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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.
*/
#pragma once
#include "mongo/db/persistent_task_store.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/s/collection_metadata.h"
#include "mongo/db/s/migration_coordinator_document_gen.h"
#include "mongo/db/s/range_deletion_task_gen.h"
#include "mongo/executor/thread_pool_task_executor.h"
#include "mongo/s/catalog/type_chunk.h"
namespace mongo {
class BSONObj;
class NamespaceString;
class ShardId;
namespace migrationutil {
constexpr auto kRangeDeletionThreadName = "range-deleter"_sd;
/**
* Creates a report document with the provided parameters:
*
* {
* source: "shard0000"
* destination: "shard0001"
* isDonorShard: true or false
* chunk: {"min": <MinKey>, "max": <MaxKey>}
* collection: "dbName.collName"
* }
*
*/
BSONObj makeMigrationStatusDocument(const NamespaceString& nss,
const ShardId& fromShard,
const ShardId& toShard,
const bool& isDonorShard,
const BSONObj& min,
const BSONObj& max);
/**
* Returns a chunk range with extended or truncated boundaries to match the number of fields in the
* given metadata's shard key pattern.
*/
ChunkRange extendOrTruncateBoundsForMetadata(const CollectionMetadata& metadata,
const ChunkRange& range);
/**
* Returns an executor to be used to run commands related to submitting tasks to the range deleter.
* The executor is initialized on the first call to this function. Uses a shared_ptr
* because a shared_ptr is required to work with ExecutorFutures.
*/
std::shared_ptr<executor::ThreadPoolTaskExecutor> getMigrationUtilExecutor(
ServiceContext* serviceContext);
/**
* Creates a query object that can used to find overlapping ranges in the pending range deletions
* collection.
*/
Query overlappingRangeQuery(const ChunkRange& range, const UUID& uuid);
/**
* Checks the pending range deletions collection to see if there are any pending ranges that
* conflict with the passed in range.
*/
size_t checkForConflictingDeletions(OperationContext* opCtx,
const ChunkRange& range,
const UUID& uuid);
/**
* Asynchronously attempts to submit the RangeDeletionTask for processing.
*
* Note that if the current filtering metadata's UUID does not match the task's UUID, the filtering
* metadata will be refreshed once. If the UUID's still don't match, the task will be deleted from
* disk. If the UUID's do match, the range will be submitted for deletion.
*
* If the range is submitted for deletion, the returned future is set when the range deletion
* completes. If the range is not submitted for deletion, the returned future is set with an error
* explaining why.
*/
ExecutorFuture<void> submitRangeDeletionTask(OperationContext* oppCtx,
const RangeDeletionTask& deletionTask);
/**
* Queries the rangeDeletions collection for ranges that are ready to be deleted and submits them to
* the range deleter.
*/
void submitPendingDeletions(OperationContext* opCtx);
/**
* Asynchronously calls submitPendingDeletions using the fixed executor pool.
*/
void resubmitRangeDeletionsOnStepUp(ServiceContext* serviceContext);
void dropRangeDeletionsCollection(OperationContext* opCtx);
/**
* Find and submit all orphan ranges for deletion.
*/
void submitOrphanRangesForCleanup(OperationContext* opCtx);
/**
* Writes the migration coordinator document to config.migrationCoordinators and waits for majority
* write concern.
*/
void persistMigrationCoordinatorLocally(OperationContext* opCtx,
const MigrationCoordinatorDocument& migrationDoc);
/**
* Writes the range deletion task document to config.rangeDeletions and waits for majority write
* concern.
*/
void persistRangeDeletionTaskLocally(OperationContext* opCtx,
const RangeDeletionTask& deletionTask,
const WriteConcernOptions& writeConcern);
/**
* Updates the migration coordinator document to set the decision field to "committed" and waits for
* majority writeConcern.
*/
void persistCommitDecision(OperationContext* opCtx,
const MigrationCoordinatorDocument& migrationDoc);
/**
* Updates the migration coordinator document to set the decision field to "aborted" and waits for
* majority writeConcern.
*/
void persistAbortDecision(OperationContext* opCtx,
const MigrationCoordinatorDocument& migrationDoc);
/**
* Deletes the range deletion task document with the specified id from config.rangeDeletions and
* waits for majority write concern.
*/
void deleteRangeDeletionTaskLocally(
OperationContext* opCtx,
const UUID& deletionTaskId,
const WriteConcernOptions& writeConcern = WriteConcerns::kMajorityWriteConcern);
/**
* Deletes the range deletion task document with the specified id from config.rangeDeletions on the
* specified shard and waits for majority write concern.
*/
void deleteRangeDeletionTaskOnRecipient(OperationContext* opCtx,
const ShardId& recipientId,
const UUID& migrationId);
/**
* Advances the optime for the current transaction by performing a write operation as a retryable
* write. This is to prevent a write of the deletion task once the decision has been recorded.
*/
void advanceTransactionOnRecipient(OperationContext* opCtx,
const ShardId& recipientId,
const LogicalSessionId& lsid,
TxnNumber txnNumber);
/**
* Removes the 'pending' flag from the range deletion task document with the specified id from
* config.rangeDeletions and waits for majority write concern. This marks the range as ready for
* deletion.
*/
void markAsReadyRangeDeletionTaskLocally(OperationContext* opCtx, const UUID& migrationId);
/**
* Removes the 'pending' flag from the range deletion task document with the specified id from
* config.rangeDeletions on the specified shard and waits for majority write concern. This marks the
* range as ready for deletion.
*/
void markAsReadyRangeDeletionTaskOnRecipient(OperationContext* opCtx,
const ShardId& recipientId,
const UUID& migrationId);
/**
* Deletes the migration coordinator document with the specified id from
* config.migrationCoordinators without waiting for majority writeConcern.
*/
void deleteMigrationCoordinatorDocumentLocally(OperationContext* opCtx, const UUID& migrationId);
/**
* Sends _configsvrEnsureChunkVersionIsGreaterThan for the range and preMigrationChunkVersion until
* hearing success or the node steps down or shuts down.
*/
void ensureChunkVersionIsGreaterThan(OperationContext* opCtx,
const ChunkRange& range,
const ChunkVersion& preMigrationChunkVersion);
/**
* Forces a filtering metadata refresh of the namespace until the refresh succeeds or the node
* steps down or shuts down.
*/
void refreshFilteringMetadataUntilSuccess(OperationContext* opCtx, const NamespaceString& nss);
/**
* Submits an asynchronous task to scan config.migrationCoordinators and drive each unfinished
* migration coordination to completion.
*/
void resumeMigrationCoordinationsOnStepUp(OperationContext* opCtx);
/**
* Drive each unfished migration coordination in the given namespace to completion.
* Assumes the caller to have entered CollectionCriticalSection.
*/
void recoverMigrationCoordinations(OperationContext* opCtx, NamespaceString nss);
} // namespace migrationutil
} // namespace mongo
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