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rocksdb/db/internal_stats.cc
Andres Noetzli 014fd55adc Support for SingleDelete() 
Summary:
This patch fixes #7460559. It introduces SingleDelete as a new database
operation. This operation can be used to delete keys that were never
overwritten (no put following another put of the same key). If an overwritten
key is single deleted the behavior is undefined. Single deletion of a
non-existent key has no effect but multiple consecutive single deletions are
not allowed (see limitations).

In contrast to the conventional Delete() operation, the deletion entry is
removed along with the value when the two are lined up in a compaction. Note:
The semantics are similar to @igor's prototype that allowed to have this
behavior on the granularity of a column family (
https://reviews.facebook.net/D42093 ). This new patch, however, is more
aggressive when it comes to removing tombstones: It removes the SingleDelete
together with the value whenever there is no snapshot between them while the
older patch only did this when the sequence number of the deletion was older
than the earliest snapshot.

Most of the complex additions are in the Compaction Iterator, all other changes
should be relatively straightforward. The patch also includes basic support for
single deletions in db_stress and db_bench.

Limitations:
- Not compatible with cuckoo hash tables
- Single deletions cannot be used in combination with merges and normal
  deletions on the same key (other keys are not affected by this)
- Consecutive single deletions are currently not allowed (and older version of
  this patch supported this so it could be resurrected if needed)

Test Plan: make all check

Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor

Reviewed By: igor

Subscribers: maykov, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 11:42:56 -07:00

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// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// 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"
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <string>
#include <algorithm>
#include <vector>
#include "db/column_family.h"
#include "db/db_impl.h"
#include "util/string_util.h"
namespace rocksdb {
#ifndef ROCKSDB_LITE
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) {
snprintf(
buf, len,
"\n** Compaction Stats [%s] **\n"
"Level Files Size(MB) Score Read(GB) Rn(GB) Rnp1(GB) "
"Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) "
"Comp(sec) Comp(cnt) Avg(sec) "
"Stall(cnt) KeyIn KeyDrop\n"
"--------------------------------------------------------------------"
"-----------------------------------------------------------"
"--------------------------------------\n",
cf_name.c_str());
}
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, uint64_t stalls,
const InternalStats::CompactionStats& stats) {
uint64_t bytes_read =
stats.bytes_read_non_output_levels + stats.bytes_read_output_level;
int64_t bytes_new =
stats.bytes_written - stats.bytes_read_output_level;
double elapsed = (stats.micros + 1) / kMicrosInSec;
std::string num_input_records = NumberToHumanString(stats.num_input_records);
std::string num_dropped_records =
NumberToHumanString(stats.num_dropped_records);
snprintf(buf, len,
"%4s %6d/%-3d %8.2f %5.1f " /* Level, Files, Size(MB), 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) */
"%9.0f " /* Comp(sec) */
"%9d " /* Comp(cnt) */
"%8.3f " /* Avg(sec) */
"%10" PRIu64
" " /* Stall(cnt) */
"%7s " /* KeyIn */
"%6s\n", /* KeyDrop */
name.c_str(),
num_files, being_compacted, total_file_size / kMB, score,
bytes_read / kGB, stats.bytes_read_non_output_levels / kGB,
stats.bytes_read_output_level / kGB, stats.bytes_written / kGB,
bytes_new / kGB, stats.bytes_moved / kGB, w_amp,
bytes_read / kMB / elapsed, stats.bytes_written / kMB / elapsed,
stats.micros / kMicrosInSec, stats.count,
stats.count == 0 ? 0 : stats.micros / kMicrosInSec / stats.count,
stalls, num_input_records.c_str(), num_dropped_records.c_str());
}
}
static const std::string rocksdb_prefix = "rocksdb.";
static const std::string num_files_at_level_prefix = "num-files-at-level";
static const std::string allstats = "stats";
static const std::string sstables = "sstables";
