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/**
* Copyright (C) 2018-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 "mongo/db/s/config_server_op_observer.h"
#include "mongo/db/s/config/sharding_catalog_manager.h"
#include "mongo/db/s/topology_time_ticker.h"
#include "mongo/db/update/update_oplog_entry_serialization.h"
#include "mongo/db/vector_clock_mutable.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/type_config_version.h"
#include "mongo/s/catalog/type_shard.h"
#include "mongo/s/cluster_identity_loader.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
ConfigServerOpObserver::ConfigServerOpObserver() = default;
ConfigServerOpObserver::~ConfigServerOpObserver() = default;
void ConfigServerOpObserver::onDelete(OperationContext* opCtx,
const NamespaceString& nss,
const UUID& uuid,
StmtId stmtId,
const OplogDeleteEntryArgs& args) {
if (nss == VersionType::ConfigNS) {
if (!repl::ReplicationCoordinator::get(opCtx)->getMemberState().rollback()) {
uasserted(40302, "cannot delete config.version document while in --configsvr mode");
} else {
// TODO (SERVER-34165): this is only used for rollback via refetch and can be removed
// with it.
// Throw out any cached information related to the cluster ID.
ShardingCatalogManager::get(opCtx)->discardCachedConfigDatabaseInitializationState();
ClusterIdentityLoader::get(opCtx)->discardCachedClusterId();
}
}
}
repl::OpTime ConfigServerOpObserver::onDropCollection(OperationContext* opCtx,
const NamespaceString& collectionName,
const UUID& uuid,
std::uint64_t numRecords,
const CollectionDropType dropType) {
if (collectionName == VersionType::ConfigNS) {
if (!repl::ReplicationCoordinator::get(opCtx)->getMemberState().rollback()) {
uasserted(40303, "cannot drop config.version document while in --configsvr mode");
} else {
// TODO (SERVER-34165): this is only used for rollback via refetch and can be removed
// with it.
// Throw out any cached information related to the cluster ID.
ShardingCatalogManager::get(opCtx)->discardCachedConfigDatabaseInitializationState();
ClusterIdentityLoader::get(opCtx)->discardCachedClusterId();
}
}
return {};
}
void ConfigServerOpObserver::_onReplicationRollback(OperationContext* opCtx,
const RollbackObserverInfo& rbInfo) {
if (rbInfo.configServerConfigVersionRolledBack) {
// Throw out any cached information related to the cluster ID.
ShardingCatalogManager::get(opCtx)->discardCachedConfigDatabaseInitializationState();
ClusterIdentityLoader::get(opCtx)->discardCachedClusterId();
}
if (rbInfo.rollbackNamespaces.find(NamespaceString::kConfigsvrShardsNamespace) !=
rbInfo.rollbackNamespaces.end()) {
// If some entries were rollbacked from config.shards we might need to discard some tick
// points from the TopologyTimeTicker
const auto lastApplied = repl::ReplicationCoordinator::get(opCtx)->getMyLastAppliedOpTime();
TopologyTimeTicker::get(opCtx).onReplicationRollback(lastApplied);
}
}
void ConfigServerOpObserver::onInserts(OperationContext* opCtx,
const NamespaceString& nss,
const UUID& uuid,
std::vector<InsertStatement>::const_iterator begin,
std::vector<InsertStatement>::const_iterator end,
bool fromMigrate) {
if (nss != NamespaceString::kConfigsvrShardsNamespace) {
return;
}
if (!topology_time_ticker_utils::inRecoveryMode(opCtx)) {
boost::optional<Timestamp> maxTopologyTime;
for (auto it = begin; it != end; it++) {
Timestamp newTopologyTime = it->doc[ShardType::topologyTime.name()].timestamp();
if (newTopologyTime != Timestamp()) {
if (!maxTopologyTime || newTopologyTime > *maxTopologyTime) {
maxTopologyTime = newTopologyTime;
}
}
}
if (maxTopologyTime) {
opCtx->recoveryUnit()->onCommit(
[opCtx, maxTopologyTime](boost::optional<Timestamp> commitTime) mutable {
invariant(commitTime);
TopologyTimeTicker::get(opCtx).onNewLocallyCommittedTopologyTimeAvailable(
*commitTime, *maxTopologyTime);
});
}
}
}
void ConfigServerOpObserver::onUpdate(OperationContext* opCtx, const OplogUpdateEntryArgs& args) {
if (args.nss != NamespaceString::kConfigsvrShardsNamespace) {
return;
}
const auto& updateDoc = args.updateArgs->update;
if (update_oplog_entry::extractUpdateType(updateDoc) ==
update_oplog_entry::UpdateType::kReplacement) {
return;
}
auto topologyTimeValue =
update_oplog_entry::extractNewValueForField(updateDoc, ShardType::topologyTime());
if (!topologyTimeValue.ok()) {
return;
}
auto topologyTime = topologyTimeValue.timestamp();
if (topologyTime == Timestamp()) {
return;
}
// Updates to config.shards are always done inside a transaction. This implies that the callback
// from onCommit can be called in a different thread. Since the TopologyTimeTicker is associated
// to the mongod instance and not to the OperationContext, we can safely obtain a reference at
// this point and passed it to the onCommit callback.
auto& topologyTicker = TopologyTimeTicker::get(opCtx);
opCtx->recoveryUnit()->onCommit(
[&topologyTicker, topologyTime](boost::optional<Timestamp> commitTime) mutable {
invariant(commitTime);
topologyTicker.onNewLocallyCommittedTopologyTimeAvailable(*commitTime, topologyTime);
});
}
void ConfigServerOpObserver::onMajorityCommitPointUpdate(ServiceContext* service,
const repl::OpTime& newCommitPoint) {
Timestamp newCommitPointTime = newCommitPoint.getTimestamp();
// TopologyTime must always be <= ConfigTime, so ticking them separately is fine as long as
// ConfigTime is done first.
VectorClockMutable::get(service)->tickConfigTimeTo(LogicalTime(newCommitPointTime));
// Letting the TopologyTimeTicker know that the majority commit point was advanced
TopologyTimeTicker::get(service).onMajorityCommitPointUpdate(service, newCommitPoint);
}
} // namespace mongo
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