression_ratio_at_level_prefix;
const std::string DB::Properties::kStats = rocksdb_prefix + allstats;
const std::string DB::Properties::kSSTables = rocksdb_prefix + sstables;
const std::string DB::Properties::kCFStats = rocksdb_prefix + cfstats;
const std::string DB::Properties::kCFStatsNoFileHistogram =
rocksdb_prefix + cfstats_no_file_histogram;
const std::string DB::Properties::kCFFileHistogram =
rocksdb_prefix + cf_file_histogram;
const std::string DB::Properties::kDBStats = rocksdb_prefix + dbstats;
const std::string DB::Properties::kLevelStats = rocksdb_prefix + levelstats;
const std::string DB::Properties::kNumImmutableMemTable =
rocksdb_prefix + num_immutable_mem_table;
const std::string DB::Properties::kNumImmutableMemTableFlushed =
rocksdb_prefix + num_immutable_mem_table_flushed;
const std::string DB::Properties::kMemTableFlushPending =
rocksdb_prefix + mem_table_flush_pending;
const std::string DB::Properties::kCompactionPending =
rocksdb_prefix + compaction_pending;
const std::string DB::Properties::kNumRunningCompactions =
rocksdb_prefix + num_running_compactions;
const std::string DB::Properties::kNumRunningFlushes =
rocksdb_prefix + num_running_flushes;
const std::string DB::Properties::kBackgroundErrors =
rocksdb_prefix + background_errors;
const std::string DB::Properties::kCurSizeActiveMemTable =
rocksdb_prefix + cur_size_active_mem_table;
const std::string DB::Properties::kCurSizeAllMemTables =
rocksdb_prefix + cur_size_all_mem_tables;
const std::string DB::Properties::kSizeAllMemTables =
rocksdb_prefix + size_all_mem_tables;
const std::string DB::Properties::kNumEntriesActiveMemTable =
rocksdb_prefix + num_entries_active_mem_table;
const std::string DB::Properties::kNumEntriesImmMemTables =
rocksdb_prefix + num_entries_imm_mem_tables;
const std::string DB::Properties::kNumDeletesActiveMemTable =
rocksdb_prefix + num_deletes_active_mem_table;
const std::string DB::Properties::kNumDeletesImmMemTables =
rocksdb_prefix + num_deletes_imm_mem_tables;
const std::string DB::Properties::kEstimateNumKeys =
rocksdb_prefix + estimate_num_keys;
const std::string DB::Properties::kEstimateTableReadersMem =
rocksdb_prefix + estimate_table_readers_mem;
const std::string DB::Properties::kIsFileDeletionsEnabled =
rocksdb_prefix + is_file_deletions_enabled;
const std::string DB::Properties::kNumSnapshots =
rocksdb_prefix + num_snapshots;
const std::string DB::Properties::kOldestSnapshotTime =
rocksdb_prefix + oldest_snapshot_time;
const std::string DB::Properties::kOldestSnapshotSequence =
rocksdb_prefix + oldest_snapshot_sequence;
const std::string DB::Properties::kNumLiveVersions =
rocksdb_prefix + num_live_versions;
const std::string DB::Properties::kCurrentSuperVersionNumber =
rocksdb_prefix + current_version_number;
const std::string DB::Properties::kEstimateLiveDataSize =
rocksdb_prefix + estimate_live_data_size;
const std::string DB::Properties::kMinLogNumberToKeep =
rocksdb_prefix + min_log_number_to_keep_str;
const std::string DB::Properties::kMinObsoleteSstNumberToKeep =
rocksdb_prefix + min_obsolete_sst_number_to_keep_str;
const std::string DB::Properties::kTotalSstFilesSize =
rocksdb_prefix + total_sst_files_size;
const std::string DB::Properties::kLiveSstFilesSize =
rocksdb_prefix + live_sst_files_size;
const std::string DB::Properties::kBaseLevel = rocksdb_prefix + base_level_str;
const std::string DB::Properties::kEstimatePendingCompactionBytes =
rocksdb_prefix + estimate_pending_comp_bytes;
const std::string DB::Properties::kAggregatedTableProperties =
rocksdb_prefix + aggregated_table_properties;
const std::string DB::Properties::kAggregatedTablePropertiesAtLevel =
rocksdb_prefix + aggregated_table_properties_at_level;
const std::string DB::Properties::kActualDelayedWriteRate =
rocksdb_prefix + actual_delayed_write_rate;
const std::string DB::Properties::kIsWriteStopped =
rocksdb_prefix + is_write_stopped;
const std::string DB::Properties::kEstimateOldestKeyTime =
rocksdb_prefix + estimate_oldest_key_time;
const std::string DB::Properties::kBlockCacheCapacity =
rocksdb_prefix + block_cache_capacity;
const std::string DB::Properties::kBlockCacheUsage =
rocksdb_prefix + block_cache_usage;
const std::string DB::Properties::kBlockCachePinnedUsage =
rocksdb_prefix + block_cache_pinned_usage;
const std::string DB::Properties::kOptionsStatistics =
rocksdb_prefix + options_statistics;
const std::unordered_map<std::string, DBPropertyInfo>
InternalStats::ppt_name_to_info = {
{DB::Properties::kNumFilesAtLevelPrefix,
{false, &InternalStats::HandleNumFilesAtLevel, nullptr, nullptr,
nullptr}},
{DB::Properties::kCompressionRatioAtLevelPrefix,
{false, &InternalStats::HandleCompressionRatioAtLevelPrefix, nullptr,
nullptr, nullptr}},
{DB::Properties::kLevelStats,
{false, &InternalStats::HandleLevelStats, nullptr, nullptr, nullptr}},
{DB::Properties::kStats,
{false, &InternalStats::HandleStats, nullptr, nullptr, nullptr}},
{DB::Properties::kCFStats,
{false, &InternalStats::HandleCFStats, nullptr,
&InternalStats::HandleCFMapStats, nullptr}},
{DB::Properties::kCFStatsNoFileHistogram,
{false, &InternalStats::HandleCFStatsNoFileHistogram, nullptr, nullptr,
nullptr}},
{DB::Properties::kCFFileHistogram,
{false, &InternalStats::HandleCFFileHistogram, nullptr, nullptr,
nullptr}},
{DB::Properties::kDBStats,
{false, &InternalStats::HandleDBStats, nullptr, nullptr, nullptr}},
{DB::Properties::kSSTables,
{false, &InternalStats::HandleSsTables, nullptr, nullptr, nullptr}},
{DB::Properties::kAggregatedTableProperties,
{false, &InternalStats::HandleAggregatedTableProperties, nullptr,
