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/**
* Copyright (C) 2022-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::kWrite
#include "mongo/platform/basic.h"
#include "mongo/db/exec/batched_delete_stage.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/exec/scoped_timer.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/db/exec/write_stage_common.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/service_context.h"
#include "mongo/logv2/log.h"
#include "mongo/s/pm2423_feature_flags_gen.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
BatchedDeleteStage::BatchedDeleteStage(ExpressionContext* expCtx,
std::unique_ptr<DeleteStageParams> params,
std::unique_ptr<BatchedDeleteStageBatchParams> batchParams,
WorkingSet* ws,
const CollectionPtr& collection,
PlanStage* child)
: DeleteStage::DeleteStage(
kStageType.rawData(), expCtx, std::move(params), ws, collection, child),
_batchParams(std::move(batchParams)) {
uassert(6303800,
"batched deletions only support multi-document deletions (multi: true)",
_params->isMulti);
tassert(6303801,
"batched deletions do not support the 'fromMigrate' parameter",
!_params->fromMigrate);
tassert(6303802,
"batched deletions do not support the 'returnDelete' parameter",
!_params->returnDeleted);
tassert(
6303803, "batched deletions do not support the 'sort' parameter", _params->sort.isEmpty());
tassert(6303804,
"batched deletions do not support the 'removeSaver' parameter",
_params->sort.isEmpty());
tassert(6303805,
"batched deletions do not support the 'numStatsForDoc' parameter",
!_params->numStatsForDoc);
tassert(6303806,
"batch size cannot be unbounded; you must specify at least one of the following batch "
"parameters: "
"'targetBatchBytes', 'targetBatchDocs', 'targetBatchTimeMS'",
_batchParams->targetBatchBytes || _batchParams->targetBatchDocs ||
_batchParams->targetBatchTimeMS != Milliseconds(0));
}
BatchedDeleteStage::~BatchedDeleteStage() {}
PlanStage::StageState BatchedDeleteStage::_deleteBatch(WorkingSetID* out) {
try {
child()->saveState();
} catch (const WriteConflictException&) {
std::terminate();
}
// TODO (SERVER-63047): use a single write timestamp by grouping oplog entries.
opCtx()->recoveryUnit()->ignoreAllMultiTimestampConstraints();
unsigned int docsDeleted = 0;
try {
WriteUnitOfWork wuow(opCtx());
while (!_ridBuffer.empty()) {
const auto rid = _ridBuffer.front();
_ridBuffer.pop_front();
// TODO (SERVER-63863): skip the record if it does not exist any longer.
collection()->deleteDocument(opCtx(),
_params->stmtId,
rid,
_params->opDebug,
_params->fromMigrate,
false,
_params->returnDeleted ? Collection::StoreDeletedDoc::On
: Collection::StoreDeletedDoc::Off);
docsDeleted++;
}
wuow.commit();
} catch (const WriteConflictException&) {
// TODO (SERVER-63863): retriability on write conflict exception.
}
_specificStats.docsDeleted += docsDeleted;
try {
child()->restoreState(&collection());
} catch (const WriteConflictException&) {
// Note we don't need to retry anything in this case since the delete already was committed.
*out = WorkingSet::INVALID_ID;
return NEED_YIELD;
}
return NEED_TIME;
}
PlanStage::StageState BatchedDeleteStage::doWork(WorkingSetID* out) {
// TODO (SERVER-63863): handle retries due to a previous write conflict exception.
WorkingSetID id;
auto status = child()->work(&id);
switch (status) {
case PlanStage::ADVANCED:
break;
case PlanStage::NEED_TIME:
return status;
case PlanStage::NEED_YIELD:
*out = id;
return status;
case PlanStage::IS_EOF:
if (!_ridBuffer.empty()) {
// Drain the outstanding deletions.
auto ret = _deleteBatch(out);
if (ret != NEED_TIME) {
return ret;
}
}
return status;
default:
MONGO_UNREACHABLE;
}
// We advanced, or are retrying, and id is set to the WSM to work on.
WorkingSetMember* member = _ws->get(id);
// We want to free this member when we return, unless we need to retry deleting it.
ScopeGuard memberFreer([&] { _ws->free(id); });
invariant(member->hasRecordId());
RecordId recordId = member->recordId;
// Deletes can't have projections. This means that covering analysis will always add
// a fetch. We should always get fetched data, and never just key data.
invariant(member->hasObj());
// Ensure that the BSONObj underlying the WSM is owned because saveState() is
// allowed to free the memory the BSONObj points to. The BSONObj will be needed
// later when it is passed to Collection::deleteDocument(). Note that the call to
// makeObjOwnedIfNeeded() will leave the WSM in the RID_AND_OBJ state in case we need to retry
// deleting it.
member->makeObjOwnedIfNeeded();
// Do the write, unless this is an explain.
if (!_params->isExplain) {
_ridBuffer.emplace_back(recordId);
if (_batchParams->targetBatchDocs && _ridBuffer.size() >= _batchParams->targetBatchDocs) {
return _deleteBatch(out);
}
}
return PlanStage::NEED_TIME;
}
} // namespace mongo
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