static const std::string cfstats = "cfstats";
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_unflushed_mem_tables =
"cur-size-all-mem-tables";
static const std::string cur_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 num_live_versions = "num-live-versions";
static const std::string estimate_live_data_size = "estimate-live-data-size";
static const std::string base_level = "base-level";
static const std::string total_sst_files_size = "total-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";
const std::string DB::Properties::kNumFilesAtLevelPrefix =
rocksdb_prefix + num_files_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::kDBStats = rocksdb_prefix + dbstats;
const std::string DB::Properties::kNumImmutableMemTable =
rocksdb_prefix + num_immutable_mem_table;
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::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_unflushed_mem_tables;
const std::string DB::Properties::kSizeAllMemTables =
rocksdb_prefix + cur_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::kNumLiveVersions =
rocksdb_prefix + num_live_versions;
const std::string DB::Properties::kEstimateLiveDataSize =
rocksdb_prefix + estimate_live_data_size;
const std::string DB::Properties::kTotalSstFilesSize =
rocksdb_prefix + total_sst_files_size;
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;
DBPropertyType GetPropertyType(const Slice& property, bool* is_int_property,
bool* need_out_of_mutex) {
assert(is_int_property != nullptr);
assert(need_out_of_mutex != nullptr);
Slice in = property;
Slice prefix(rocksdb_prefix);
*need_out_of_mutex = false;
*is_int_property = false;
if (!in.starts_with(prefix)) {
return kUnknown;
}
in.remove_prefix(prefix.size());
if (in.starts_with(num_files_at_level_prefix)) {
return kNumFilesAtLevel;
} else if (in == levelstats) {
return kLevelStats;
} else if (in == allstats) {
return kStats;
} else if (in == cfstats) {
return kCFStats;
} else if (in == dbstats) {
return kDBStats;
} else if (in == sstables) {
return kSsTables;
} else if (in == aggregated_table_properties) {
return kAggregatedTableProperties;
} else if (in.starts_with(aggregated_table_properties_at_level)) {
return kAggregatedTablePropertiesAtLevel;
}
*is_int_property = true;
if (in == num_immutable_mem_table) {
return kNumImmutableMemTable;
} else if (in == num_immutable_mem_table_flushed) {
return kNumImmutableMemTableFlushed;
} else if (in == mem_table_flush_pending) {
return kMemtableFlushPending;
} else if (in == compaction_pending) {
return kCompactionPending;
} else if (in == background_errors) {
return kBackgroundErrors;
} else if (in == cur_size_active_mem_table) {
return kCurSizeActiveMemTable;
} else if (in == cur_size_unflushed_mem_tables) {
return kCurSizeAllMemTables;
} else if (in == cur_size_all_mem_tables) {
return kSizeAllMemTables;
} else if (in == num_entries_active_mem_table) {
return kNumEntriesInMutableMemtable;
} else if (in == num_entries_imm_mem_tables) {
return kNumEntriesInImmutableMemtable;
} else if (in == num_deletes_active_mem_table) {
return kNumDeletesInMutableMemtable;
} else if (in == num_deletes_imm_mem_tables) {
return kNumDeletesInImmutableMemtable;
} else if (in == estimate_num_keys) {
return kEstimatedNumKeys;
} else if (in == estimate_table_readers_mem) {
*need_out_of_mutex = true;
return kEstimatedUsageByTableReaders;
} else if (in == is_file_deletions_enabled) {
return kIsFileDeletionEnabled;
} else if (in == num_snapshots) {
return kNumSnapshots;
} else if (in == oldest_snapshot_time) {
return kOldestSnapshotTime;
} else if (in == num_live_versions) {
return kNumLiveVersions;
} else if (in == estimate_live_data_size) {
*need_out_of_mutex = true;
return kEstimateLiveDataSize;
} else if (in == base_level) {
return kBaseLevel;
} else if (in == total_sst_files_size) {
return kTotalSstFilesSize;
} else if (in == estimate_pending_comp_bytes) {
return kEstimatePendingCompactionBytes;
}
return kUnknown;
}
bool InternalStats::GetIntPropertyOutOfMutex(DBPropertyType property_type,
Version* version,
uint64_t* value) const {
assert(value != nullptr);
const auto* vstorage = cfd_->current()->storage_info();
switch (property_type) {
case kEstimatedUsageByTableReaders:
*value = (version == nullptr) ?
