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/**
* Copyright (C) 2019-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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/db/s/migration_coordinator.h"
#include "mongo/db/s/migration_util.h"
#include "mongo/db/s/range_deletion_task_gen.h"
#include "mongo/util/fail_point.h"
#include "mongo/util/log.h"
namespace mongo {
MONGO_FAIL_POINT_DEFINE(disableWritingPendingRangeDeletionEntries);
namespace migrationutil {
MigrationCoordinator::MigrationCoordinator(UUID migrationId,
ShardId donorShard,
ShardId recipientShard,
NamespaceString collectionNamespace,
UUID collectionUuid,
ChunkRange range,
ChunkVersion preMigrationChunkVersion)
: _migrationInfo(migrationId,
std::move(collectionNamespace),
collectionUuid,
std::move(donorShard),
std::move(recipientShard),
std::move(range),
std::move(preMigrationChunkVersion)) {}
MigrationCoordinator::~MigrationCoordinator() = default;
void MigrationCoordinator::startMigration(OperationContext* opCtx, bool waitForDelete) {
LOG(0) << _logPrefix() << "Persisting migration coordinator doc";
migrationutil::persistMigrationCoordinatorLocally(opCtx, _migrationInfo);
if (!disableWritingPendingRangeDeletionEntries.shouldFail()) {
LOG(0) << _logPrefix() << "Persisting range deletion task on donor";
RangeDeletionTask donorDeletionTask(_migrationInfo.getId(),
_migrationInfo.getNss(),
_migrationInfo.getCollectionUuid(),
_migrationInfo.getDonorShardId(),
_migrationInfo.getRange(),
waitForDelete ? CleanWhenEnum::kNow
: CleanWhenEnum::kDelayed);
donorDeletionTask.setPending(true);
migrationutil::persistRangeDeletionTaskLocally(opCtx, donorDeletionTask);
}
}
void MigrationCoordinator::setMigrationDecision(Decision decision) {
LOG(0) << _logPrefix() << "MigrationCoordinator setting migration decision to "
<< (decision == Decision::kCommitted ? "committed" : "aborted");
_decision = decision;
}
void MigrationCoordinator::completeMigration(OperationContext* opCtx) {
if (!_decision) {
LOG(0) << _logPrefix()
<< "Migration completed without setting a decision. This node might have started "
"stepping down or shutting down after having initiated commit against the config "
"server but before having found out if the commit succeeded. The new primary of "
"this replica set will complete the migration coordination.";
return;
}
LOG(0) << _logPrefix() << "MigrationCoordinator delivering decision "
<< (_decision == Decision::kCommitted ? "committed" : "aborted")
<< " to self and to recipient";
switch (*_decision) {
case Decision::kAborted:
_abortMigrationOnDonorAndRecipient(opCtx);
break;
case Decision::kCommitted:
_commitMigrationOnDonorAndRecipient(opCtx);
break;
}
_forgetMigration(opCtx);
}
void MigrationCoordinator::_commitMigrationOnDonorAndRecipient(OperationContext* opCtx) {
LOG(0) << _logPrefix() << "Making commit decision durable";
migrationutil::persistCommitDecision(opCtx, _migrationInfo.getId());
LOG(0) << _logPrefix() << "Deleting range deletion task on recipient";
migrationutil::deleteRangeDeletionTaskOnRecipient(
opCtx, _migrationInfo.getRecipientShardId(), _migrationInfo.getId());
LOG(0) << _logPrefix() << "Marking range deletion task on donor as ready for processing";
migrationutil::markAsReadyRangeDeletionTaskLocally(opCtx, _migrationInfo.getId());
}
void MigrationCoordinator::_abortMigrationOnDonorAndRecipient(OperationContext* opCtx) {
LOG(0) << _logPrefix() << "Making abort decision durable";
migrationutil::persistAbortDecision(opCtx, _migrationInfo.getId());
LOG(0) << _logPrefix() << "Deleting range deletion task on donor";
migrationutil::deleteRangeDeletionTaskLocally(opCtx, _migrationInfo.getId());
LOG(0) << _logPrefix() << "Marking range deletion task on recipient as ready for processing";
migrationutil::markAsReadyRangeDeletionTaskOnRecipient(
opCtx, _migrationInfo.getRecipientShardId(), _migrationInfo.getId());
}
void MigrationCoordinator::_forgetMigration(OperationContext* opCtx) {
LOG(0) << _logPrefix() << "Deleting migration coordinator document";
migrationutil::deleteMigrationCoordinatorDocumentLocally(opCtx, _migrationInfo.getId());
}
std::string MigrationCoordinator::_logPrefix() const {
return str::stream() << "[migration-coordinator-" << _migrationInfo.getId() << "] ";
}
} // namespace migrationutil
} // namespace mongo
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