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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/db/s/collection_range_deleter.h"
#include <algorithm>
#include "mongo/db/catalog/collection.h"
#include "mongo/db/client.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/keypattern.h"
#include "mongo/db/query/internal_plans.h"
#include "mongo/db/query/query_knobs.h"
#include "mongo/db/query/query_planner.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/write_concern.h"
#include "mongo/executor/task_executor.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
class ChunkRange;
class OldClientWriteContext;
using CallbackArgs = executor::TaskExecutor::CallbackArgs;
using logger::LogComponent;
namespace {
const WriteConcernOptions kMajorityWriteConcern(WriteConcernOptions::kMajority,
WriteConcernOptions::SyncMode::UNSET,
Seconds(60));
} // unnamed namespace
CollectionRangeDeleter::CollectionRangeDeleter(NamespaceString nss) : _nss(std::move(nss)) {}
void CollectionRangeDeleter::run() {
Client::initThread(getThreadName().c_str());
ON_BLOCK_EXIT([&] { Client::destroy(); });
auto txn = cc().makeOperationContext().get();
const int maxToDelete = std::max(int(internalQueryExecYieldIterations.load()), 1);
bool hasNextRangeToClean = cleanupNextRange(txn, maxToDelete);
// If there are more ranges to run, we add <this> back onto the task executor to run again.
if (hasNextRangeToClean) {
auto executor = ShardingState::get(txn)->getRangeDeleterTaskExecutor();
executor->scheduleWork([this](const CallbackArgs& cbArgs) { run(); });
} else {
delete this;
}
}
bool CollectionRangeDeleter::cleanupNextRange(OperationContext* txn, int maxToDelete) {
{
AutoGetCollection autoColl(txn, _nss, MODE_IX);
auto* collection = autoColl.getCollection();
if (!collection) {
return false;
}
auto* collectionShardingState = CollectionShardingState::get(txn, _nss);
dassert(collectionShardingState != nullptr); // every collection gets one
auto& metadataManager = collectionShardingState->_metadataManager;
if (!_rangeInProgress && !metadataManager.hasRangesToClean()) {
// Nothing left to do
return false;
}
if (!_rangeInProgress || !metadataManager.isInRangesToClean(_rangeInProgress.get())) {
// No valid chunk in progress, get a new one
if (!metadataManager.hasRangesToClean()) {
return false;
}
_rangeInProgress = metadataManager.getNextRangeToClean();
}
auto scopedCollectionMetadata = collectionShardingState->getMetadata();
int numDocumentsDeleted =
_doDeletion(txn, collection, scopedCollectionMetadata->getKeyPattern(), maxToDelete);
if (numDocumentsDeleted <= 0) {
metadataManager.removeRangeToClean(_rangeInProgress.get());
_rangeInProgress = boost::none;
return metadataManager.hasRangesToClean();
}
}
// wait for replication
WriteConcernResult wcResult;
auto currentClientOpTime = repl::ReplClientInfo::forClient(txn->getClient()).getLastOp();
Status status = waitForWriteConcern(txn, currentClientOpTime, kMajorityWriteConcern, &wcResult);
if (!status.isOK()) {
warning() << "Error when waiting for write concern after removing chunks in " << _nss
<< " : " << status.reason();
}
return true;
}
int CollectionRangeDeleter::_doDeletion(OperationContext* txn,
Collection* collection,
const BSONObj& keyPattern,
int maxToDelete) {
invariant(_rangeInProgress);
invariant(collection);
// The IndexChunk has a keyPattern that may apply to more than one index - we need to
// select the index and get the full index keyPattern here.
const IndexDescriptor* idx =
collection->getIndexCatalog()->findShardKeyPrefixedIndex(txn, keyPattern, false);
if (idx == NULL) {
warning() << "Unable to find shard key index for " << keyPattern.toString() << " in "
<< _nss;
return -1;
}
KeyPattern indexKeyPattern(idx->keyPattern().getOwned());
// Extend bounds to match the index we found
const BSONObj& min =
Helpers::toKeyFormat(indexKeyPattern.extendRangeBound(_rangeInProgress->getMin(), false));
const BSONObj& max =
Helpers::toKeyFormat(indexKeyPattern.extendRangeBound(_rangeInProgress->getMax(), false));
LOG(1) << "begin removal of " << min << " to " << max << " in " << _nss;
auto indexName = idx->indexName();
IndexDescriptor* desc = collection->getIndexCatalog()->findIndexByName(txn, indexName);
if (!desc) {
warning() << "shard key index with name " << indexName << " on '" << _nss
<< "' was dropped";
return -1;
}
int numDeleted = 0;
do {
auto exec = InternalPlanner::indexScan(txn, collection, desc, min, max,
BoundInclusion::kIncludeStartKeyOnly,
PlanExecutor::YIELD_MANUAL,
InternalPlanner::FORWARD,
InternalPlanner::IXSCAN_FETCH);
RecordId rloc; BSONObj obj;
PlanExecutor::ExecState state = exec->getNext(&obj, &rloc);
if (state == PlanExecutor::IS_EOF) {
break;
}
if (state == PlanExecutor::FAILURE || state == PlanExecutor::DEAD) {
warning(LogComponent::kSharding)
<< PlanExecutor::statestr(state) << " - cursor error while trying to delete "
<< min << " to " << max << " in " << _nss << ": "
<< WorkingSetCommon::toStatusString(obj) << ", stats: "
<< Explain::getWinningPlanStats(exec.get());
break;
}
invariant(PlanExecutor::ADVANCED == state);
WriteUnitOfWork wuow(txn);
if (!repl::getGlobalReplicationCoordinator()->canAcceptWritesFor(_nss)) {
warning() << "stepped down from primary while deleting chunk; orphaning data in "
<< _nss << " in range [" << min << ", " << max << ")";
break;
}
OpDebug* const nullOpDebug = nullptr;
collection->deleteDocument(txn, rloc, nullOpDebug, true);
wuow.commit();
} while (++numDeleted < maxToDelete);
return numDeleted;
}
} // namespace mongo
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