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rocksdb/db/internal_stats.cc
Peter Dillinger df5dc73bec Don't hold DB mutex for block cache entry stat scans (#8538) 
Summary:
I previously didn't notice the DB mutex was being held during
block cache entry stat scans, probably because I primarily checked for
read performance regressions, because they require the block cache and
are traditionally latency-sensitive.

This change does some refactoring to avoid holding DB mutex and to
avoid triggering and waiting for a scan in GetProperty("rocksdb.cfstats").
Some tests have to be updated because now the stats collector is
populated in the Cache aggressively on DB startup rather than lazily.
(I hope to clean up some of this added complexity in the future.)

This change also ensures proper treatment of need_out_of_mutex for
non-int DB properties.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8538

Test Plan:
Added unit test logic that uses sync points to fail if the DB mutex
is held during a scan, covering the various ways that a scan might be
triggered.

Performance test - the known impact to holding the DB mutex is on
TransactionDB, and the easiest way to see the impact is to hack the
scan code to almost always miss and take an artificially long time
scanning. Here I've injected an unconditional 5s sleep at the call to
ApplyToAllEntries.

Before (hacked):

    $ TEST_TMPDIR=/dev/shm ./db_bench.base_xxx -benchmarks=randomtransaction,stats -cache_index_and_filter_blocks=1 -bloom_bits=10 -partition_index_and_filters=1 -duration=30 -stats_dump_period_sec=12 -cache_size=100000000 -statistics -transaction_db 2>&1 | egrep 'db.db.write.micros|micros/op'
    randomtransaction :     433.219 micros/op 2308 ops/sec;    0.1 MB/s ( transactions:78999 aborts:0)
    rocksdb.db.write.micros P50 : 16.135883 P95 : 36.622503 P99 : 66.036115 P100 : 5000614.000000 COUNT : 149677 SUM : 8364856
    $ TEST_TMPDIR=/dev/shm ./db_bench.base_xxx -benchmarks=randomtransaction,stats -cache_index_and_filter_blocks=1 -bloom_bits=10 -partition_index_and_filters=1 -duration=30 -stats_dump_period_sec=12 -cache_size=100000000 -statistics -transaction_db 2>&1 | egrep 'db.db.write.micros|micros/op'
    randomtransaction :     448.802 micros/op 2228 ops/sec;    0.1 MB/s ( transactions:75999 aborts:0)
    rocksdb.db.write.micros P50 : 16.629221 P95 : 37.320607 P99 : 72.144341 P100 : 5000871.000000 COUNT : 143995 SUM : 13472323

Notice the 5s P100 write time.

After (hacked):

    $ TEST_TMPDIR=/dev/shm ./db_bench.new_xxx -benchmarks=randomtransaction,stats -cache_index_and_filter_blocks=1 -bloom_bits=10 -partition_index_and_filters=1 -duration=30 -stats_dump_period_sec=12 -cache_size=100000000 -statistics -transaction_db 2>&1 | egrep 'db.db.write.micros|micros/op'
    randomtransaction :     303.645 micros/op 3293 ops/sec;    0.1 MB/s ( transactions:98999 aborts:0)
    rocksdb.db.write.micros P50 : 16.061871 P95 : 33.978834 P99 : 60.018017 P100 : 616315.000000 COUNT : 187619 SUM : 4097407
    $ TEST_TMPDIR=/dev/shm ./db_bench.new_xxx -benchmarks=randomtransaction,stats -cache_index_and_filter_blocks=1 -bloom_bits=10 -partition_index_and_filters=1 -duration=30 -stats_dump_period_sec=12 -cache_size=100000000 -statistics -transaction_db 2>&1 | egrep 'db.db.write.micros|micros/op'
    randomtransaction :     310.383 micros/op 3221 ops/sec;    0.1 MB/s ( transactions:96999 aborts:0)
    rocksdb.db.write.micros P50 : 16.270026 P95 : 35.786844 P99 : 64.302878 P100 : 603088.000000 COUNT : 183819 SUM : 4095918

P100 write is now ~0.6s. Not good, but it's the same even if I completely bypass all the scanning code:

