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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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kStorage
#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/collection.h"
#include "mongo/db/catalog/collection_catalog.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/concurrency/lock_manager_defs.h"
#include "mongo/db/concurrency/locker.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/record_store.h"
#include "mongo/logv2/log.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/exit.h"
#include "mongo/util/time_support.h"
namespace mongo {
bool OplogCapMaintainerThread::_deleteExcessDocuments() {
if (!getGlobalServiceContext()->getStorageEngine()) {
LOGV2_DEBUG(22240, 2, "OplogCapMaintainerThread: no global storage engine yet");
return false;
}
const ServiceContext::UniqueOperationContext opCtx = cc().makeOperationContext();
// Non-replicated writes will not contribute to replication lag and can be safely excluded from
// Flow Control.
opCtx->setShouldParticipateInFlowControl(false);
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.
ShouldNotConflictWithSecondaryBatchApplicationBlock shouldNotConflictBlock(
opCtx.get()->lockState());
Lock::GlobalLock lk(opCtx.get(), MODE_IX);
RecordStore* rs = nullptr;
NamespaceString oplogNss = NamespaceString::kRsOplogNamespace;
{
// Release the database lock right away because we don't want to
// block other operations on the local database and given the
// fact that oplog collection is so special, Global IX lock can
// make sure the collection exists.
Lock::DBLock dbLock(opCtx.get(), oplogNss.db(), MODE_IX);
auto databaseHolder = DatabaseHolder::get(opCtx.get());
auto db = databaseHolder->getDb(opCtx.get(), oplogNss.db());
if (!db) {
LOGV2_DEBUG(22241, 2, "no local database yet");
return false;
}
// We need to hold the database lock while getting the collection. Otherwise a
// concurrent collection creation would write to the map in the Database object
// while we concurrently read the map.
Collection* collection = CollectionCatalog::get(opCtx.get())
.lookupCollectionByNamespace(opCtx.get(), oplogNss);
if (!collection) {
LOGV2_DEBUG(22242, 2, "no collection {oplogNss}", "oplogNss"_attr = oplogNss);
return false;
}
rs = collection->getRecordStore();
}
if (!rs->yieldAndAwaitOplogDeletionRequest(opCtx.get())) {
return false; // Oplog went away.
}
rs->reclaimOplog(opCtx.get());
} catch (const ExceptionForCat<ErrorCategory::Interruption>&) {
return false;
} catch (const std::exception& e) {
LOGV2_FATAL_NOTRACE(
22243, "error in OplogCapMaintainerThread: {e_what}", "e_what"_attr = e.what());
} catch (...) {
fassertFailedNoTrace(!"unknown error in OplogCapMaintainerThread");
}
return true;
}
void OplogCapMaintainerThread::run() {
ThreadClient tc(_name, getGlobalServiceContext());
while (!globalInShutdownDeprecated()) {
if (!_deleteExcessDocuments()) {
sleepmillis(1000); // Back off in case there were problems deleting.
}
}
}
} // namespace mongo
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