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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/db/read_write_concern_defaults_cache_lookup_mongod.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/read_write_concern_defaults.h"
#include "mongo/db/server_options.h"
#include "mongo/logv2/log.h"
#include "mongo/util/fail_point.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace {
MONGO_FAIL_POINT_DEFINE(failRWCDefaultsLookup);
BSONObj getPersistedDefaultRWConcernDocument(OperationContext* opCtx) {
uassert(51762,
"Failing read/write concern persisted defaults lookup because of fail point",
!MONGO_unlikely(failRWCDefaultsLookup.shouldFail()));
DBDirectClient client(opCtx);
return client.findOne(NamespaceString::kConfigSettingsNamespace,
BSON("_id" << ReadWriteConcernDefaults::kPersistedDocumentId));
}
} // namespace
boost::optional<RWConcernDefault> readWriteConcernDefaultsCacheLookupMongoD(
OperationContext* opCtx) {
// Note that a default constructed RWConcern is returned if no document is found instead of
// boost::none. This is to avoid excessive lookups when there is no defaults document, because
// otherwise every attempt to get the defaults from the RWC cache would trigger a lookup.
return RWConcernDefault::parse(IDLParserContext("ReadWriteConcernDefaultsCacheLookupMongoD"),
getPersistedDefaultRWConcernDocument(opCtx));
}
void readWriteConcernDefaultsMongodStartupChecks(OperationContext* opCtx) {
if (serverGlobalParams.clusterRole.has(ClusterRole::ShardServer)) {
DBDirectClient client(opCtx);
const auto numPersistedDocuments =
client.count(NamespaceString::kConfigSettingsNamespace,
BSON("_id" << ReadWriteConcernDefaults::kPersistedDocumentId));
if (numPersistedDocuments != 0) {
LOGV2_OPTIONS(
4615613,
{logv2::LogTag::kStartupWarnings},
"This node is running as a shard server, but persisted Read/Write Concern (RWC) "
"defaults are present in {configSettingsNamespace}. This node was likely "
"previously in an unsharded replica set or a config server. The RWC defaults on "
"this node will not be used",
"This node is running as a shard server, but persisted Read/Write Concern (RWC) "
"defaults are present. This node was likely previously in an unsharded replica set "
"or a config server. The RWC defaults on this node will not be used",
"configSettingsNamespace"_attr = NamespaceString::kConfigSettingsNamespace);
}
}
}
} // namespace mongo
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