rocksdb/db/periodic_work_scheduler.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// 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).
#include "db/periodic_work_scheduler.h"
#include "db/db_impl/db_impl.h"
#include "rocksdb/system_clock.h"
#ifndef ROCKSDB_LITE
namespace ROCKSDB_NAMESPACE {
PeriodicWorkScheduler::PeriodicWorkScheduler(
const std::shared_ptr<SystemClock>& clock) {
timer = std::unique_ptr<Timer>(new Timer(clock.get()));
}
void PeriodicWorkScheduler::Register(DBImpl* dbi,
unsigned int stats_dump_period_sec,
unsigned int stats_persist_period_sec) {
MutexLock l(&timer_mu_);
static std::atomic<uint64_t> initial_delay(0);
timer->Start();
if (stats_dump_period_sec > 0) {
timer->Add([dbi]() { dbi->DumpStats(); }, GetTaskName(dbi, "dump_st"),
initial_delay.fetch_add(1) %
static_cast<uint64_t>(stats_dump_period_sec) *
kMicrosInSecond,
static_cast<uint64_t>(stats_dump_period_sec) * kMicrosInSecond);
}
if (stats_persist_period_sec > 0) {
timer->Add(
[dbi]() { dbi->PersistStats(); }, GetTaskName(dbi, "pst_st"),
initial_delay.fetch_add(1) %
static_cast<uint64_t>(stats_persist_period_sec) * kMicrosInSecond,
static_cast<uint64_t>(stats_persist_period_sec) * kMicrosInSecond);
}
timer->Add([dbi]() { dbi->FlushInfoLog(); },
GetTaskName(dbi, "flush_info_log"),
initial_delay.fetch_add(1) % kDefaultFlushInfoLogPeriodSec *
kMicrosInSecond,
kDefaultFlushInfoLogPeriodSec * kMicrosInSecond);
}
void PeriodicWorkScheduler::Unregister(DBImpl* dbi) {
MutexLock l(&timer_mu_);
timer->Cancel(GetTaskName(dbi, "dump_st"));
timer->Cancel(GetTaskName(dbi, "pst_st"));
timer->Cancel(GetTaskName(dbi, "flush_info_log"));
if (!timer->HasPendingTask()) {
timer->Shutdown();
}
}
PeriodicWorkScheduler* PeriodicWorkScheduler::Default() {
// Always use the default SystemClock for the scheduler, as we only use the
// NowMicros which is the same for all clocks. The Env could only be
// overridden in test.
static PeriodicWorkScheduler scheduler(SystemClock::Default());
return &scheduler;
}
std::string PeriodicWorkScheduler::GetTaskName(DBImpl* dbi,
const std::string& func_name) {
std::string db_session_id;
// TODO: Should this error be ignored?
dbi->GetDbSessionId(db_session_id).PermitUncheckedError();
return db_session_id + ":" + func_name;
}
#ifndef NDEBUG
// Get the static scheduler. For a new SystemClock, it needs to re-create the
// internal timer, so only re-create it when there's no running task. Otherwise,
// return the existing scheduler. Which means if the unittest needs to update
// MockClock, Close all db instances and then re-open them.
PeriodicWorkTestScheduler* PeriodicWorkTestScheduler::Default(
const std::shared_ptr<SystemClock>& clock) {
static PeriodicWorkTestScheduler scheduler(clock);
static port::Mutex mutex;
{
MutexLock l(&mutex);
if (scheduler.timer.get() != nullptr &&
scheduler.timer->TEST_GetPendingTaskNum() == 0) {
{
MutexLock timer_mu_guard(&scheduler.timer_mu_);
scheduler.timer->Shutdown();
}
scheduler.timer.reset(new Timer(clock.get()));
}
}
return &scheduler;
}
void PeriodicWorkTestScheduler::TEST_WaitForRun(
std::function<void()> callback) const {
if (timer != nullptr) {
timer->TEST_WaitForRun(callback);
}
}
size_t PeriodicWorkTestScheduler::TEST_GetValidTaskNum() const {
if (timer != nullptr) {
return timer->TEST_GetPendingTaskNum();
}
return 0;
}
PeriodicWorkTestScheduler::PeriodicWorkTestScheduler(
const std::shared_ptr<SystemClock>& clock)
: PeriodicWorkScheduler(clock) {}
#endif // !NDEBUG
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE