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Several easy-to-add properties related to compaction and flushes

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Summary: To partly address the request @nkg- raised, add three easy-to-add properties to compactions and flushes.

Test Plan: run unit tests and add a new unit test to cover new properties.

Reviewers: haobo, dhruba

Reviewed By: dhruba

CC: nkg-, leveldb

Differential Revision: https://reviews.facebook.net/D13677
main
Kai Liu 10 years ago committed by sdong
parent 758fa8c359
commit 1ec72b37b1
6 changed files with 429 additions and 273 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 5
      db/db_impl.cc
  2. 88
      db/db_test.cc
  3. 583
      db/internal_stats.cc
  4. 22
      db/internal_stats.h
  5. 2
      db/memtable_list.cc
  6. 2
      db/memtable_list.h

5
db/db_impl.cc
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@ -3696,9 +3696,10 @@ const Options& DBImpl::GetOptions() const {
bool DBImpl::GetProperty(const Slice& property, std::string* value) {
value->clear();
DBPropertyType property_type = GetPropertyType(property);
MutexLock l(&mutex_);
return internal_stats_.GetProperty(property, value, versions_.get(),
imm_.size());
return internal_stats_.GetProperty(property_type, property, value,
versions_.get(), imm_);
}
void DBImpl::GetApproximateSizes(

88
db/db_test.cc
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@ -2055,6 +2055,94 @@ TEST(DBTest, NumImmutableMemTable) {
} while (ChangeCompactOptions());
}
class SleepingBackgroundTask {
public:
explicit SleepingBackgroundTask(Env* env)
: env_(env), bg_cv_(&mutex_), should_sleep_(true) {}
void DoSleep() {
MutexLock l(&mutex_);
while (should_sleep_) {
bg_cv_.Wait();
}
}
void WakeUp() {
MutexLock l(&mutex_);
should_sleep_ = false;
bg_cv_.SignalAll();
}
static void DoSleepTask(void* arg) {
reinterpret_cast<SleepingBackgroundTask*>(arg)->DoSleep();
}
private:
const Env* env_;
port::Mutex mutex_;
port::CondVar bg_cv_; // Signalled when background work finishes
bool should_sleep_;
};
TEST(DBTest, GetProperty) {
// Set sizes to both background thread pool to be 1 and block them.
env_->SetBackgroundThreads(1, Env::HIGH);
env_->SetBackgroundThreads(1, Env::LOW);
SleepingBackgroundTask sleeping_task_low(env_);
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::LOW);
SleepingBackgroundTask sleeping_task_high(env_);
env_->Schedule(&SleepingBackgroundTask::DoSleepTask, &sleeping_task_high,
Env::Priority::HIGH);
Options options = CurrentOptions();
WriteOptions writeOpt = WriteOptions();
writeOpt.disableWAL = true;
options.compaction_style = kCompactionStyleUniversal;
options.level0_file_num_compaction_trigger = 1;
options.compaction_options_universal.size_ratio = 50;
options.max_background_compactions = 1;
options.max_background_flushes = 1;
options.max_write_buffer_number = 10;
options.min_write_buffer_number_to_merge = 1;
options.write_buffer_size = 1000000;
Reopen(&options);
std::string big_value(1000000 * 2, 'x');
std::string num;
SetPerfLevel(kEnableTime);
ASSERT_OK(dbfull()->Put(writeOpt, "k1", big_value));
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.num-immutable-mem-table", &num));
ASSERT_EQ(num, "0");
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.mem-table-flush-pending", &num));
ASSERT_EQ(num, "0");
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.compaction-pending", &num));
ASSERT_EQ(num, "0");
perf_context.Reset();
ASSERT_OK(dbfull()->Put(writeOpt, "k2", big_value));
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.num-immutable-mem-table", &num));
ASSERT_EQ(num, "1");
ASSERT_OK(dbfull()->Put(writeOpt, "k3", big_value));
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.num-immutable-mem-table", &num));
ASSERT_EQ(num, "2");
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.mem-table-flush-pending", &num));
ASSERT_EQ(num, "1");
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.compaction-pending", &num));
ASSERT_EQ(num, "0");
sleeping_task_high.WakeUp();
dbfull()->TEST_WaitForFlushMemTable();
ASSERT_OK(dbfull()->Put(writeOpt, "k4", big_value));
ASSERT_OK(dbfull()->Put(writeOpt, "k5", big_value));
dbfull()->TEST_WaitForFlushMemTable();
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.mem-table-flush-pending", &num));
ASSERT_EQ(num, "0");
ASSERT_TRUE(dbfull()->GetProperty("rocksdb.compaction-pending", &num));
ASSERT_EQ(num, "1");
sleeping_task_low.WakeUp();
}
TEST(DBTest, FLUSH) {
do {
Options options = CurrentOptions();