    $ TEST_TMPDIR=/dev/shm ./db_bench.new_skip -benchmarks=randomtransaction,stats -cache_index_and_filter_blocks=1 -bloom_bits=10 -partition_index_and_filters=1 -duration=30 -stats_dump_period_sec=12 -cache_size=100000000 -statistics -transaction_db 2>&1 | egrep 'db.db.write.micros|micros/op'
    randomtransaction :     311.365 micros/op 3211 ops/sec;    0.1 MB/s ( transactions:96999 aborts:0)
    rocksdb.db.write.micros P50 : 16.274362 P95 : 36.221184 P99 : 68.809783 P100 : 649808.000000 COUNT : 183819 SUM : 4156767
    $ TEST_TMPDIR=/dev/shm ./db_bench.new_skip -benchmarks=randomtransaction,stats -cache_index_and_filter_blocks=1 -bloom_bits=10 -partition_index_and_filters=1 -duration=30 -stats_dump_period_sec=12 -cache_size=100000000 -statistics -transaction_db 2>&1 | egrep 'db.db.write.micros|micros/op'
    randomtransaction :     308.395 micros/op 3242 ops/sec;    0.1 MB/s ( transactions:97999 aborts:0)
    rocksdb.db.write.micros P50 : 16.106222 P95 : 37.202403 P99 : 67.081875 P100 : 598091.000000 COUNT : 185714 SUM : 4098832

No substantial difference.

Reviewed By: siying

Differential Revision: D29738847

Pulled By: pdillinger

fbshipit-source-id: 1c5c155f5a1b62e4fea0fd4eeb515a8b7474027b
2021-07-16 14:13:08 -07:00