&InternalStats::HandleAggregatedTablePropertiesMap, nullptr}},
{DB::Properties::kAggregatedTablePropertiesAtLevel,
{false, &InternalStats::HandleAggregatedTablePropertiesAtLevel,
nullptr, &InternalStats::HandleAggregatedTablePropertiesAtLevelMap,
nullptr}},
{DB::Properties::kNumImmutableMemTable,
{false, nullptr, &InternalStats::HandleNumImmutableMemTable, nullptr,
nullptr}},
{DB::Properties::kNumImmutableMemTableFlushed,
{false, nullptr, &InternalStats::HandleNumImmutableMemTableFlushed,
nullptr, nullptr}},
{DB::Properties::kMemTableFlushPending,
{false, nullptr, &InternalStats::HandleMemTableFlushPending, nullptr,
nullptr}},
{DB::Properties::kCompactionPending,
{false, nullptr, &InternalStats::HandleCompactionPending, nullptr,
nullptr}},
{DB::Properties::kBackgroundErrors,
{false, nullptr, &InternalStats::HandleBackgroundErrors, nullptr,
nullptr}},
{DB::Properties::kCurSizeActiveMemTable,
{false, nullptr, &InternalStats::HandleCurSizeActiveMemTable, nullptr,
nullptr}},
{DB::Properties::kCurSizeAllMemTables,
{false, nullptr, &InternalStats::HandleCurSizeAllMemTables, nullptr,
nullptr}},
{DB::Properties::kSizeAllMemTables,
{false, nullptr, &InternalStats::HandleSizeAllMemTables, nullptr,
nullptr}},
{DB::Properties::kNumEntriesActiveMemTable,
{false, nullptr, &InternalStats::HandleNumEntriesActiveMemTable,
nullptr, nullptr}},
{DB::Properties::kNumEntriesImmMemTables,
{false, nullptr, &InternalStats::HandleNumEntriesImmMemTables, nullptr,
nullptr}},
{DB::Properties::kNumDeletesActiveMemTable,
{false, nullptr, &InternalStats::HandleNumDeletesActiveMemTable,
nullptr, nullptr}},
{DB::Properties::kNumDeletesImmMemTables,
{false, nullptr, &InternalStats::HandleNumDeletesImmMemTables, nullptr,
nullptr}},
{DB::Properties::kEstimateNumKeys,
{false, nullptr, &InternalStats::HandleEstimateNumKeys, nullptr,
nullptr}},
{DB::Properties::kEstimateTableReadersMem,
{true, nullptr, &InternalStats::HandleEstimateTableReadersMem, nullptr,
nullptr}},
{DB::Properties::kIsFileDeletionsEnabled,
{false, nullptr, &InternalStats::HandleIsFileDeletionsEnabled, nullptr,
nullptr}},
{DB::Properties::kNumSnapshots,
{false, nullptr, &InternalStats::HandleNumSnapshots, nullptr,
nullptr}},
{DB::Properties::kOldestSnapshotTime,
{false, nullptr, &InternalStats::HandleOldestSnapshotTime, nullptr,
nullptr}},
{DB::Properties::kOldestSnapshotSequence,
{false, nullptr, &InternalStats::HandleOldestSnapshotSequence, nullptr,
nullptr}},
{DB::Properties::kNumLiveVersions,
{false, nullptr, &InternalStats::HandleNumLiveVersions, nullptr,
nullptr}},
{DB::Properties::kCurrentSuperVersionNumber,
{false, nullptr, &InternalStats::HandleCurrentSuperVersionNumber,
nullptr, nullptr}},
{DB::Properties::kEstimateLiveDataSize,
{true, nullptr, &InternalStats::HandleEstimateLiveDataSize, nullptr,
nullptr}},
{DB::Properties::kMinLogNumberToKeep,
{false, nullptr, &InternalStats::HandleMinLogNumberToKeep, nullptr,
nullptr}},
{DB::Properties::kMinObsoleteSstNumberToKeep,
{false, nullptr, &InternalStats::HandleMinObsoleteSstNumberToKeep,
nullptr, nullptr}},
{DB::Properties::kBaseLevel,
{false, nullptr, &InternalStats::HandleBaseLevel, nullptr, nullptr}},
{DB::Properties::kTotalSstFilesSize,
{false, nullptr, &InternalStats::HandleTotalSstFilesSize, nullptr,
nullptr}},
{DB::Properties::kLiveSstFilesSize,
{false, nullptr, &InternalStats::HandleLiveSstFilesSize, nullptr,
nullptr}},
{DB::Properties::kEstimatePendingCompactionBytes,
{false, nullptr, &InternalStats::HandleEstimatePendingCompactionBytes,
nullptr, nullptr}},
{DB::Properties::kNumRunningFlushes,
{false, nullptr, &InternalStats::HandleNumRunningFlushes, nullptr,
nullptr}},
{DB::Properties::kNumRunningCompactions,
{false, nullptr, &InternalStats::HandleNumRunningCompactions, nullptr,
nullptr}},
{DB::Properties::kActualDelayedWriteRate,
{false, nullptr, &InternalStats::HandleActualDelayedWriteRate, nullptr,
nullptr}},
{DB::Properties::kIsWriteStopped,
{false, nullptr, &InternalStats::HandleIsWriteStopped, nullptr,
nullptr}},
{DB::Properties::kEstimateOldestKeyTime,
{false, nullptr, &InternalStats::HandleEstimateOldestKeyTime, nullptr,
nullptr}},
{DB::Properties::kBlockCacheCapacity,
{false, nullptr, &InternalStats::HandleBlockCacheCapacity, nullptr,
nullptr}},
{DB::Properties::kBlockCacheUsage,
{false, nullptr, &InternalStats::HandleBlockCacheUsage, nullptr,
nullptr}},
{DB::Properties::kBlockCachePinnedUsage,
{false, nullptr, &InternalStats::HandleBlockCachePinnedUsage, nullptr,
nullptr}},
{DB::Properties::kOptionsStatistics,
{false, nullptr, nullptr, nullptr,
&DBImpl::GetPropertyHandleOptionsStatistics}},
};
const DBPropertyInfo* GetPropertyInfo(const Slice& property) {
std::string ppt_name = GetPropertyNameAndArg(property).first.ToString();
auto ppt_info_iter = InternalStats::ppt_name_to_info.find(ppt_name);
if (ppt_info_iter == InternalStats::ppt_name_to_info.end()) {
return nullptr;
}
return &ppt_info_iter->second;
}
bool InternalStats::GetStringProperty(const DBPropertyInfo& property_info,
const Slice& property,
std::string* value) {
assert(value != nullptr);
assert(property_info.handle_string != nullptr);
Slice arg = GetPropertyNameAndArg(property).second;
return (this->*(property_info.handle_string))(value, arg);
}
bool InternalStats::GetMapProperty(const DBPropertyInfo& property_info,
const Slice& property,
std::map<std::string, std::string>* value) {
assert(value != nullptr);
assert(property_info.handle_map != nullptr);
Slice arg = GetPropertyNameAndArg(property).second;
return (this->*(property_info.handle_map))(value, arg);
