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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/db/s/op_observer_sharding_impl.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/db/s/collection_sharding_runtime.h"
#include "mongo/db/s/database_sharding_state.h"
#include "mongo/db/s/migration_chunk_cloner_source.h"
#include "mongo/db/s/migration_source_manager.h"
#include "mongo/db/s/sharding_write_router.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace {
const auto getIsMigrating = OperationContext::declareDecoration<bool>();
/**
* Write operations do shard version checking, but if an update operation runs as part of a
* 'readConcern:snapshot' transaction, the router could have used the metadata at the snapshot
* time and yet set the latest shard version on the request. This is why the write can get routed
* to a shard which no longer owns the chunk being written to. In such cases, throw a
* MigrationConflict exception to indicate that the transaction needs to be rolled-back and
* restarted.
*/
void assertIntersectingChunkHasNotMoved(OperationContext* opCtx,
const CollectionMetadata& metadata,
const BSONObj& shardKey,
const LogicalTime& atClusterTime) {
// We can assume the simple collation because shard keys do not support non-simple collations.
auto cmAtTimeOfWrite =
ChunkManager::makeAtTime(*metadata.getChunkManager(), atClusterTime.asTimestamp());
auto chunk = cmAtTimeOfWrite.findIntersectingChunkWithSimpleCollation(shardKey);
// Throws if the chunk has moved since the timestamp of the running transaction's atClusterTime
// read concern parameter.
chunk.throwIfMoved();
}
void assertNoMovePrimaryInProgress(OperationContext* opCtx, const NamespaceString& nss) {
if (!nss.isNormalCollection() && nss.coll() != "system.views" &&
!nss.isTimeseriesBucketsCollection()) {
return;
}
// TODO SERVER-58222: evaluate whether this is safe or whether acquiring the lock can block.
AllowLockAcquisitionOnTimestampedUnitOfWork allowLockAcquisition(opCtx->lockState());
Lock::DBLock dblock(opCtx, nss.dbName(), MODE_IS);
const auto scopedDss =
DatabaseShardingState::assertDbLockedAndAcquireShared(opCtx, nss.dbName());
if (scopedDss->isMovePrimaryInProgress()) {
LOGV2(4908600, "assertNoMovePrimaryInProgress", logAttrs(nss));
uasserted(ErrorCodes::MovePrimaryInProgress,
"movePrimary is in progress for namespace " + nss.toStringForErrorMsg());
}
}
} // namespace
OpObserverShardingImpl::OpObserverShardingImpl(std::unique_ptr<OplogWriter> oplogWriter)
: OpObserverImpl(std::move(oplogWriter)) {}
void OpObserverShardingImpl::shardObserveAboutToDelete(OperationContext* opCtx,
NamespaceString const& nss,
BSONObj const& docToDelete) {
getIsMigrating(opCtx) = MigrationSourceManager::isMigrating(opCtx, nss, docToDelete);
}
void OpObserverShardingImpl::shardObserveInsertsOp(
OperationContext* opCtx,
const NamespaceString& nss,
std::vector<InsertStatement>::const_iterator first,
std::vector<InsertStatement>::const_iterator last,
const std::vector<repl::OpTime>& opTimeList,
const ShardingWriteRouter& shardingWriteRouter,
const bool fromMigrate,
const bool inMultiDocumentTransaction) {
if (nss == NamespaceString::kSessionTransactionsTableNamespace || fromMigrate)
return;
auto* const css = shardingWriteRouter.getCss();
css->checkShardVersionOrThrow(opCtx);
DatabaseShardingState::assertMatchingDbVersion(opCtx, nss.dbName());
auto* const csr = checked_cast<CollectionShardingRuntime*>(css);
auto metadata = csr->getCurrentMetadataIfKnown();
if (!metadata || !metadata->isSharded()) {
assertNoMovePrimaryInProgress(opCtx, nss);
return;
}