1687 lines
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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 <cstddef>
#include <limits>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#include "cache/cache_entry_roles.h"
#include "cache/cache_entry_stats.h"
#include "db/column_family.h"
#include "db/db_impl/db_impl.h"
#include "rocksdb/system_clock.h"
#include "rocksdb/table.h"
#include "table/block_based/cachable_entry.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 block_cache_entry_stats = "block-cache-entry-stats";
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::kBlockCacheEntryStats =
rocksdb_prefix + block_cache_entry_stats;
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::kBlockCacheEntryStats,
{true, &InternalStats::HandleBlockCacheEntryStats, nullptr,
&InternalStats::HandleBlockCacheEntryStatsMap, 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,
{true, nullptr, nullptr, nullptr,
&DBImpl::GetPropertyHandleOptionsStatistics}},
};
InternalStats::InternalStats(int num_levels, SystemClock* clock,
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),
clock_(clock),
cfd_(cfd),
started_at_(clock->NowMicros()) {
Cache* block_cache = nullptr;
bool ok = GetBlockCacheForStats(&block_cache);
if (ok) {
assert(block_cache);
// Extract or create stats collector. Could fail in rare cases.
Status s = CacheEntryStatsCollector<CacheEntryRoleStats>::GetShared(
block_cache, clock_, &cache_entry_stats_collector_);
if (s.ok()) {
assert(cache_entry_stats_collector_);
} else {
assert(!cache_entry_stats_collector_);
}
} else {
assert(!block_cache);
}
}
void InternalStats::TEST_GetCacheEntryRoleStats(CacheEntryRoleStats* stats,
bool foreground) {
CollectCacheEntryStats(foreground);
if (cache_entry_stats_collector_) {
cache_entry_stats_collector_->GetStats(stats);
}
}
void InternalStats::CollectCacheEntryStats(bool foreground) {
// This function is safe to call from any thread because
// cache_entry_stats_collector_ field is const after constructor
// and ->GetStats does its own synchronization, which also suffices for
// cache_entry_stats_.
if (!cache_entry_stats_collector_) {
return; // nothing to do (e.g. no block cache)
}
// For "background" collections, strictly cap the collection time by
// expanding effective cache TTL. For foreground, be more aggressive about
// getting latest data.
int min_interval_seconds = foreground ? 10 : 180;
// 1/500 = max of 0.2% of one CPU thread
int min_interval_factor = foreground ? 10 : 500;
cache_entry_stats_collector_->CollectStats(min_interval_seconds,
min_interval_factor);
}
std::function<void(const Slice&, void*, size_t, Cache::DeleterFn)>
InternalStats::CacheEntryRoleStats::GetEntryCallback() {
return [&](const Slice& /*key*/, void* /*value*/, size_t charge,
Cache::DeleterFn deleter) {
auto e = role_map_.find(deleter);
size_t role_idx;
if (e == role_map_.end()) {
role_idx = static_cast<size_t>(CacheEntryRole::kMisc);
} else {
role_idx = static_cast<size_t>(e->second);
}
entry_counts[role_idx]++;
total_charges[role_idx] += charge;
};
}
void InternalStats::CacheEntryRoleStats::BeginCollection(
Cache* cache, SystemClock*, uint64_t start_time_micros) {
Clear();
last_start_time_micros_ = start_time_micros;
++collection_count;
role_map_ = CopyCacheDeleterRoleMap();
std::ostringstream str;
str << cache->Name() << "@" << static_cast<void*>(cache);
cache_id = str.str();
cache_capacity = cache->GetCapacity();
}
void InternalStats::CacheEntryRoleStats::EndCollection(
Cache*, SystemClock*, uint64_t end_time_micros) {
last_end_time_micros_ = end_time_micros;
}
void InternalStats::CacheEntryRoleStats::SkippedCollection() {
++copies_of_last_collection;
}
uint64_t InternalStats::CacheEntryRoleStats::GetLastDurationMicros() const {
if (last_end_time_micros_ > last_start_time_micros_) {
return last_end_time_micros_ - last_start_time_micros_;
} else {
return 0U;
}
}
std::string InternalStats::CacheEntryRoleStats::ToString(
SystemClock* clock) const {
std::ostringstream str;
str << "Block cache " << cache_id
<< " capacity: " << BytesToHumanString(cache_capacity)
<< " collections: " << collection_count
<< " last_copies: " << copies_of_last_collection
<< " last_secs: " << (GetLastDurationMicros() / 1000000.0)
<< " secs_since: "
<< ((clock->NowMicros() - last_end_time_micros_) / 1000000U) << "\n";
str << "Block cache entry stats(count,size,portion):";
for (size_t i = 0; i < kNumCacheEntryRoles; ++i) {
if (entry_counts[i] > 0) {
str << " " << kCacheEntryRoleToCamelString[i] << "(" << entry_counts[i]
<< "," << BytesToHumanString(total_charges[i]) << ","
<< (100.0 * total_charges[i] / cache_capacity) << "%)";
}
}
str << "\n";
return str.str();
}
void InternalStats::CacheEntryRoleStats::ToMap(
std::map<std::string, std::string>* values, SystemClock* clock) const {
values->clear();
auto& v = *values;
v["id"] = cache_id;
v["capacity"] = ROCKSDB_NAMESPACE::ToString(cache_capacity);
v["secs_for_last_collection"] =
ROCKSDB_NAMESPACE::ToString(GetLastDurationMicros() / 1000000.0);
v["secs_since_last_collection"] = ROCKSDB_NAMESPACE::ToString(
(clock->NowMicros() - last_end_time_micros_) / 1000000U);
for (size_t i = 0; i < kNumCacheEntryRoles; ++i) {
std::string role = kCacheEntryRoleToHyphenString[i];
v["count." + role] = ROCKSDB_NAMESPACE::ToString(entry_counts[i]);
v["bytes." + role] = ROCKSDB_NAMESPACE::ToString(total_charges[i]);
v["percent." + role] =
ROCKSDB_NAMESPACE::ToString(100.0 * total_charges[i] / cache_capacity);
}
}
bool InternalStats::HandleBlockCacheEntryStats(std::string* value,
Slice /*suffix*/) {
if (!cache_entry_stats_collector_) {
return false;
}
CollectCacheEntryStats(/*foreground*/ true);
CacheEntryRoleStats stats;
cache_entry_stats_collector_->GetStats(&stats);
*value = stats.ToString(clock_);
return true;
}
bool InternalStats::HandleBlockCacheEntryStatsMap(
std::map<std::string, std::string>* values, Slice /*suffix*/) {
if (!cache_entry_stats_collector_) {
return false;
}
CollectCacheEntryStats(/*foreground*/ true);
CacheEntryRoleStats stats;
cache_entry_stats_collector_->GetStats(&stats);
stats.ToMap(values, clock_);
return true;
}
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::GetBlockCacheForStats(Cache** block_cache) {
assert(block_cache != nullptr);
auto* table_factory = cfd_->ioptions()->table_factory.get();
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 = GetBlockCacheForStats(&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 = GetBlockCacheForStats(&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 = GetBlockCacheForStats(&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 GB, %.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);
uint64_t now_micros = clock_->NowMicros();
double seconds_up = (now_micros - 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;
// Do not gather cache entry stats during CFStats because DB
// mutex is held. Only dump last cached collection (rely on DB
// periodic stats dump to update)
if (cache_entry_stats_collector_) {
CacheEntryRoleStats stats;
// thread safe
cache_entry_stats_collector_->GetStats(&stats);
constexpr uint64_t kDayInMicros = uint64_t{86400} * 1000000U;
// Skip if stats are extremely old (> 1 day, incl not yet populated)
if (now_micros - stats.last_end_time_micros_ < kDayInMicros) {
value->append(stats.ToString(clock_));
}
}
}
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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