}
bool InternalStats::GetIntProperty(const DBPropertyInfo& property_info,
uint64_t* value, DBImpl* db) {
assert(value != nullptr);
assert(property_info.handle_int != nullptr &&
!property_info.need_out_of_mutex);
db->mutex_.AssertHeld();
return (this->*(property_info.handle_int))(value, db, nullptr /* version */);
}
bool InternalStats::GetIntPropertyOutOfMutex(
const DBPropertyInfo& property_info, Version* version, uint64_t* value) {
assert(value != nullptr);
assert(property_info.handle_int != nullptr &&
property_info.need_out_of_mutex);
return (this->*(property_info.handle_int))(value, nullptr /* db */, version);
}
bool InternalStats::HandleNumFilesAtLevel(std::string* value, Slice suffix) {
uint64_t level;
const auto* vstorage = cfd_->current()->storage_info();
bool ok = ConsumeDecimalNumber(&suffix, &level) && suffix.empty();
if (!ok || static_cast<int>(level) >= number_levels_) {
return false;
} else {
char buf[100];
snprintf(buf, sizeof(buf), "%d",
vstorage->NumLevelFiles(static_cast<int>(level)));
*value = buf;
return true;
}
}
bool InternalStats::HandleCompressionRatioAtLevelPrefix(std::string* value,
Slice suffix) {
uint64_t level;
const auto* vstorage = cfd_->current()->storage_info();
bool ok = ConsumeDecimalNumber(&suffix, &level) && suffix.empty();
if (!ok || level >= static_cast<uint64_t>(number_levels_)) {
return false;
}
*value = ToString(
vstorage->GetEstimatedCompressionRatioAtLevel(static_cast<int>(level)));
return true;
}
bool InternalStats::HandleLevelStats(std::string* value, Slice /*suffix*/) {
char buf[1000];
const auto* vstorage = cfd_->current()->storage_info();
snprintf(buf, sizeof(buf),
"Level Files Size(MB)\n"
"--------------------\n");
value->append(buf);
for (int level = 0; level < number_levels_; level++) {
snprintf(buf, sizeof(buf), "%3d %8d %8.0f\n", level,
vstorage->NumLevelFiles(level),
vstorage->NumLevelBytes(level) / kMB);
value->append(buf);
}
return true;
}
bool InternalStats::HandleStats(std::string* value, Slice suffix) {
if (!HandleCFStats(value, suffix)) {
return false;
}
if (!HandleDBStats(value, suffix)) {
return false;
}
return true;
}
bool InternalStats::HandleCFMapStats(
std::map<std::string, std::string>* cf_stats, Slice /*suffix*/) {
DumpCFMapStats(cf_stats);
return true;
}
bool InternalStats::HandleCFStats(std::string* value, Slice /*suffix*/) {
DumpCFStats(value);
return true;
}
bool InternalStats::HandleCFStatsNoFileHistogram(std::string* value,
Slice /*suffix*/) {
DumpCFStatsNoFileHistogram(value);
return true;
}
bool InternalStats::HandleCFFileHistogram(std::string* value,
Slice /*suffix*/) {
DumpCFFileHistogram(value);
return true;
}
bool InternalStats::HandleDBStats(std::string* value, Slice /*suffix*/) {
DumpDBStats(value);
return true;
}
bool InternalStats::HandleSsTables(std::string* value, Slice /*suffix*/) {
auto* current = cfd_->current();
*value = current->DebugString(true, true);
return true;
}
bool InternalStats::HandleAggregatedTableProperties(std::string* value,
Slice /*suffix*/) {
std::shared_ptr<const TableProperties> tp;
auto s = cfd_->current()->GetAggregatedTableProperties(&tp);
if (!s.ok()) {
return false;
}
*value = tp->ToString();
return true;
}
static std::map<std::string, std::string> MapUint64ValuesToString(
const std::map<std::string, uint64_t>& from) {
std::map<std::string, std::string> to;
for (const auto& e : from) {
to[e.first] = ToString(e.second);
}
return to;
}
bool InternalStats::HandleAggregatedTablePropertiesMap(
std::map<std::string, std::string>* values, Slice /*suffix*/) {
std::shared_ptr<const TableProperties> tp;
auto s = cfd_->current()->GetAggregatedTableProperties(&tp);
if (!s.ok()) {
return false;
}
*values = MapUint64ValuesToString(tp->GetAggregatablePropertiesAsMap());
return true;
}
bool InternalStats::HandleAggregatedTablePropertiesAtLevel(std::string* values,
Slice suffix) {
uint64_t level;
bool ok = ConsumeDecimalNumber(&suffix, &level) && suffix.empty();
if (!ok || static_cast<int>(level) >= number_levels_) {
return false;
}
std::shared_ptr<const TableProperties> tp;
auto s = cfd_->current()->GetAggregatedTableProperties(
&tp, static_cast<int>(level));
if (!s.ok()) {
return false;
}
*values = tp->ToString();
return true;
}
bool InternalStats::HandleAggregatedTablePropertiesAtLevelMap(
std::map<std::string, std::string>* values, Slice suffix) {
uint64_t level;
bool ok = ConsumeDecimalNumber(&suffix, &level) && suffix.empty();
if (!ok || static_cast<int>(level) >= number_levels_) {
return false;
}
std::shared_ptr<const TableProperties> tp;
auto s = cfd_->current()->GetAggregatedTableProperties(
&tp, static_cast<int>(level));
if (!s.ok()) {
return false;
}
*values = MapUint64ValuesToString(tp->GetAggregatablePropertiesAsMap());
return true;
}
bool InternalStats::HandleNumImmutableMemTable(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
*value = cfd_->imm()->NumNotFlushed();
return true;
}
bool InternalStats::HandleNumImmutableMemTableFlushed(uint64_t* value,
DBImpl* /*db*/,
Version* /*version*/) {
*value = cfd_->imm()->NumFlushed();
return true;
}
bool InternalStats::HandleMemTableFlushPending(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
*value = (cfd_->imm()->IsFlushPending() ? 1 : 0);
return true;
}
bool InternalStats::HandleNumRunningFlushes(uint64_t* value, DBImpl* db,
Version* /*version*/) {
*value = db->num_running_flushes();
return true;
}
bool InternalStats::HandleCompactionPending(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
// 1 if the system already determines at least one compaction is needed.