583
db/internal_stats.cc
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@ -1,4 +1,3 @@
// 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.
@ -8,291 +7,341 @@
// 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 {
bool InternalStats::GetProperty(const Slice& property, std::string* value,
VersionSet* version_set, int immsize) {
Version* current = version_set->current();
DBPropertyType GetPropertyType(const Slice& property) {
Slice in = property;
Slice prefix("rocksdb.");
if (!in.starts_with(prefix)) return false;
if (!in.starts_with(prefix)) return kUnknown;
in.remove_prefix(prefix.size());
if (in.starts_with("num-files-at-level")) {
in.remove_prefix(strlen("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;
}
return kNumFilesAtLevel;
} else if (in == "levelstats") {
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;
return kLevelStats;
} else if (in == "stats") {
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);
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 MemtableFlushPending;
} else if (in == "compaction-pending") {
return CompactionPending;
}
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);
// 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];
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);
}
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;
} else if (in == "sstables") {
*value = current->DebugString();
return true;
} else if (in == "num-immutable-mem-table") {
*value = std::to_string(immsize);
return true;
}
// 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);
return false;
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 MemtableFlushPending:
// Return number of mem tables that are ready to flush (made immutable)
*value = std::to_string(imm.IsFlushPending() ? 1 : 0);
return true;
case CompactionPending:
// 1 if the system already determines at least one compacdtion is needed.
// 0 otherwise,
*value = std::to_string(current->NeedsCompaction() ? 1 : 0);
return true;
default:
return false;
}
}
} // namespace rocksdb

22
db/internal_stats.h
Unescape View File

@ -17,6 +17,23 @@
#include <string>
namespace rocksdb {
class MemTableList;
enum DBPropertyType {
kNumFilesAtLevel, // Number of files at a specific level
kLevelStats, // Return number of files and total sizes of each level
kStats, // Return general statitistics of DB
kSsTables, // Return a human readable string of current SST files
kNumImmutableMemTable, // Return number of immutable mem tables
MemtableFlushPending, // Return 1 if mem table flushing is pending, otherwise
// 0.
CompactionPending, // Return 1 if a compaction is pending. Otherwise 0.
kUnknown,
};
extern DBPropertyType GetPropertyType(const Slice& property);
class InternalStats {
public:
enum WriteStallType {
@ -99,8 +116,9 @@ class InternalStats {
stall_leveln_slowdown_count_[level] += micros;
}
bool GetProperty(const Slice& property, std::string* value,
VersionSet* version_set, int immsize);
bool GetProperty(DBPropertyType property_type, const Slice& property,
std::string* value, VersionSet* version_set,
const MemTableList& imm);
private:
std::vector<CompactionStats> compaction_stats_;

2
db/memtable_list.cc
Unescape View File

@ -92,7 +92,7 @@ void MemTableListVersion::Remove(MemTable* m) {
// Returns true if there is at least one memtable on which flush has
// not yet started.
bool MemTableList::IsFlushPending() {
bool MemTableList::IsFlushPending() const {
if ((flush_requested_ && num_flush_not_started_ >= 1) ||
(num_flush_not_started_ >= min_write_buffer_number_to_merge_)) {
assert(imm_flush_needed.NoBarrier_Load() != nullptr);

2
db/memtable_list.h
Unescape View File

@ -86,7 +86,7 @@ class MemTableList {
// Returns true if there is at least one memtable on which flush has
// not yet started.
bool IsFlushPending();
bool IsFlushPending() const;
// Returns the earliest memtables that needs to be flushed. The returned
// memtables are guaranteed to be in the ascending order of created time.

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