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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include "mongo/db/storage/control/storage_control.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/control/journal_flusher.h"
#include "mongo/logv2/log.h"
namespace mongo {
namespace StorageControl {
namespace {
bool areControlsStarted = false;
} // namespace
void startStorageControls(ServiceContext* serviceContext, bool forTestOnly) {
auto storageEngine = serviceContext->getStorageEngine();
// Instantiate a thread to periodically, and upon request, flush writes to disk.
//
// Persisted storage engines that have a journal should periodically flush the journal to disk
// to avoid risking much user data loss across a server crash if the user is not doing {j: true}
// writes often.
//
// Non-durable, i.e. no journal, storage engines should only flush upon request because
// waitUntilDurable() will perform a checkpoint and checkpoints are costly. Periodic flushes
// will be disabled and only requests will provoke a flush.
//
// Ephemeral engines are not durable -- waitUntilDurable() returns early -- but frequent updates
// to replication's JournalListener in the waitUntilDurable() code may help update replication
// timestamps more quickly.
//
// (Note: the ephemeral engine returns false for isDurable(), so we must be careful not to
// disable it.)
std::unique_ptr<JournalFlusher> journalFlusher = std::make_unique<JournalFlusher>(
/*disablePeriodicFlushes*/ forTestOnly ||
(!storageEngine->isDurable() && !storageEngine->isEphemeral()));
journalFlusher->go();
JournalFlusher::set(serviceContext, std::move(journalFlusher));
areControlsStarted = true;
}
void stopStorageControls(ServiceContext* serviceContext, const Status& reason) {
if (areControlsStarted) {
JournalFlusher::get(serviceContext)->shutdown(reason);
}
}
void triggerJournalFlush(ServiceContext* serviceContext) {
JournalFlusher::get(serviceContext)->triggerJournalFlush();
}
void waitForJournalFlush(OperationContext* opCtx) {
JournalFlusher::get(opCtx)->waitForJournalFlush();
}
void interruptJournalFlusherForReplStateChange(ServiceContext* serviceContext) {
JournalFlusher::get(serviceContext)->interruptJournalFlusherForReplStateChange();
}
} // namespace StorageControl
} // namespace mongo
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