// 0 otherwise,
const auto* vstorage = cfd_->current()->storage_info();
*value = (cfd_->compaction_picker()->NeedsCompaction(vstorage) ? 1 : 0);
return true;
}
bool InternalStats::HandleNumRunningCompactions(uint64_t* value, DBImpl* db,
Version* /*version*/) {
*value = db->num_running_compactions_;
return true;
}
bool InternalStats::HandleBackgroundErrors(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
// Accumulated number of errors in background flushes or compactions.
*value = GetBackgroundErrorCount();
return true;
}
bool InternalStats::HandleCurSizeActiveMemTable(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
// Current size of the active memtable
// Using ApproximateMemoryUsageFast to avoid the need for synchronization
*value = cfd_->mem()->ApproximateMemoryUsageFast();
return true;
}
bool InternalStats::HandleCurSizeAllMemTables(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
// Current size of the active memtable + immutable memtables
// Using ApproximateMemoryUsageFast to avoid the need for synchronization
*value = cfd_->mem()->ApproximateMemoryUsageFast() +
cfd_->imm()->ApproximateUnflushedMemTablesMemoryUsage();
return true;
}
bool InternalStats::HandleSizeAllMemTables(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
// Using ApproximateMemoryUsageFast to avoid the need for synchronization
*value = cfd_->mem()->ApproximateMemoryUsageFast() +
cfd_->imm()->ApproximateMemoryUsage();
return true;
}
bool InternalStats::HandleNumEntriesActiveMemTable(uint64_t* value,
DBImpl* /*db*/,
Version* /*version*/) {
// Current number of entires in the active memtable
*value = cfd_->mem()->num_entries();
return true;
}
bool InternalStats::HandleNumEntriesImmMemTables(uint64_t* value,
DBImpl* /*db*/,
Version* /*version*/) {
// Current number of entries in the immutable memtables
*value = cfd_->imm()->current()->GetTotalNumEntries();
return true;
}
bool InternalStats::HandleNumDeletesActiveMemTable(uint64_t* value,
DBImpl* /*db*/,
Version* /*version*/) {
// Current number of entires in the active memtable
*value = cfd_->mem()->num_deletes();
return true;
}
bool InternalStats::HandleNumDeletesImmMemTables(uint64_t* value,
DBImpl* /*db*/,
Version* /*version*/) {
// Current number of entries in the immutable memtables
*value = cfd_->imm()->current()->GetTotalNumDeletes();
return true;
}
bool InternalStats::HandleEstimateNumKeys(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
// Estimate number of entries in the column family:
// Use estimated entries in tables + total entries in memtables.
const auto* vstorage = cfd_->current()->storage_info();
uint64_t estimate_keys = cfd_->mem()->num_entries() +
cfd_->imm()->current()->GetTotalNumEntries() +
vstorage->GetEstimatedActiveKeys();
uint64_t estimate_deletes =
cfd_->mem()->num_deletes() + cfd_->imm()->current()->GetTotalNumDeletes();
*value = estimate_keys > estimate_deletes * 2
? estimate_keys - (estimate_deletes * 2)
: 0;
return true;
}
bool InternalStats::HandleNumSnapshots(uint64_t* value, DBImpl* db,
Version* /*version*/) {
*value = db->snapshots().count();
return true;
}
bool InternalStats::HandleOldestSnapshotTime(uint64_t* value, DBImpl* db,
Version* /*version*/) {
*value = static_cast<uint64_t>(db->snapshots().GetOldestSnapshotTime());
return true;
}
bool InternalStats::HandleOldestSnapshotSequence(uint64_t* value, DBImpl* db,
Version* /*version*/) {
*value = static_cast<uint64_t>(db->snapshots().GetOldestSnapshotSequence());
return true;
}
bool InternalStats::HandleNumLiveVersions(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
*value = cfd_->GetNumLiveVersions();
return true;
}
bool InternalStats::HandleCurrentSuperVersionNumber(uint64_t* value,
DBImpl* /*db*/,
Version* /*version*/) {
*value = cfd_->GetSuperVersionNumber();
return true;
}
bool InternalStats::HandleIsFileDeletionsEnabled(uint64_t* value, DBImpl* db,
Version* /*version*/) {
*value = db->IsFileDeletionsEnabled() ? 1 : 0;
return true;
}
bool InternalStats::HandleBaseLevel(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
const auto* vstorage = cfd_->current()->storage_info();
*value = vstorage->base_level();
return true;
}
bool InternalStats::HandleTotalSstFilesSize(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
*value = cfd_->GetTotalSstFilesSize();
return true;
}
bool InternalStats::HandleLiveSstFilesSize(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
*value = cfd_->GetLiveSstFilesSize();
return true;
}
bool InternalStats::HandleEstimatePendingCompactionBytes(uint64_t* value,
DBImpl* /*db*/,
Version* /*version*/) {
const auto* vstorage = cfd_->current()->storage_info();
*value = vstorage->estimated_compaction_needed_bytes();
return true;
}
bool InternalStats::HandleEstimateTableReadersMem(uint64_t* value,
DBImpl* /*db*/,
Version* version) {
*value = (version == nullptr) ? 0 : version->GetMemoryUsageByTableReaders();
return true;
}
bool InternalStats::HandleEstimateLiveDataSize(uint64_t* value, DBImpl* /*db*/,
Version* version) {
const auto* vstorage = version->storage_info();
*value = vstorage->EstimateLiveDataSize();
return true;
}
bool InternalStats::HandleMinLogNumberToKeep(uint64_t* value, DBImpl* db,
Version* /*version*/) {
*value = db->MinLogNumberToKeep();
return true;
}
bool InternalStats::HandleMinObsoleteSstNumberToKeep(uint64_t* value,
DBImpl* db,
Version* /*version*/) {
*value = db->MinObsoleteSstNumberToKeep();
return true;
}
bool InternalStats::HandleActualDelayedWriteRate(uint64_t* value, DBImpl* db,
Version* /*version*/) {
const WriteController& wc = db->write_controller();
if (!wc.NeedsDelay()) {
*value = 0;
} else {
*value = wc.delayed_write_rate();
}
return true;
}
bool InternalStats::HandleIsWriteStopped(uint64_t* value, DBImpl* db,
Version* /*version*/) {
*value = db->write_controller().IsStopped() ? 1 : 0;
return true;
}
bool InternalStats::HandleEstimateOldestKeyTime(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
// TODO(yiwu): The property is currently available for fifo compaction
// with allow_compaction = false. This is because we don't propagate
// oldest_key_time on compaction.