0 : version->GetMemoryUsageByTableReaders();
return true;
case kEstimateLiveDataSize:
*value = vstorage->EstimateLiveDataSize();
return true;
default:
return false;
}
}
bool InternalStats::GetStringProperty(DBPropertyType property_type,
const Slice& property,
std::string* value) {
assert(value != nullptr);
auto* current = cfd_->current();
const auto* vstorage = current->storage_info();
Slice in = property;
switch (property_type) {
case kNumFilesAtLevel: {
in.remove_prefix(strlen("rocksdb.num-files-at-level"));
uint64_t level;
bool ok = ConsumeDecimalNumber(&in, &level) && in.empty();
if (!ok || (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;
}
}
case kLevelStats: {
char buf[1000];
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;
}
case kStats: {
if (!GetStringProperty(kCFStats, DB::Properties::kCFStats, value)) {
return false;
}
if (!GetStringProperty(kDBStats, DB::Properties::kDBStats, value)) {
return false;
}
return true;
}
case kCFStats: {
DumpCFStats(value);
return true;
}
case kDBStats: {
DumpDBStats(value);
return true;
}
case kSsTables:
*value = current->DebugString();
return true;
case kAggregatedTableProperties: {
std::shared_ptr<const TableProperties> tp;
auto s = cfd_->current()->GetAggregatedTableProperties(&tp);
if (!s.ok()) {
return false;
}
*value = tp->ToString();
return true;
}
case kAggregatedTablePropertiesAtLevel: {
in.remove_prefix(
DB::Properties::kAggregatedTablePropertiesAtLevel.length());
uint64_t level;
bool ok = ConsumeDecimalNumber(&in, &level) && in.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;
}
*value = tp->ToString();
return true;
}
default:
return false;
}
}
bool InternalStats::GetIntProperty(DBPropertyType property_type,
uint64_t* value, DBImpl* db) const {
db->mutex_.AssertHeld();
const auto* vstorage = cfd_->current()->storage_info();
switch (property_type) {
case kNumImmutableMemTable:
*value = cfd_->imm()->NumNotFlushed();
return true;
case kNumImmutableMemTableFlushed:
*value = cfd_->imm()->NumFlushed();
return true;
case kMemtableFlushPending:
// Return number of mem tables that are ready to flush (made immutable)
*value = (cfd_->imm()->IsFlushPending() ? 1 : 0);
return true;
case kCompactionPending:
// 1 if the system already determines at least one compaction is needed.
// 0 otherwise,
*value = (cfd_->compaction_picker()->NeedsCompaction(vstorage) ? 1 : 0);
return true;
case kBackgroundErrors:
// Accumulated number of errors in background flushes or compactions.
*value = GetBackgroundErrorCount();
return true;
case kCurSizeActiveMemTable:
// Current size of the active memtable
*value = cfd_->mem()->ApproximateMemoryUsage();
return true;
case kCurSizeAllMemTables:
// Current size of the active memtable + immutable memtables
*value = cfd_->mem()->ApproximateMemoryUsage() +
cfd_->imm()->ApproximateUnflushedMemTablesMemoryUsage();
return true;
case kSizeAllMemTables:
*value = cfd_->mem()->ApproximateMemoryUsage() +
cfd_->imm()->ApproximateMemoryUsage();
return true;
case kNumEntriesInMutableMemtable:
// Current number of entires in the active memtable
*value = cfd_->mem()->num_entries();
return true;
case kNumEntriesInImmutableMemtable:
// Current number of entries in the immutable memtables
*value = cfd_->imm()->current()->GetTotalNumEntries();
return true;
case kNumDeletesInMutableMemtable:
// Current number of entires in the active memtable
*value = cfd_->mem()->num_deletes();
return true;
case kNumDeletesInImmutableMemtable:
// Current number of entries in the immutable memtables
*value = cfd_->imm()->current()->GetTotalNumDeletes();
return true;
case kEstimatedNumKeys:
// Estimate number of entries in the column family:
// Use estimated entries in tables + total entries in memtables.
