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/**
* Copyright (C) 2021-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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/s/resharding/resharding_oplog_batch_applier.h"
#include <memory>
#include "mongo/db/s/operation_sharding_state.h"
#include "mongo/db/s/resharding/resharding_data_copy_util.h"
#include "mongo/db/s/resharding/resharding_future_util.h"
#include "mongo/db/s/resharding/resharding_oplog_application.h"
#include "mongo/db/s/resharding/resharding_oplog_session_application.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kResharding
namespace mongo {
ReshardingOplogBatchApplier::ReshardingOplogBatchApplier(
const ReshardingOplogApplicationRules& crudApplication,
const ReshardingOplogSessionApplication& sessionApplication)
: _crudApplication(crudApplication), _sessionApplication(sessionApplication) {}
template <bool IsForSessionApplication>
SemiFuture<void> ReshardingOplogBatchApplier::applyBatch(
OplogBatch batch,
std::shared_ptr<executor::TaskExecutor> executor,
CancellationToken cancelToken,
CancelableOperationContextFactory factory) const {
struct ChainContext {
OplogBatch batch;
size_t nextToApply = 0;
};
auto chainCtx = std::make_shared<ChainContext>();
chainCtx->batch = std::move(batch);
return resharding::WithAutomaticRetry<unique_function<SemiFuture<void>()>>(
[this, chainCtx, cancelToken, factory] {
// Writing `auto& i = chainCtx->nextToApply` takes care of incrementing
// chainCtx->nextToApply on each loop iteration.
for (auto& i = chainCtx->nextToApply; i < chainCtx->batch.size(); ++i) {
const auto& oplogEntry = *chainCtx->batch[i];
auto opCtx = factory.makeOperationContext(&cc());
if constexpr (IsForSessionApplication) {
auto conflictingTxnCompletionFuture =
_sessionApplication.tryApplyOperation(opCtx.get(), oplogEntry);
if (conflictingTxnCompletionFuture) {
return future_util::withCancellation(
std::move(*conflictingTxnCompletionFuture), cancelToken);
}
} else {
// ReshardingOpObserver depends on the collection metadata being known
// when processing writes to the temporary resharding collection. We
// attach shard version IGNORED to the write operations and retry once
// on a StaleConfig exception to allow the collection metadata
// information to be recovered.
ScopedSetShardRole scopedSetShardRole(
opCtx.get(),
_crudApplication.getOutputNss(),
ShardVersion::IGNORED() /* shardVersion */,
boost::none /* databaseVersion */);
resharding::data_copy::withOneStaleConfigRetry(opCtx.get(), [&] {
uassertStatusOK(
_crudApplication.applyOperation(opCtx.get(), oplogEntry));
});
}
}
return makeReadyFutureWith([] {}).semi();
})
.onTransientError([](const Status& status) {
LOGV2(5615800,
"Transient error while applying oplog entry from donor shard",
"error"_attr = redact(status));
})
.onUnrecoverableError([](const Status& status) {
LOGV2_ERROR(
5615801,
"Operation-fatal error for resharding while applying oplog entry from donor shard",
"error"_attr = redact(status));
})
.template until<Status>([chainCtx](const Status& status) {
return status.isOK() && chainCtx->nextToApply >= chainCtx->batch.size();
})
.on(std::move(executor), cancelToken)
// There isn't a guarantee that the reference count to `executor` has been decremented after
// .on() returns. We schedule a trivial task on the task executor to ensure the callback's
// destructor has run. Otherwise `executor` could end up outliving the ServiceContext and
// triggering an invariant due to the task executor's thread having a Client still.
.onCompletion([](auto x) { return x; })
.semi();
}
template SemiFuture<void> ReshardingOplogBatchApplier::applyBatch<false>(
OplogBatch batch,
std::shared_ptr<executor::TaskExecutor> executor,
CancellationToken cancelToken,
CancelableOperationContextFactory factory) const;
template SemiFuture<void> ReshardingOplogBatchApplier::applyBatch<true>(
OplogBatch batch,
std::shared_ptr<executor::TaskExecutor> executor,
CancellationToken cancelToken,
CancelableOperationContextFactory factory) const;
} // namespace mongo
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