if (cfd_->ioptions()->compaction_style != kCompactionStyleFIFO ||
cfd_->GetCurrentMutableCFOptions()
->compaction_options_fifo.allow_compaction) {
return false;
}
TablePropertiesCollection collection;
auto s = cfd_->current()->GetPropertiesOfAllTables(&collection);
if (!s.ok()) {
return false;
}
*value = std::numeric_limits<uint64_t>::max();
for (auto& p : collection) {
*value = std::min(*value, p.second->oldest_key_time);
if (*value == 0) {
break;
}
}
if (*value > 0) {
*value = std::min({cfd_->mem()->ApproximateOldestKeyTime(),
cfd_->imm()->ApproximateOldestKeyTime(), *value});
}
return *value > 0 && *value < std::numeric_limits<uint64_t>::max();
}
bool InternalStats::HandleBlockCacheStat(Cache** block_cache) {
assert(block_cache != nullptr);
auto* table_factory = cfd_->ioptions()->table_factory;
assert(table_factory != nullptr);
*block_cache =
table_factory->GetOptions<Cache>(TableFactory::kBlockCacheOpts());
return *block_cache != nullptr;
}
bool InternalStats::HandleBlockCacheCapacity(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
Cache* block_cache;
bool ok = HandleBlockCacheStat(&block_cache);
if (!ok) {
return false;
}
*value = static_cast<uint64_t>(block_cache->GetCapacity());
return true;
}
bool InternalStats::HandleBlockCacheUsage(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
Cache* block_cache;
bool ok = HandleBlockCacheStat(&block_cache);
if (!ok) {
return false;
}
*value = static_cast<uint64_t>(block_cache->GetUsage());
return true;
}
bool InternalStats::HandleBlockCachePinnedUsage(uint64_t* value, DBImpl* /*db*/,
Version* /*version*/) {
Cache* block_cache;
bool ok = HandleBlockCacheStat(&block_cache);
if (!ok) {
return false;
}
*value = static_cast<uint64_t>(block_cache->GetPinnedUsage());
return true;
}
void InternalStats::DumpDBStats(std::string* value) {
char buf[1000];
// DB-level stats, only available from default column family
double seconds_up = (clock_->NowMicros() - started_at_ + 1) / kMicrosInSec;
double interval_seconds_up = seconds_up - db_stats_snapshot_.seconds_up;
snprintf(buf, sizeof(buf),
"\n** DB Stats **\nUptime(secs): %.1f total, %.1f interval\n",
seconds_up, interval_seconds_up);
value->append(buf);
// Cumulative
uint64_t user_bytes_written =
GetDBStats(InternalStats::kIntStatsBytesWritten);
uint64_t num_keys_written =
GetDBStats(InternalStats::kIntStatsNumKeysWritten);
uint64_t write_other = GetDBStats(InternalStats::kIntStatsWriteDoneByOther);
uint64_t write_self = GetDBStats(InternalStats::kIntStatsWriteDoneBySelf);
uint64_t wal_bytes = GetDBStats(InternalStats::kIntStatsWalFileBytes);
uint64_t wal_synced = GetDBStats(InternalStats::kIntStatsWalFileSynced);
uint64_t write_with_wal = GetDBStats(InternalStats::kIntStatsWriteWithWal);
uint64_t write_stall_micros =
GetDBStats(InternalStats::kIntStatsWriteStallMicros);
const int kHumanMicrosLen = 32;
char human_micros[kHumanMicrosLen];
// Data
// writes: total number of write requests.
// keys: total number of key updates issued by all the write requests
// commit groups: number of group commits issued to the DB. Each group can
// contain one or more writes.
// so writes/keys is the average number of put in multi-put or put
// writes/groups is the average group commit size.
//
// The format is the same for interval stats.
snprintf(buf, sizeof(buf),
"Cumulative writes: %s writes, %s keys, %s commit groups, "
"%.1f writes per commit group, ingest: %.2f GB, %.2f MB/s\n",
NumberToHumanString(write_other + write_self).c_str(),
NumberToHumanString(num_keys_written).c_str(),
NumberToHumanString(write_self).c_str(),
(write_other + write_self) / static_cast<double>(write_self + 1),
user_bytes_written / kGB, user_bytes_written / kMB / seconds_up);
value->append(buf);
// WAL
snprintf(buf, sizeof(buf),
"Cumulative WAL: %s writes, %s syncs, "
"%.2f writes per sync, written: %.2f GB, %.2f MB/s\n",
NumberToHumanString(write_with_wal).c_str(),
NumberToHumanString(wal_synced).c_str(),
write_with_wal / static_cast<double>(wal_synced + 1),
wal_bytes / kGB, wal_bytes / kMB / seconds_up);
value->append(buf);
// Stall
AppendHumanMicros(write_stall_micros, human_micros, kHumanMicrosLen, true);
snprintf(buf, sizeof(buf), "Cumulative stall: %s, %.1f percent\n",
human_micros,
// 10000 = divide by 1M to get secs, then multiply by 100 for pct
write_stall_micros / 10000.0 / std::max(seconds_up, 0.001));
value->append(buf);
// Interval
uint64_t interval_write_other = write_other - db_stats_snapshot_.write_other;
uint64_t interval_write_self = write_self - db_stats_snapshot_.write_self;
uint64_t interval_num_keys_written =
num_keys_written - db_stats_snapshot_.num_keys_written;
snprintf(
buf, sizeof(buf),
"Interval writes: %s writes, %s keys, %s commit groups, "
"%.1f writes per commit group, ingest: %.2f MB, %.2f MB/s\n",
NumberToHumanString(interval_write_other + interval_write_self).c_str(),
NumberToHumanString(interval_num_keys_written).c_str(),
NumberToHumanString(interval_write_self).c_str(),
static_cast<double>(interval_write_other + interval_write_self) /
(interval_write_self + 1),
(user_bytes_written - db_stats_snapshot_.ingest_bytes) / kMB,