*value = cfd_->mem()->num_entries() +
cfd_->imm()->current()->GetTotalNumEntries() -
(cfd_->mem()->num_deletes() +
cfd_->imm()->current()->GetTotalNumDeletes()) *
2 +
vstorage->GetEstimatedActiveKeys();
return true;
case kNumSnapshots:
*value = db->snapshots().count();
return true;
case kOldestSnapshotTime:
*value = static_cast<uint64_t>(db->snapshots().GetOldestSnapshotTime());
return true;
case kNumLiveVersions:
*value = cfd_->GetNumLiveVersions();
return true;
case kIsFileDeletionEnabled:
*value = db->IsFileDeletionsEnabled();
return true;
case kBaseLevel:
*value = vstorage->base_level();
return true;
case kTotalSstFilesSize:
*value = cfd_->GetTotalSstFilesSize();
return true;
case kEstimatePendingCompactionBytes:
*value = vstorage->estimated_compaction_needed_bytes();
return true;
default:
return false;
}
}
void InternalStats::DumpDBStats(std::string* value) {
char buf[1000];
// DB-level stats, only available from default column family
double seconds_up = (env_->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 = db_stats_[InternalStats::BYTES_WRITTEN];
uint64_t num_keys_written = db_stats_[InternalStats::NUMBER_KEYS_WRITTEN];
uint64_t write_other = db_stats_[InternalStats::WRITE_DONE_BY_OTHER];
uint64_t write_self = db_stats_[InternalStats::WRITE_DONE_BY_SELF];
uint64_t wal_bytes = db_stats_[InternalStats::WAL_FILE_BYTES];
uint64_t wal_synced = db_stats_[InternalStats::WAL_FILE_SYNCED];
uint64_t write_with_wal = db_stats_[InternalStats::WRITE_WITH_WAL];
uint64_t write_stall_micros = db_stats_[InternalStats::WRITE_STALL_MICROS];
uint64_t compact_bytes_read = 0;
uint64_t compact_bytes_write = 0;
uint64_t compact_micros = 0;
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
// batches: 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/batches 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 batches, "
"%.1f writes per batch, 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);
// Compact
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;
compact_bytes_write += comp_stats_[level].bytes_written;
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);
// 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 batches, "
"%.1f writes per batch, 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);
// Compaction
uint64_t interval_compact_bytes_write =
compact_bytes_write - db_stats_snapshot_.compact_bytes_write;
uint64_t interval_compact_bytes_read =
compact_bytes_read - db_stats_snapshot_.compact_bytes_read;
uint64_t interval_compact_micros =
compact_micros - db_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);
// 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);
for (int level = 0; level < number_levels_; level++) {
if (!file_read_latency_[level].Empty()) {
char buf2[5000];
snprintf(buf2, sizeof(buf2),
"** Level %d read latency histogram (micros):\n%s\n", level,
file_read_latency_[level].ToString().c_str());
value->append(buf2);
}
}
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;
db_stats_snapshot_.compact_bytes_write = compact_bytes_write;
db_stats_snapshot_.compact_bytes_read = compact_bytes_read;
db_stats_snapshot_.compact_micros = compact_micros;
}
void InternalStats::DumpCFStats(std::string* value) {
const VersionStorageInfo* vstorage = cfd_->current()->storage_info();
int num_levels_to_check =
(cfd_->ioptions()->compaction_style != kCompactionStyleFIFO)
? vstorage->num_levels() - 1
: 1;
