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/**
* Copyright (C) 2018-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/recover_transaction_decision_from_local_participant.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/session_catalog_mongod.h"
#include "mongo/db/transaction_participant.h"
namespace mongo {
void recoverDecisionFromLocalParticipantOrAbortLocalParticipant(OperationContext* opCtx) {
ON_BLOCK_EXIT([opCtx] {
// Ensure waiting for the user-supplied writeConcern of the decision.
repl::ReplClientInfo::forClient(opCtx->getClient()).setLastOpToSystemLastOpTime(opCtx);
});
MongoDOperationContextSession checkOutSession(opCtx);
auto txnParticipant = TransactionParticipant::get(opCtx);
try {
if (txnParticipant->getActiveTxnNumber() < *opCtx->getTxnNumber()) {
// TODO (SERVER-38133): Remove the if-block and just execute the else-block.
// Until SERVER-38133, calling beginOrContinue with startTransaction=boost::none with a
// higher txnNumber than the local participant's txnNumber will return NoSuchTransaction
// *without* marking the transaction at the higher txnNumber as aborted. As a stop-gap,
// if the request's txnNumber is higher than the local participant's txnNumber,
// explicitly start a transaction at the higher txnNumber here by calling
// beginOrContinue with startTransaction=true; the higher transaction will be aborted
// below.
// After SERVER-38133, the new transaction will be started *and* aborted by calling
// beginOrContinue with startTransaction=boost::none.
txnParticipant->beginOrContinue(
*opCtx->getTxnNumber(), false /* autocommit */, true /* startTransaction */);
} else {
// If the local participant's transaction number is *equal* to this request's and
// corresponds to a *retryable write*, throws NoSuchTransaction, else is a no-op.
// If the local participant's transaction number is *higher* than this request's, throws
// TransactionTooOld.
txnParticipant->beginOrContinue(
*opCtx->getTxnNumber(), false /* autocommit */, boost::none /* startTransaction */);
}
// The local participant's txnNumber matched the request's txnNumber, and the txnNumber
// corresponds to a transaction (not a retryable write).
if (txnParticipant->transactionIsCommitted()) {
return;
}
txnParticipant->unstashTransactionResources(opCtx, "coordinateCommitTransaction");
} catch (const DBException& e) {
// Convert a PreparedTransactionInProgress error to an anonymous error code.
uassert(51021,
str::stream() << "coordinateCommitTransaction found local participant for "
<< opCtx->getLogicalSessionId()->getId()
<< ":"
<< *opCtx->getTxnNumber()
<< " is prepared but no "
"active coordinator exists",
e.code() != ErrorCodes::PreparedTransactionInProgress);
throw;
}
// Abort the transaction. Since there was no active coordinator for this transaction on this
// node, either the coordinator has already timed out waiting for the participant list and
// the local participant's transaction will time out and abort anyway, or another node in
// this replica set has stepped up and received all the transaction statements and may
// commit. It's safe to abort the transaction even if the latter is the case, because this
// command will fail waiting for majority writeConcern.
txnParticipant->abortActiveTransaction(opCtx);
uassert(ErrorCodes::NoSuchTransaction,
"Transaction was aborted",
txnParticipant->transactionIsCommitted());
}
} // namespace mongo
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