(user_bytes_written - db_stats_snapshot_.ingest_bytes) / kMB /
std::max(interval_seconds_up, 0.001)),
value->append(buf);
uint64_t interval_write_with_wal =
write_with_wal - db_stats_snapshot_.write_with_wal;
uint64_t interval_wal_synced = wal_synced - db_stats_snapshot_.wal_synced;
uint64_t interval_wal_bytes = wal_bytes - db_stats_snapshot_.wal_bytes;
snprintf(
buf, sizeof(buf),
"Interval WAL: %s writes, %s syncs, "
"%.2f writes per sync, written: %.2f MB, %.2f MB/s\n",
NumberToHumanString(interval_write_with_wal).c_str(),
NumberToHumanString(interval_wal_synced).c_str(),
interval_write_with_wal / static_cast<double>(interval_wal_synced + 1),
interval_wal_bytes / kGB,
interval_wal_bytes / kMB / std::max(interval_seconds_up, 0.001));
value->append(buf);
// Stall
AppendHumanMicros(write_stall_micros - db_stats_snapshot_.write_stall_micros,
human_micros, kHumanMicrosLen, true);
snprintf(buf, sizeof(buf), "Interval stall: %s, %.1f percent\n", human_micros,
// 10000 = divide by 1M to get secs, then multiply by 100 for pct
(write_stall_micros - db_stats_snapshot_.write_stall_micros) /
10000.0 / std::max(interval_seconds_up, 0.001));
value->append(buf);
db_stats_snapshot_.seconds_up = seconds_up;
db_stats_snapshot_.ingest_bytes = user_bytes_written;
db_stats_snapshot_.write_other = write_other;
db_stats_snapshot_.write_self = write_self;
db_stats_snapshot_.num_keys_written = num_keys_written;
db_stats_snapshot_.wal_bytes = wal_bytes;
db_stats_snapshot_.wal_synced = wal_synced;
db_stats_snapshot_.write_with_wal = write_with_wal;
db_stats_snapshot_.write_stall_micros = write_stall_micros;
}
/**
* Dump Compaction Level stats to a map of stat name with "compaction." prefix
* to value in double as string. The level in stat name is represented with
* a prefix "Lx" where "x" is the level number. A special level "Sum"
* represents the sum of a stat for all levels.
* The result also contains IO stall counters which keys start with "io_stalls."
* and values represent uint64 encoded as strings.
*/
void InternalStats::DumpCFMapStats(
std::map<std::string, std::string>* cf_stats) {
const VersionStorageInfo* vstorage = cfd_->current()->storage_info();
CompactionStats compaction_stats_sum;
std::map<int, std::map<LevelStatType, double>> levels_stats;
DumpCFMapStats(vstorage, &levels_stats, &compaction_stats_sum);
for (auto const& level_ent : levels_stats) {
auto level_str =
level_ent.first == -1 ? "Sum" : "L" + ToString(level_ent.first);
for (auto const& stat_ent : level_ent.second) {
auto stat_type = stat_ent.first;
auto key_str =
"compaction." + level_str + "." +
InternalStats::compaction_level_stats.at(stat_type).property_name;
(*cf_stats)[key_str] = std::to_string(stat_ent.second);
}
}
DumpCFMapStatsIOStalls(cf_stats);
}
void InternalStats::DumpCFMapStats(
const VersionStorageInfo* vstorage,
std::map<int, std::map<LevelStatType, double>>* levels_stats,
CompactionStats* compaction_stats_sum) {
assert(vstorage);
int num_levels_to_check =
(cfd_->ioptions()->compaction_style != kCompactionStyleFIFO)
? vstorage->num_levels() - 1
: 1;
// Compaction scores are sorted based on its value. Restore them to the
// level order
std::vector<double> compaction_score(number_levels_, 0);
for (int i = 0; i < num_levels_to_check; ++i) {
compaction_score[vstorage->CompactionScoreLevel(i)] =
vstorage->CompactionScore(i);
}
// Count # of files being compacted for each level
std::vector<int> files_being_compacted(number_levels_, 0);
for (int level = 0; level < number_levels_; ++level) {
for (auto* f : vstorage->LevelFiles(level)) {
if (f->being_compacted) {
++files_being_compacted[level];
}
}
}
int total_files = 0;
int total_files_being_compacted = 0;
double total_file_size = 0;
uint64_t flush_ingest = cf_stats_value_[BYTES_FLUSHED];
uint64_t add_file_ingest = cf_stats_value_[BYTES_INGESTED_ADD_FILE];
uint64_t curr_ingest = flush_ingest + add_file_ingest;
for (int level = 0; level < number_levels_; level++) {
int files = vstorage->NumLevelFiles(level);
total_files += files;
total_files_being_compacted += files_being_compacted[level];
if (comp_stats_[level].micros > 0 || files > 0) {
compaction_stats_sum->Add(comp_stats_[level]);
total_file_size += vstorage->NumLevelBytes(level);
uint64_t input_bytes;
if (level == 0) {
input_bytes = curr_ingest;
} else {
input_bytes = comp_stats_[level].bytes_read_non_output_levels +
comp_stats_[level].bytes_read_blob;
}
double w_amp =
(input_bytes == 0)
? 0.0
: static_cast<double>(comp_stats_[level].bytes_written +
comp_stats_[level].bytes_written_blob) /
input_bytes;
std::map<LevelStatType, double> level_stats;
PrepareLevelStats(&level_stats, files, files_being_compacted[level],
static_cast<double>(vstorage->NumLevelBytes(level)),
compaction_score[level], w_amp, comp_stats_[level]);
(*levels_stats)[level] = level_stats;
}
}
// Cumulative summary
double w_amp = (compaction_stats_sum->bytes_written +
compaction_stats_sum->bytes_written_blob) /
static_cast<double>(curr_ingest + 1);
// Stats summary across levels
std::map<LevelStatType, double> sum_stats;
PrepareLevelStats(&sum_stats, total_files, total_files_being_compacted,
total_file_size, 0, w_amp, *compaction_stats_sum);
