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rocksdb/db/internal_stats.cc

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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"
#include "db/memtable_list.h"
#include <vector>
namespace rocksdb {
DBPropertyType GetPropertyType(const Slice& property) {
Slice in = property;
Slice prefix("rocksdb.");
if (!in.starts_with(prefix)) return kUnknown;
in.remove_prefix(prefix.size());
if (in.starts_with("num-files-at-level")) {
return kNumFilesAtLevel;
} else if (in == "levelstats") {
return kLevelStats;
} else if (in == "stats") {
return kStats;
} else if (in == "sstables") {
return kSsTables;
} else if (in == "num-immutable-mem-table") {
return kNumImmutableMemTable;
} else if (in == "mem-table-flush-pending") {
return kMemtableFlushPending;
} else if (in == "compaction-pending") {
return kCompactionPending;
} else if (in == "background-errors") {
return kBackgroundErrors;
}
return kUnknown;
}
bool InternalStats::GetProperty(DBPropertyType property_type,
const Slice& property, std::string* value,
VersionSet* version_set,
const MemTableList& imm) {
Version* current = version_set->current();
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",
current->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,
current->NumLevelFiles(level),
current->NumLevelBytes(level) / 1048576.0);
value->append(buf);
}
return true;
}
case kStats: {
char buf[1000];
uint64_t wal_bytes = 0;
uint64_t wal_synced = 0;
uint64_t user_bytes_written = 0;
uint64_t write_other = 0;
uint64_t write_self = 0;
uint64_t write_with_wal = 0;
uint64_t total_bytes_written = 0;
uint64_t total_bytes_read = 0;
uint64_t micros_up = env_->NowMicros() - started_at_;
// Add "+1" to make sure seconds_up is > 0 and avoid NaN later
double seconds_up = (micros_up + 1) / 1000000.0;
uint64_t total_slowdown = 0;
uint64_t total_slowdown_count = 0;
uint64_t interval_bytes_written = 0;
uint64_t interval_bytes_read = 0;
uint64_t interval_bytes_new = 0;
double interval_seconds_up = 0;
if (statistics_) {
wal_bytes = statistics_->getTickerCount(WAL_FILE_BYTES);
wal_synced = statistics_->getTickerCount(WAL_FILE_SYNCED);
user_bytes_written = statistics_->getTickerCount(BYTES_WRITTEN);
write_other = statistics_->getTickerCount(WRITE_DONE_BY_OTHER);
write_self = statistics_->getTickerCount(WRITE_DONE_BY_SELF);
write_with_wal = statistics_->getTickerCount(WRITE_WITH_WAL);
}
// Pardon the long line but I think it is easier to read this way.
snprintf(
buf, sizeof(buf),
" Compactions\n"
"Level Files Size(MB) Score Time(sec) Read(MB) Write(MB) Rn(MB) "
" "
"Rnp1(MB) Wnew(MB) RW-Amplify Read(MB/s) Write(MB/s) Rn "
"Rnp1 "
" Wnp1 NewW Count msComp msStall Ln-stall Stall-cnt\n"
"--------------------------------------------------------------------"
"--"
"--------------------------------------------------------------------"
"--"
"----------------------------------------------------------------\n");
value->append(buf);
for (int level = 0; level < number_levels_; level++) {
int files = current->NumLevelFiles(level);
if (compaction_stats_[level].micros > 0 || files > 0) {
int64_t bytes_read = compaction_stats_[level].bytes_readn +
compaction_stats_[level].bytes_readnp1;
int64_t bytes_new = compaction_stats_[level].bytes_written -
compaction_stats_[level].bytes_readnp1;
double amplify =
(compaction_stats_[level].bytes_readn == 0)
? 0.0
: (compaction_stats_[level].bytes_written +
compaction_stats_[level].bytes_readnp1 +
compaction_stats_[level].bytes_readn) /
(double)compaction_stats_[level].bytes_readn;
total_bytes_read += bytes_read;
total_bytes_written += compaction_stats_[level].bytes_written;
uint64_t stalls = level == 0 ? (stall_counts_[LEVEL0_SLOWDOWN] +