int index = 0;
for (auto it = first; it != last; it++, index++) {
auto opTime = opTimeList.empty() ? repl::OpTime() : opTimeList[index];
if (inMultiDocumentTransaction) {
const auto atClusterTime = repl::ReadConcernArgs::get(opCtx).getArgsAtClusterTime();
if (atClusterTime) {
const auto shardKey =
metadata->getShardKeyPattern().extractShardKeyFromDocThrows(it->doc);
assertIntersectingChunkHasNotMoved(opCtx, *metadata, shardKey, *atClusterTime);
}
return;
}
auto cloner = MigrationSourceManager::getCurrentCloner(*csr);
if (cloner) {
cloner->onInsertOp(opCtx, it->doc, opTime);
}
}
}
void OpObserverShardingImpl::shardObserveUpdateOp(OperationContext* opCtx,
const NamespaceString& nss,
boost::optional<BSONObj> preImageDoc,
const BSONObj& postImageDoc,
const repl::OpTime& opTime,
const ShardingWriteRouter& shardingWriteRouter,
const bool inMultiDocumentTransaction) {
auto* const css = shardingWriteRouter.getCss();
css->checkShardVersionOrThrow(opCtx);
DatabaseShardingState::assertMatchingDbVersion(opCtx, nss.dbName());
auto* const csr = checked_cast<CollectionShardingRuntime*>(css);
auto metadata = csr->getCurrentMetadataIfKnown();
if (!metadata || !metadata->isSharded()) {
assertNoMovePrimaryInProgress(opCtx, nss);
return;
}
if (inMultiDocumentTransaction) {
const auto atClusterTime = repl::ReadConcernArgs::get(opCtx).getArgsAtClusterTime();
if (atClusterTime) {
const auto shardKey =
metadata->getShardKeyPattern().extractShardKeyFromDocThrows(postImageDoc);
assertIntersectingChunkHasNotMoved(opCtx, *metadata, shardKey, *atClusterTime);
}
return;
}
auto cloner = MigrationSourceManager::getCurrentCloner(*csr);
if (cloner) {
cloner->onUpdateOp(opCtx, preImageDoc, postImageDoc, opTime);
}
}
void OpObserverShardingImpl::shardObserveDeleteOp(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& documentKey,
const repl::OpTime& opTime,
const ShardingWriteRouter& shardingWriteRouter,
const bool inMultiDocumentTransaction) {
auto* const css = shardingWriteRouter.getCss();
css->checkShardVersionOrThrow(opCtx);
DatabaseShardingState::assertMatchingDbVersion(opCtx, nss.dbName());
auto* const csr = checked_cast<CollectionShardingRuntime*>(css);
auto metadata = csr->getCurrentMetadataIfKnown();
if (!metadata || !metadata->isSharded()) {
assertNoMovePrimaryInProgress(opCtx, nss);
return;
}
if (inMultiDocumentTransaction) {
const auto atClusterTime = repl::ReadConcernArgs::get(opCtx).getArgsAtClusterTime();
if (atClusterTime) {
const auto shardKey =
metadata->getShardKeyPattern().extractShardKeyFromDocumentKeyThrows(documentKey);
assertIntersectingChunkHasNotMoved(opCtx, *metadata, shardKey, *atClusterTime);
}
return;
}
auto cloner = MigrationSourceManager::getCurrentCloner(*csr);
if (cloner && getIsMigrating(opCtx)) {
cloner->onDeleteOp(opCtx, documentKey, opTime);
}
}
void OpObserverShardingImpl::shardObserveTransactionPrepareOrUnpreparedCommit(
OperationContext* opCtx,
const std::vector<repl::ReplOperation>& stmts,
const repl::OpTime& prepareOrCommitOptime) {
opCtx->recoveryUnit()->registerChange(
std::make_unique<LogTransactionOperationsForShardingHandler>(
*opCtx->getLogicalSessionId(), stmts, prepareOrCommitOptime));
}
void OpObserverShardingImpl::shardObserveNonPrimaryTransactionPrepare(
OperationContext* opCtx,
const std::vector<repl::OplogEntry>& stmts,
const repl::OpTime& prepareOrCommitOptime) {
opCtx->recoveryUnit()->registerChange(
std::make_unique<LogTransactionOperationsForShardingHandler>(
*opCtx->getLogicalSessionId(), stmts, prepareOrCommitOptime));
}
} // namespace mongo
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