(*levels_stats)[-1] = sum_stats; // -1 is for the Sum level
}
void InternalStats::DumpCFMapStatsByPriority(
std::map<int, std::map<LevelStatType, double>>* priorities_stats) {
for (size_t priority = 0; priority < comp_stats_by_pri_.size(); priority++) {
if (comp_stats_by_pri_[priority].micros > 0) {
std::map<LevelStatType, double> priority_stats;
PrepareLevelStats(&priority_stats, 0 /* num_files */,
0 /* being_compacted */, 0 /* total_file_size */,
0 /* compaction_score */, 0 /* w_amp */,
comp_stats_by_pri_[priority]);
(*priorities_stats)[static_cast<int>(priority)] = priority_stats;
}
}
}
void InternalStats::DumpCFMapStatsIOStalls(
std::map<std::string, std::string>* cf_stats) {
(*cf_stats)["io_stalls.level0_slowdown"] =
std::to_string(cf_stats_count_[L0_FILE_COUNT_LIMIT_SLOWDOWNS]);
(*cf_stats)["io_stalls.level0_slowdown_with_compaction"] =
std::to_string(cf_stats_count_[LOCKED_L0_FILE_COUNT_LIMIT_SLOWDOWNS]);
(*cf_stats)["io_stalls.level0_numfiles"] =
std::to_string(cf_stats_count_[L0_FILE_COUNT_LIMIT_STOPS]);
(*cf_stats)["io_stalls.level0_numfiles_with_compaction"] =
std::to_string(cf_stats_count_[LOCKED_L0_FILE_COUNT_LIMIT_STOPS]);
(*cf_stats)["io_stalls.stop_for_pending_compaction_bytes"] =
std::to_string(cf_stats_count_[PENDING_COMPACTION_BYTES_LIMIT_STOPS]);
(*cf_stats)["io_stalls.slowdown_for_pending_compaction_bytes"] =
std::to_string(cf_stats_count_[PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS]);
(*cf_stats)["io_stalls.memtable_compaction"] =
std::to_string(cf_stats_count_[MEMTABLE_LIMIT_STOPS]);
(*cf_stats)["io_stalls.memtable_slowdown"] =
std::to_string(cf_stats_count_[MEMTABLE_LIMIT_SLOWDOWNS]);
uint64_t total_stop = cf_stats_count_[L0_FILE_COUNT_LIMIT_STOPS] +
cf_stats_count_[PENDING_COMPACTION_BYTES_LIMIT_STOPS] +
cf_stats_count_[MEMTABLE_LIMIT_STOPS];
uint64_t total_slowdown =
cf_stats_count_[L0_FILE_COUNT_LIMIT_SLOWDOWNS] +
cf_stats_count_[PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS] +
cf_stats_count_[MEMTABLE_LIMIT_SLOWDOWNS];
(*cf_stats)["io_stalls.total_stop"] = std::to_string(total_stop);
(*cf_stats)["io_stalls.total_slowdown"] = std::to_string(total_slowdown);
}
void InternalStats::DumpCFStats(std::string* value) {
DumpCFStatsNoFileHistogram(value);
DumpCFFileHistogram(value);
}
void InternalStats::DumpCFStatsNoFileHistogram(std::string* value) {
char buf[2000];
// Per-ColumnFamily stats
PrintLevelStatsHeader(buf, sizeof(buf), cfd_->GetName(), "Level");
value->append(buf);
// Print stats for each level
const VersionStorageInfo* vstorage = cfd_->current()->storage_info();
std::map<int, std::map<LevelStatType, double>> levels_stats;
CompactionStats compaction_stats_sum;
DumpCFMapStats(vstorage, &levels_stats, &compaction_stats_sum);
for (int l = 0; l < number_levels_; ++l) {
if (levels_stats.find(l) != levels_stats.end()) {
PrintLevelStats(buf, sizeof(buf), "L" + ToString(l), levels_stats[l]);
value->append(buf);
}
}
// Print sum of level stats
PrintLevelStats(buf, sizeof(buf), "Sum", levels_stats[-1]);
value->append(buf);
uint64_t flush_ingest = cf_stats_value_[BYTES_FLUSHED];
uint64_t add_file_ingest = cf_stats_value_[BYTES_INGESTED_ADD_FILE];
uint64_t ingest_files_addfile = cf_stats_value_[INGESTED_NUM_FILES_TOTAL];
uint64_t ingest_l0_files_addfile =
cf_stats_value_[INGESTED_LEVEL0_NUM_FILES_TOTAL];
uint64_t ingest_keys_addfile = cf_stats_value_[INGESTED_NUM_KEYS_TOTAL];
// Cumulative summary
uint64_t total_stall_count =
cf_stats_count_[L0_FILE_COUNT_LIMIT_SLOWDOWNS] +
cf_stats_count_[L0_FILE_COUNT_LIMIT_STOPS] +
cf_stats_count_[PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS] +
cf_stats_count_[PENDING_COMPACTION_BYTES_LIMIT_STOPS] +
cf_stats_count_[MEMTABLE_LIMIT_STOPS] +
cf_stats_count_[MEMTABLE_LIMIT_SLOWDOWNS];
// Interval summary
uint64_t interval_flush_ingest =
flush_ingest - cf_stats_snapshot_.ingest_bytes_flush;
uint64_t interval_add_file_inget =
add_file_ingest - cf_stats_snapshot_.ingest_bytes_addfile;
uint64_t interval_ingest =
interval_flush_ingest + interval_add_file_inget + 1;
CompactionStats interval_stats(compaction_stats_sum);
interval_stats.Subtract(cf_stats_snapshot_.comp_stats);
double w_amp =
(interval_stats.bytes_written + interval_stats.bytes_written_blob) /
static_cast<double>(interval_ingest);
PrintLevelStats(buf, sizeof(buf), "Int", 0, 0, 0, 0, w_amp, interval_stats);
value->append(buf);
PrintLevelStatsHeader(buf, sizeof(buf), cfd_->GetName(), "Priority");
value->append(buf);
std::map<int, std::map<LevelStatType, double>> priorities_stats;
DumpCFMapStatsByPriority(&priorities_stats);
for (size_t priority = 0; priority < comp_stats_by_pri_.size(); ++priority) {
if (priorities_stats.find(static_cast<int>(priority)) !=
priorities_stats.end()) {
PrintLevelStats(
buf, sizeof(buf),
Env::PriorityToString(static_cast<Env::Priority>(priority)),
priorities_stats[static_cast<int>(priority)]);
value->append(buf);
}
}
snprintf(buf, sizeof(buf),
"\nBlob file count: %" ROCKSDB_PRIszt ", total size: %.1f GB\n\n",
vstorage->GetBlobFiles().size(),
vstorage->GetTotalBlobFileSize() / kGB);
value->append(buf);
double seconds_up = (clock_->NowMicros() - started_at_ + 1) / kMicrosInSec;
