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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.
*/
#include "mongo/db/s/drop_collection_coordinator.h"
#include "mongo/db/catalog/collection_uuid_mismatch.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/s/sharding_ddl_util.h"
#include "mongo/db/s/sharding_logging.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/sharded_ddl_commands_gen.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
DropReply DropCollectionCoordinator::dropCollectionLocally(OperationContext* opCtx,
const NamespaceString& nss) {
{
// Clear CollectionShardingRuntime entry
Lock::DBLock dbLock(opCtx, nss.dbName(), MODE_IX);
Lock::CollectionLock collLock(opCtx, nss, MODE_IX);
auto* csr = CollectionShardingRuntime::get(opCtx, nss);
csr->clearFilteringMetadataForDroppedCollection(opCtx);
}
DropReply result;
uassertStatusOK(dropCollection(
opCtx, nss, &result, DropCollectionSystemCollectionMode::kDisallowSystemCollectionDrops));
// Force the refresh of the catalog cache to purge outdated information
const auto catalog = Grid::get(opCtx)->catalogCache();
uassertStatusOK(catalog->getCollectionRoutingInfoWithRefresh(opCtx, nss));
CatalogCacheLoader::get(opCtx).waitForCollectionFlush(opCtx, nss);
repl::ReplClientInfo::forClient(opCtx->getClient()).setLastOpToSystemLastOpTime(opCtx);
return result;
}
ExecutorFuture<void> DropCollectionCoordinator::_runImpl(
std::shared_ptr<executor::ScopedTaskExecutor> executor,
const CancellationToken& token) noexcept {
return ExecutorFuture<void>(**executor)
.then(_executePhase(
Phase::kFreezeCollection,
[this, anchor = shared_from_this()] {
auto opCtxHolder = cc().makeOperationContext();
auto* opCtx = opCtxHolder.get();
getForwardableOpMetadata().setOn(opCtx);
try {
auto coll = Grid::get(opCtx)->catalogClient()->getCollection(opCtx, nss());
_doc.setCollInfo(std::move(coll));
} catch (const ExceptionFor<ErrorCodes::NamespaceNotFound>&) {
// The collection is not sharded or doesn't exist.
_doc.setCollInfo(boost::none);
}
{
AutoGetCollection coll{
opCtx, nss(), MODE_IS, AutoGetCollectionViewMode::kViewsPermitted};
checkCollectionUUIDMismatch(opCtx, nss(), *coll, _doc.getCollectionUUID());
}
BSONObjBuilder logChangeDetail;
if (_doc.getCollInfo()) {
logChangeDetail.append("collectionUUID",
_doc.getCollInfo()->getUuid().toBSON());
}
ShardingLogging::get(opCtx)->logChange(
opCtx, "dropCollection.start", nss().ns(), logChangeDetail.obj());
// Persist the collection info before sticking to using it's uuid. This ensures this
// node is still the RS primary, so it was also the primary at the moment we read
// the collection metadata.
_updateStateDocument(opCtx, StateDoc(_doc));
if (_doc.getCollInfo()) {
sharding_ddl_util::stopMigrations(opCtx, nss(), _doc.getCollInfo()->getUuid());
}
}))
.then(_executePhase(
Phase::kDropCollection,
[this, executor = executor, anchor = shared_from_this()] {
auto opCtxHolder = cc().makeOperationContext();
auto* opCtx = opCtxHolder.get();
getForwardableOpMetadata().setOn(opCtx);
if (!_firstExecution) {
// Perform a noop write on the participants in order to advance the txnNumber
// for this coordinator's lsid so that requests with older txnNumbers can no
// longer execute.
_updateSession(opCtx);
_performNoopRetryableWriteOnAllShardsAndConfigsvr(
opCtx, getCurrentSession(), **executor);
}
const auto collIsSharded = bool(_doc.getCollInfo());
LOGV2_DEBUG(5390504,
2,
"Dropping collection",
"namespace"_attr = nss(),
"sharded"_attr = collIsSharded);
if (collIsSharded) {
invariant(_doc.getCollInfo());
const auto& coll = _doc.getCollInfo().value();
sharding_ddl_util::removeCollAndChunksMetadataFromConfig(
opCtx, coll, ShardingCatalogClient::kMajorityWriteConcern);
}
// Remove tags even if the collection is not sharded or didn't exist
_updateSession(opCtx);
sharding_ddl_util::removeTagsMetadataFromConfig(opCtx, nss(), getCurrentSession());
// get a Lsid and an incremented txnNumber. Ensures we are the primary
_updateSession(opCtx);
const auto primaryShardId = ShardingState::get(opCtx)->shardId();
// We need to send the drop to all the shards because both movePrimary and
// moveChunk leave garbage behind for sharded collections.
auto participants = Grid::get(opCtx)->shardRegistry()->getAllShardIds(opCtx);
// Remove primary shard from participants
participants.erase(
std::remove(participants.begin(), participants.end(), primaryShardId),
participants.end());
sharding_ddl_util::sendDropCollectionParticipantCommandToShards(
opCtx, nss(), participants, **executor, getCurrentSession());
// The sharded collection must be dropped on the primary shard after it has been
// dropped on all of the other shards to ensure it can only be re-created as
// unsharded with a higher optime than all of the drops.
sharding_ddl_util::sendDropCollectionParticipantCommandToShards(
opCtx, nss(), {primaryShardId}, **executor, getCurrentSession());
ShardingLogging::get(opCtx)->logChange(opCtx, "dropCollection", nss().ns());
LOGV2(5390503, "Collection dropped", "namespace"_attr = nss());
}))
.onError([this, anchor = shared_from_this()](const Status& status) {
if (!status.isA<ErrorCategory::NotPrimaryError>() &&
!status.isA<ErrorCategory::ShutdownError>()) {
LOGV2_ERROR(5280901,
"Error running drop collection",
"namespace"_attr = nss(),
"error"_attr = redact(status));
}
return status;
});
}
} // namespace mongo
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