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/**
* Copyright (C) 2019-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.
*/
#include "mongo/platform/basic.h"
#include "oplog_cap_maintainer_thread.h"
#include "mongo/base/error_codes.h"
#include "mongo/base/string_data.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/client.h"
#include "mongo/db/service_context.h"
#include "mongo/logv2/log.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/exit.h"
#include "mongo/util/fail_point.h"
#include "mongo/util/time_support.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kStorage
namespace mongo {
namespace {
MONGO_FAIL_POINT_DEFINE(hangOplogCapMaintainerThread);
} // namespace
bool OplogCapMaintainerThread::_deleteExcessDocuments() {
if (!getGlobalServiceContext()->getStorageEngine()) {
LOGV2_DEBUG(22240, 2, "OplogCapMaintainerThread: no global storage engine yet");
return false;
}
const ServiceContext::UniqueOperationContext opCtx = cc().makeOperationContext();
// Maintaining the Oplog cap is crucial to the stability of the server so that we don't let the
// oplog grow unbounded. We mark the operation as having immediate priority to skip ticket
// acquisition and flow control.
ScopedAdmissionPriorityForLock priority(opCtx->lockState(),
AdmissionContext::Priority::kImmediate);
try {
// A Global IX lock should be good enough to protect the oplog truncation from
// interruptions such as restartCatalog. PBWM, database lock or collection lock is not
// needed. This improves concurrency if oplog truncation takes long time.
AutoGetOplog oplogWrite(opCtx.get(), OplogAccessMode::kWrite);
const auto& oplog = oplogWrite.getCollection();
if (!oplog) {
LOGV2_DEBUG(4562600, 2, "oplog collection does not exist");
return false;
}
auto rs = oplog->getRecordStore();
if (!rs->yieldAndAwaitOplogDeletionRequest(opCtx.get())) {
return false; // Oplog went away.
}
rs->reclaimOplog(opCtx.get());
} catch (const ExceptionFor<ErrorCodes::InterruptedDueToStorageChange>& e) {
LOGV2_DEBUG(5929700,
1,
"Caught an InterruptedDueToStorageChange exception, "
"but this thread can safely continue",
"error"_attr = e.toStatus());
} catch (const DBException& ex) {
if (!opCtx->checkForInterruptNoAssert().isOK()) {
return false;
}
LOGV2_FATAL_NOTRACE(6761100, "Error in OplogCapMaintainerThread", "error"_attr = ex);
} catch (const std::exception& e) {
LOGV2_FATAL_NOTRACE(22243, "Error in OplogCapMaintainerThread", "error"_attr = e.what());
} catch (...) {
LOGV2_FATAL_NOTRACE(5184100, "Unknown error in OplogCapMaintainerThread");
}
return true;
}
void OplogCapMaintainerThread::run() {
LOGV2_DEBUG(5295000, 1, "Oplog cap maintainer thread started", "threadName"_attr = _name);
ThreadClient tc(_name, getGlobalServiceContext());
{
stdx::lock_guard<Client> lk(*tc.get());
tc.get()->setSystemOperationUnKillableByStepdown(lk);
}
while (!globalInShutdownDeprecated()) {
if (MONGO_unlikely(hangOplogCapMaintainerThread.shouldFail())) {
LOGV2(5095500, "Hanging the oplog cap maintainer thread due to fail point");
hangOplogCapMaintainerThread.pauseWhileSet();
}
if (!_deleteExcessDocuments()) {
sleepmillis(1000); // Back off in case there were problems deleting.
}
}
}
} // namespace mongo
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