mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-30 22:41:48 +00:00
141b872bd4
Summary: In preparing some seqno_to_time_mapping improvements, I found that some of the wrap-up work for creating column families was unnecessarily repeated in the case of DB::Open with create_missing_column_families. This change fixes that (`CreateColumnFamily()` -> `CreateColumnFamilyImpl()` in `DBImpl::Open()`), motivated by avoiding repeated calls to `RegisterRecordSeqnoTimeWorker()` but with the side benefit of avoiding repeated calls to `WriteOptionsFile()` for each CF. Also in this change: * Add a `Status::UpdateIfOk()` function for combining statuses in a common pattern * Rename `max_time_duration` -> `min_preserve_seconds` (include units as much as possible) * Improved comments in several places Pull Request resolved: https://github.com/facebook/rocksdb/pull/11920 Test Plan: tests added / updated Reviewed By: jaykorean Differential Revision: D49919147 Pulled By: pdillinger fbshipit-source-id: 3d0318c1d070c842c5331da0a5b415caedc104f1
109 lines
3.4 KiB
C++
109 lines
3.4 KiB
C++
// Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
//
|
|
// 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).
|
|
|
|
#pragma once
|
|
|
|
|
|
#include "util/timer.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
class SystemClock;
|
|
|
|
using PeriodicTaskFunc = std::function<void()>;
|
|
|
|
constexpr uint64_t kInvalidPeriodSec = 0;
|
|
|
|
// List of task types
|
|
enum class PeriodicTaskType : uint8_t {
|
|
kDumpStats = 0,
|
|
kPersistStats,
|
|
kFlushInfoLog,
|
|
kRecordSeqnoTime,
|
|
kMax,
|
|
};
|
|
|
|
// PeriodicTaskScheduler contains the periodic task scheduled from the DB
|
|
// instance. It's used to schedule/unschedule DumpStats(), PersistStats(),
|
|
// FlushInfoLog(), etc. Each type of the task can only have one instance,
|
|
// re-register the same task type would only update the repeat period.
|
|
//
|
|
// Internally, it uses a global single threaded timer object to run the periodic
|
|
// task functions. Timer thread will always be started since the info log
|
|
// flushing cannot be disabled.
|
|
class PeriodicTaskScheduler {
|
|
public:
|
|
explicit PeriodicTaskScheduler() = default;
|
|
|
|
PeriodicTaskScheduler(const PeriodicTaskScheduler&) = delete;
|
|
PeriodicTaskScheduler(PeriodicTaskScheduler&&) = delete;
|
|
PeriodicTaskScheduler& operator=(const PeriodicTaskScheduler&) = delete;
|
|
PeriodicTaskScheduler& operator=(PeriodicTaskScheduler&&) = delete;
|
|
|
|
// Register a task with its default repeat period. Thread safe call.
|
|
Status Register(PeriodicTaskType task_type, const PeriodicTaskFunc& fn);
|
|
|
|
// Register a task with specified repeat period. 0 is an invalid argument
|
|
// (kInvalidPeriodSec). To stop the task, please use Unregister().
|
|
// Thread safe call.
|
|
Status Register(PeriodicTaskType task_type, const PeriodicTaskFunc& fn,
|
|
uint64_t repeat_period_seconds);
|
|
|
|
// Unregister the task. Thread safe call.
|
|
Status Unregister(PeriodicTaskType task_type);
|
|
|
|
#ifndef NDEBUG
|
|
// Override the timer for the unittest
|
|
void TEST_OverrideTimer(SystemClock* clock);
|
|
|
|
// Call Timer TEST_WaitForRun() which wait until Timer starting waiting.
|
|
void TEST_WaitForRun(const std::function<void()>& callback) const {
|
|
if (timer_ != nullptr) {
|
|
timer_->TEST_WaitForRun(callback);
|
|
}
|
|
}
|
|
|
|
// Get global valid task number in the Timer
|
|
size_t TEST_GetValidTaskNum() const {
|
|
if (timer_ != nullptr) {
|
|
return timer_->TEST_GetPendingTaskNum();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// If it has the specified task type registered
|
|
bool TEST_HasTask(PeriodicTaskType task_type) const {
|
|
auto it = tasks_map_.find(task_type);
|
|
return it != tasks_map_.end();
|
|
}
|
|
#endif // NDEBUG
|
|
|
|
private:
|
|
// default global Timer instance
|
|
static Timer* Default();
|
|
|
|
// Internal structure to store task information
|
|
struct TaskInfo {
|
|
TaskInfo(std::string _name, uint64_t _repeat_every_sec)
|
|
: name(std::move(_name)), repeat_every_sec(_repeat_every_sec) {}
|
|
std::string name;
|
|
uint64_t repeat_every_sec;
|
|
};
|
|
|
|
// Internal tasks map
|
|
std::map<PeriodicTaskType, TaskInfo> tasks_map_;
|
|
|
|
// Global timer pointer, which doesn't support synchronous add/cancel tasks
|
|
// so having a global `timer_mutex` for add/cancel task.
|
|
Timer* timer_ = Default();
|
|
|
|
// Global task id, protected by the global `timer_mutex`
|
|
inline static uint64_t id_;
|
|
|
|
static constexpr uint64_t kMicrosInSecond = 1000U * 1000U;
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|