stall_counts_[LEVEL0_NUM_FILES] +
stall_counts_[MEMTABLE_COMPACTION])
: stall_leveln_slowdown_count_[level];
double stall_us = level == 0 ? (stall_micros_[LEVEL0_SLOWDOWN] +
stall_micros_[LEVEL0_NUM_FILES] +
stall_micros_[MEMTABLE_COMPACTION])
: stall_leveln_slowdown_[level];
snprintf(buf, sizeof(buf),
"%3d %8d %8.0f %5.1f %9.0f %9.0f %9.0f %9.0f %9.0f %9.0f "
"%10.1f %9.1f %11.1f %8d %8d %8d %8d %8d %8d %9.1f %9.1f "
"%9lu\n",
level, files, current->NumLevelBytes(level) / 1048576.0,
current->NumLevelBytes(level) /
version_set->MaxBytesForLevel(level),
compaction_stats_[level].micros / 1e6,
bytes_read / 1048576.0,
compaction_stats_[level].bytes_written / 1048576.0,
compaction_stats_[level].bytes_readn / 1048576.0,
compaction_stats_[level].bytes_readnp1 / 1048576.0,
bytes_new / 1048576.0, amplify,
// +1 to avoid division by 0
(bytes_read / 1048576.0) /
((compaction_stats_[level].micros + 1) / 1000000.0),
(compaction_stats_[level].bytes_written / 1048576.0) /
((compaction_stats_[level].micros + 1) / 1000000.0),
compaction_stats_[level].files_in_leveln,
compaction_stats_[level].files_in_levelnp1,
compaction_stats_[level].files_out_levelnp1,
compaction_stats_[level].files_out_levelnp1 -
compaction_stats_[level].files_in_levelnp1,
compaction_stats_[level].count,
(int)((double)compaction_stats_[level].micros / 1000.0 /
(compaction_stats_[level].count + 1)),
(double)stall_us / 1000.0 / (stalls + 1),
stall_us / 1000000.0, (unsigned long)stalls);
total_slowdown += stall_leveln_slowdown_[level];
total_slowdown_count += stall_leveln_slowdown_count_[level];
value->append(buf);
}
}
interval_bytes_new = user_bytes_written - last_stats_.ingest_bytes_;
interval_bytes_read =
total_bytes_read - last_stats_.compaction_bytes_read_;
interval_bytes_written =
total_bytes_written - last_stats_.compaction_bytes_written_;
interval_seconds_up = seconds_up - last_stats_.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),
"Writes cumulative: %llu total, %llu batches, "
"%.1f per batch, %.2f ingest GB\n",
(unsigned long long)(write_other + write_self),
(unsigned long long)write_self,
(write_other + write_self) / (double)(write_self + 1),
user_bytes_written / (1048576.0 * 1024));
value->append(buf);
snprintf(buf, sizeof(buf),
"WAL cumulative: %llu WAL writes, %llu WAL syncs, "
"%.2f writes per sync, %.2f GB written\n",
(unsigned long long)write_with_wal,
(unsigned long long)wal_synced,
write_with_wal / (double)(wal_synced + 1),
wal_bytes / (1048576.0 * 1024));
value->append(buf);
snprintf(buf, sizeof(buf),
"Compaction IO cumulative (GB): "
"%.2f new, %.2f read, %.2f write, %.2f read+write\n",
user_bytes_written / (1048576.0 * 1024),
total_bytes_read / (1048576.0 * 1024),
total_bytes_written / (1048576.0 * 1024),
(total_bytes_read + total_bytes_written) / (1048576.0 * 1024));
value->append(buf);
snprintf(
buf, sizeof(buf),
"Compaction IO cumulative (MB/sec): "
"%.1f new, %.1f read, %.1f write, %.1f read+write\n",
user_bytes_written / 1048576.0 / seconds_up,
total_bytes_read / 1048576.0 / seconds_up,
total_bytes_written / 1048576.0 / seconds_up,
(total_bytes_read + total_bytes_written) / 1048576.0 / seconds_up);
value->append(buf);
// +1 to avoid divide by 0 and NaN
snprintf(
buf, sizeof(buf),
"Amplification cumulative: %.1f write, %.1f compaction\n",
(double)(total_bytes_written + wal_bytes) / (user_bytes_written + 1),
(double)(total_bytes_written + total_bytes_read + wal_bytes) /
(user_bytes_written + 1));
value->append(buf);
uint64_t interval_write_other = write_other - last_stats_.write_other_;
uint64_t interval_write_self = write_self - last_stats_.write_self_;
snprintf(buf, sizeof(buf),
"Writes interval: %llu total, %llu batches, "
"%.1f per batch, %.1f ingest MB\n",
(unsigned long long)(interval_write_other + interval_write_self),
(unsigned long long)interval_write_self,
(double)(interval_write_other + interval_write_self) /
(interval_write_self + 1),
(user_bytes_written - last_stats_.ingest_bytes_) / 1048576.0);
value->append(buf);
uint64_t interval_write_with_wal =
write_with_wal - last_stats_.write_with_wal_;
uint64_t interval_wal_synced = wal_synced - last_stats_.wal_synced_;
uint64_t interval_wal_bytes = wal_bytes - last_stats_.wal_bytes_;
snprintf(buf, sizeof(buf),
"WAL interval: %llu WAL writes, %llu WAL syncs, "
"%.2f writes per sync, %.2f MB written\n",
(unsigned long long)interval_write_with_wal,
(unsigned long long)interval_wal_synced,
interval_write_with_wal / (double)(interval_wal_synced + 1),
interval_wal_bytes / (1048576.0 * 1024));
value->append(buf);
snprintf(buf, sizeof(buf),
"Compaction IO interval (MB): "
"%.2f new, %.2f read, %.2f write, %.2f read+write\n",
interval_bytes_new / 1048576.0, interval_bytes_read / 1048576.0,
interval_bytes_written / 1048576.0,
(interval_bytes_read + interval_bytes_written) / 1048576.0);
value->append(buf);
snprintf(buf, sizeof(buf),
"Compaction IO interval (MB/sec): "
"%.1f new, %.1f read, %.1f write, %.1f read+write\n",
interval_bytes_new / 1048576.0 / interval_seconds_up,
interval_bytes_read / 1048576.0 / interval_seconds_up,
interval_bytes_written / 1048576.0 / interval_seconds_up,
(interval_bytes_read + interval_bytes_written) / 1048576.0 /
interval_seconds_up);
value->append(buf);
// +1 to avoid divide by 0 and NaN
snprintf(
buf, sizeof(buf),
"Amplification interval: %.1f write, %.1f compaction\n",
(double)(interval_bytes_written + wal_bytes) /
(interval_bytes_new + 1),
(double)(interval_bytes_written + interval_bytes_read + wal_bytes) /
(interval_bytes_new + 1));
value->append(buf);
snprintf(buf, sizeof(buf),
"Stalls(secs): %.3f level0_slowdown, %.3f level0_numfiles, "
"%.3f memtable_compaction, %.3f leveln_slowdown\n",
stall_micros_[LEVEL0_SLOWDOWN] / 1000000.0,
stall_micros_[LEVEL0_NUM_FILES] / 1000000.0,
stall_micros_[MEMTABLE_COMPACTION] / 1000000.0,
total_slowdown / 1000000.0);
value->append(buf);
snprintf(buf, sizeof(buf),
"Stalls(count): %lu level0_slowdown, %lu level0_numfiles, "
"%lu memtable_compaction, %lu leveln_slowdown\n",
(unsigned long)stall_counts_[LEVEL0_SLOWDOWN],
(unsigned long)stall_counts_[LEVEL0_NUM_FILES],
(unsigned long)stall_counts_[MEMTABLE_COMPACTION],
(unsigned long)total_slowdown_count);
value->append(buf);
last_stats_.compaction_bytes_read_ = total_bytes_read;
last_stats_.compaction_bytes_written_ = total_bytes_written;
last_stats_.ingest_bytes_ = user_bytes_written;
last_stats_.seconds_up_ = seconds_up;
last_stats_.wal_bytes_ = wal_bytes;
last_stats_.wal_synced_ = wal_synced;
last_stats_.write_with_wal_ = write_with_wal;
last_stats_.write_other_ = write_other;
last_stats_.write_self_ = write_self;
return true;
}
case kSsTables:
*value = current->DebugString();
return true;
case kNumImmutableMemTable:
*value = std::to_string(imm.size());
return true;
case kMemtableFlushPending:
// Return number of mem tables that are ready to flush (made immutable)
*value = std::to_string(imm.IsFlushPending() ? 1 : 0);
return true;
case kCompactionPending:
// 1 if the system already determines at least one compacdtion is needed.
// 0 otherwise,
*value = std::to_string(current->NeedsCompaction() ? 1 : 0);
return true;
/////////////
case kBackgroundErrors:
// Accumulated number of errors in background flushes or compactions.
*value = std::to_string(GetBackgroundErrorCount());
return true;
/////////
default:
return false;
}
}
} // namespace rocksdb
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