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/**
* Copyright (C) 2020-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 <list>
#include <memory>
#include "mongo/db/cancelable_operation_context.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/db/s/resharding/donor_oplog_id_gen.h"
#include "mongo/db/s/resharding/resharding_donor_oplog_iterator.h"
#include "mongo/db/s/resharding/resharding_metrics_new.h"
#include "mongo/db/s/resharding/resharding_oplog_application.h"
#include "mongo/db/s/resharding/resharding_oplog_applier_progress_gen.h"
#include "mongo/db/s/resharding/resharding_oplog_batch_applier.h"
#include "mongo/db/s/resharding/resharding_oplog_batch_preparer.h"
#include "mongo/db/s/resharding/resharding_oplog_session_application.h"
#include "mongo/executor/task_executor.h"
#include "mongo/s/chunk_manager.h"
#include "mongo/util/future.h"
namespace mongo {
class ReshardingMetrics;
class ServiceContext;
/**
* Applies oplog entries from a specific donor for resharding.
*
* @param sourceId combines the resharding run's UUID with the donor ShardId.
* @param allStashNss are the namespaces of the stash collections. There is one stash collection for
* each donor. This ReshardingOplogApplier will write documents as necessary to
* the stash collection at `myStashIdx` and may need to read and delete documents
* from any of the other stash collections.
* @param myStashIdx -- see above.
*
* This is not thread safe.
*/
class ReshardingOplogApplier {
public:
class Env {
public:
Env(ServiceContext* service, ReshardingMetrics* metrics, ReshardingMetricsNew* metricsNew)
: _service(service), _metrics(metrics), _metricsNew(metricsNew) {}
ServiceContext* service() const {
return _service;
}
ReshardingMetrics* metrics() const {
return _metrics;
}
ReshardingMetricsNew* metricsNew() const {
return _metricsNew;
}
private:
ServiceContext* _service;
ReshardingMetrics* _metrics;
ReshardingMetricsNew* _metricsNew;
};
ReshardingOplogApplier(std::unique_ptr<Env> env,
ReshardingSourceId sourceId,
NamespaceString outputNss,
std::vector<NamespaceString> allStashNss,
size_t myStashIdx,
ChunkManager sourceChunkMgr,
std::unique_ptr<ReshardingDonorOplogIteratorInterface> oplogIterator);
/**
* Schedules work to repeatedly apply batches of oplog entries from a donor shard.
*
* Returns a future that becomes ready when either:
* (a) all documents have been applied, or
* (b) the cancellation token was canceled due to a stepdown or abort.
*/
SemiFuture<void> run(std::shared_ptr<executor::TaskExecutor> executor,
std::shared_ptr<executor::TaskExecutor> cleanupExecutor,
CancellationToken cancelToken,
CancelableOperationContextFactory factory);
static boost::optional<ReshardingOplogApplierProgress> checkStoredProgress(
OperationContext* opCtx, const ReshardingSourceId& id);
static NamespaceString ensureStashCollectionExists(OperationContext* opCtx,
const UUID& existingUUID,
const ShardId& donorShardId,
const CollectionOptions& options);
private:
using OplogBatch = std::vector<repl::OplogEntry>;
/**
* Setup the worker threads to apply the ops in the current buffer in parallel. Waits for all
* worker threads to finish (even when some of them finished early due to an error).
*/
SemiFuture<void> _applyBatch(std::shared_ptr<executor::TaskExecutor> executor,
CancellationToken cancelToken,
CancelableOperationContextFactory factory);
/**
* Records the progress made by this applier to storage.
*/
void _clearAppliedOpsAndStoreProgress(OperationContext* opCtx);
std::unique_ptr<Env> _env;
// Identifier for the oplog source.
const ReshardingSourceId _sourceId;
const ReshardingOplogBatchPreparer _batchPreparer;
const ReshardingOplogApplicationRules _crudApplication;
const ReshardingOplogSessionApplication _sessionApplication;
const ReshardingOplogBatchApplier _batchApplier;
// Buffer for the current batch of oplog entries to apply.
OplogBatch _currentBatchToApply;
// Buffer for internally generated oplog entries that needs to be processed for this batch.
std::list<repl::OplogEntry> _currentDerivedOpsForCrudWriters;
std::list<repl::OplogEntry> _currentDerivedOpsForSessionWriters;
// The source of the oplog entries to be applied.
std::unique_ptr<ReshardingDonorOplogIteratorInterface> _oplogIter;
};
} // namespace mongo
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