// Compaction scores are sorted base 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];
}
}
}
char buf[1000];
// Per-ColumnFamily stats
PrintLevelStatsHeader(buf, sizeof(buf), cfd_->GetName());
value->append(buf);
CompactionStats stats_sum(0);
int total_files = 0;
int total_files_being_compacted = 0;
double total_file_size = 0;
uint64_t total_slowdown_count_soft = 0;
uint64_t total_slowdown_count_hard = 0;
uint64_t total_stall_count = 0;
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) {
uint64_t stalls =
level == 0 ? (cf_stats_count_[LEVEL0_SLOWDOWN_TOTAL] +
cf_stats_count_[LEVEL0_NUM_FILES_TOTAL] +
cf_stats_count_[HARD_PENDING_COMPACTION_BYTES_LIMIT] +
cf_stats_count_[MEMTABLE_COMPACTION])
: (stall_leveln_slowdown_count_soft_[level] +
stall_leveln_slowdown_count_hard_[level]);
stats_sum.Add(comp_stats_[level]);
total_file_size += vstorage->NumLevelBytes(level);
total_stall_count += stalls;
total_slowdown_count_soft += stall_leveln_slowdown_count_soft_[level];
total_slowdown_count_hard += stall_leveln_slowdown_count_hard_[level];
double w_amp =
(comp_stats_[level].bytes_read_non_output_levels == 0) ? 0.0
: static_cast<double>(comp_stats_[level].bytes_written) /
comp_stats_[level].bytes_read_non_output_levels;
PrintLevelStats(buf, sizeof(buf), "L" + ToString(level), files,
files_being_compacted[level],
vstorage->NumLevelBytes(level), compaction_score[level],
w_amp, stalls, comp_stats_[level]);
value->append(buf);
}
}
uint64_t curr_ingest = cf_stats_value_[BYTES_FLUSHED];
// Cumulative summary
double w_amp = stats_sum.bytes_written / static_cast<double>(curr_ingest + 1);
// Stats summary across levels
PrintLevelStats(buf, sizeof(buf), "Sum", total_files,
total_files_being_compacted, total_file_size, 0, w_amp,
total_stall_count, stats_sum);
value->append(buf);
// Interval summary
uint64_t interval_ingest =
curr_ingest - cf_stats_snapshot_.ingest_bytes + 1;
CompactionStats interval_stats(stats_sum);
interval_stats.Subtract(cf_stats_snapshot_.comp_stats);
w_amp = interval_stats.bytes_written / static_cast<double>(interval_ingest);
PrintLevelStats(buf, sizeof(buf), "Int", 0, 0, 0, 0,
w_amp, total_stall_count - cf_stats_snapshot_.stall_count,
interval_stats);
value->append(buf);
snprintf(buf, sizeof(buf),
"Flush(GB): cumulative %.3f, interval %.3f\n",
curr_ingest / kGB, interval_ingest / kGB);
value->append(buf);
snprintf(buf, sizeof(buf), "Stalls(count): %" PRIu64
" level0_slowdown, "
"%" PRIu64
" level0_slowdown_with_compaction, "
"%" PRIu64
" level0_numfiles, "
"%" PRIu64
" level0_numfiles_with_compaction, "
"%" PRIu64
" pending_compaction_bytes, "
"%" PRIu64
" memtable_compaction, "
"%" PRIu64
" leveln_slowdown_soft, "
"%" PRIu64 " leveln_slowdown_hard\n",
cf_stats_count_[LEVEL0_SLOWDOWN_TOTAL],
cf_stats_count_[LEVEL0_SLOWDOWN_WITH_COMPACTION],
cf_stats_count_[LEVEL0_NUM_FILES_TOTAL],
cf_stats_count_[LEVEL0_NUM_FILES_WITH_COMPACTION],
cf_stats_count_[HARD_PENDING_COMPACTION_BYTES_LIMIT],
cf_stats_count_[MEMTABLE_COMPACTION], total_slowdown_count_soft,
total_slowdown_count_hard);
value->append(buf);
cf_stats_snapshot_.ingest_bytes = curr_ingest;
cf_stats_snapshot_.comp_stats = stats_sum;
cf_stats_snapshot_.stall_count = total_stall_count;
}
#else
DBPropertyType GetPropertyType(const Slice& property, bool* is_int_property,
bool* need_out_of_mutex) {
return kUnknown;
}
#endif // !ROCKSDB_LITE
} // namespace rocksdb
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