double interval_seconds_up = seconds_up - cf_stats_snapshot_.seconds_up;
snprintf(buf, sizeof(buf), "Uptime(secs): %.1f total, %.1f interval\n",
seconds_up, interval_seconds_up);
value->append(buf);
snprintf(buf, sizeof(buf), "Flush(GB): cumulative %.3f, interval %.3f\n",
flush_ingest / kGB, interval_flush_ingest / kGB);
value->append(buf);
snprintf(buf, sizeof(buf), "AddFile(GB): cumulative %.3f, interval %.3f\n",
add_file_ingest / kGB, interval_add_file_inget / kGB);
value->append(buf);
uint64_t interval_ingest_files_addfile =
ingest_files_addfile - cf_stats_snapshot_.ingest_files_addfile;
snprintf(buf, sizeof(buf),
"AddFile(Total Files): cumulative %" PRIu64 ", interval %" PRIu64
"\n",
ingest_files_addfile, interval_ingest_files_addfile);
value->append(buf);
uint64_t interval_ingest_l0_files_addfile =
ingest_l0_files_addfile - cf_stats_snapshot_.ingest_l0_files_addfile;
snprintf(buf, sizeof(buf),
"AddFile(L0 Files): cumulative %" PRIu64 ", interval %" PRIu64 "\n",
ingest_l0_files_addfile, interval_ingest_l0_files_addfile);
value->append(buf);
uint64_t interval_ingest_keys_addfile =
ingest_keys_addfile - cf_stats_snapshot_.ingest_keys_addfile;
snprintf(buf, sizeof(buf),
"AddFile(Keys): cumulative %" PRIu64 ", interval %" PRIu64 "\n",
ingest_keys_addfile, interval_ingest_keys_addfile);
value->append(buf);
// Compact
uint64_t compact_bytes_read = 0;
uint64_t compact_bytes_write = 0;
uint64_t compact_micros = 0;
for (int level = 0; level < number_levels_; level++) {
compact_bytes_read += comp_stats_[level].bytes_read_output_level +
comp_stats_[level].bytes_read_non_output_levels +
comp_stats_[level].bytes_read_blob;
compact_bytes_write += comp_stats_[level].bytes_written +
comp_stats_[level].bytes_written_blob;
compact_micros += comp_stats_[level].micros;
}
snprintf(buf, sizeof(buf),
"Cumulative compaction: %.2f GB write, %.2f MB/s write, "
"%.2f GB read, %.2f MB/s read, %.1f seconds\n",
compact_bytes_write / kGB, compact_bytes_write / kMB / seconds_up,
compact_bytes_read / kGB, compact_bytes_read / kMB / seconds_up,
compact_micros / kMicrosInSec);
value->append(buf);
// Compaction interval
uint64_t interval_compact_bytes_write =
compact_bytes_write - cf_stats_snapshot_.compact_bytes_write;
uint64_t interval_compact_bytes_read =
compact_bytes_read - cf_stats_snapshot_.compact_bytes_read;
uint64_t interval_compact_micros =
compact_micros - cf_stats_snapshot_.compact_micros;
snprintf(
buf, sizeof(buf),
"Interval compaction: %.2f GB write, %.2f MB/s write, "
"%.2f GB read, %.2f MB/s read, %.1f seconds\n",
interval_compact_bytes_write / kGB,
interval_compact_bytes_write / kMB / std::max(interval_seconds_up, 0.001),
interval_compact_bytes_read / kGB,
interval_compact_bytes_read / kMB / std::max(interval_seconds_up, 0.001),
interval_compact_micros / kMicrosInSec);
value->append(buf);
cf_stats_snapshot_.compact_bytes_write = compact_bytes_write;
cf_stats_snapshot_.compact_bytes_read = compact_bytes_read;
cf_stats_snapshot_.compact_micros = compact_micros;
snprintf(buf, sizeof(buf),
"Stalls(count): %" PRIu64
" level0_slowdown, "
"%" PRIu64
" level0_slowdown_with_compaction, "
"%" PRIu64
" level0_numfiles, "
"%" PRIu64
" level0_numfiles_with_compaction, "
"%" PRIu64
" stop for pending_compaction_bytes, "
"%" PRIu64
" slowdown for pending_compaction_bytes, "
"%" PRIu64
" memtable_compaction, "
"%" PRIu64
" memtable_slowdown, "
"interval %" PRIu64 " total count\n",
cf_stats_count_[L0_FILE_COUNT_LIMIT_SLOWDOWNS],
cf_stats_count_[LOCKED_L0_FILE_COUNT_LIMIT_SLOWDOWNS],
cf_stats_count_[L0_FILE_COUNT_LIMIT_STOPS],
cf_stats_count_[LOCKED_L0_FILE_COUNT_LIMIT_STOPS],
cf_stats_count_[PENDING_COMPACTION_BYTES_LIMIT_STOPS],
cf_stats_count_[PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS],
cf_stats_count_[MEMTABLE_LIMIT_STOPS],
cf_stats_count_[MEMTABLE_LIMIT_SLOWDOWNS],
total_stall_count - cf_stats_snapshot_.stall_count);
value->append(buf);
cf_stats_snapshot_.seconds_up = seconds_up;
cf_stats_snapshot_.ingest_bytes_flush = flush_ingest;
cf_stats_snapshot_.ingest_bytes_addfile = add_file_ingest;
cf_stats_snapshot_.ingest_files_addfile = ingest_files_addfile;
cf_stats_snapshot_.ingest_l0_files_addfile = ingest_l0_files_addfile;
cf_stats_snapshot_.ingest_keys_addfile = ingest_keys_addfile;
cf_stats_snapshot_.comp_stats = compaction_stats_sum;
cf_stats_snapshot_.stall_count = total_stall_count;
}
void InternalStats::DumpCFFileHistogram(std::string* value) {
assert(value);
assert(cfd_);
std::ostringstream oss;
oss << "\n** File Read Latency Histogram By Level [" << cfd_->GetName()
<< "] **\n";
for (int level = 0; level < number_levels_; level++) {
if (!file_read_latency_[level].Empty()) {
oss << "** Level " << level << " read latency histogram (micros):\n"
<< file_read_latency_[level].ToString() << '\n';
}
}
if (!blob_file_read_latency_.Empty()) {
oss << "** Blob file read latency histogram (micros):\n"
<< blob_file_read_latency_.ToString() << '\n';
}
value->append(oss.str());
}
#else
const DBPropertyInfo* GetPropertyInfo(const Slice& /*property*/) {
return nullptr;
}
#endif // !ROCKSDB_LITE
} // namespace ROCKSDB_NAMESPACE
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