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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/periodic_runner_job_abort_expired_transactions.h"
#include "mongo/db/client.h"
#include "mongo/db/service_context.h"
#include "mongo/db/session/kill_sessions_local.h"
#include "mongo/db/transaction/transaction_participant.h"
#include "mongo/db/transaction/transaction_participant_gen.h"
#include "mongo/logv2/log.h"
#include "mongo/util/periodic_runner.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kStorage
namespace mongo {
namespace {
using Argument = decltype(TransactionParticipant::observeTransactionLifetimeLimitSeconds)::Argument;
// When setting the period for this job, we wait 500ms for every second, so that we abort
// expired transactions every transactionLifetimeLimitSeconds/2
Milliseconds getPeriod(const Argument& transactionLifetimeLimitSeconds) {
Milliseconds period(transactionLifetimeLimitSeconds * 500);
// Ensure: 1 <= period <= 60 seconds
period = (period < Seconds(1)) ? Milliseconds(Seconds(1)) : period;
period = (period > Seconds(60)) ? Milliseconds(Seconds(60)) : period;
return period;
}
} // namespace
auto PeriodicThreadToAbortExpiredTransactions::get(ServiceContext* serviceContext)
-> PeriodicThreadToAbortExpiredTransactions& {
auto& jobContainer = _serviceDecoration(serviceContext);
jobContainer._init(serviceContext);
return jobContainer;
}
auto PeriodicThreadToAbortExpiredTransactions::operator*() const noexcept -> PeriodicJobAnchor& {
stdx::lock_guard lk(_mutex);
return *_anchor;
}
auto PeriodicThreadToAbortExpiredTransactions::operator->() const noexcept -> PeriodicJobAnchor* {
stdx::lock_guard lk(_mutex);
return _anchor.get();
}
void PeriodicThreadToAbortExpiredTransactions::_init(ServiceContext* serviceContext) {
stdx::lock_guard lk(_mutex);
if (_anchor) {
return;
}
auto periodicRunner = serviceContext->getPeriodicRunner();
invariant(periodicRunner);
PeriodicRunner::PeriodicJob job(
"abortExpiredTransactions",
[](Client* client) {
// The opCtx destructor handles unsetting itself from the
// Client. (The PeriodicRunner's Client must be reset before
// returning.)
auto opCtx = client->makeOperationContext();
// Set the Locker such that all lock requests' timeouts will
// be overridden and set to 0. This prevents the expired
// transaction aborter thread from stalling behind any
// non-transaction, exclusive lock taking operation blocked
// behind an active transaction's intent lock.
opCtx->lockState()->setMaxLockTimeout(Milliseconds(0));
// This thread needs storage rollback to complete timely, so instruct the storage
// engine to not do any extra eviction for this thread, if supported.
opCtx->recoveryUnit()->setNoEvictionAfterRollback();
try {
killAllExpiredTransactions(opCtx.get());
} catch (ExceptionForCat<ErrorCategory::CancellationError>& ex) {
LOGV2_DEBUG(4684101, 2, "Periodic job canceled", "{reason}"_attr = ex.reason());
}
},
getPeriod(gTransactionLifetimeLimitSeconds.load()),
// TODO(SERVER-74656): Please revisit if this periodic job could be made killable.
false /*isKillableByStepdown*/);
_anchor = std::make_shared<PeriodicJobAnchor>(periodicRunner->makeJob(std::move(job)));
TransactionParticipant::observeTransactionLifetimeLimitSeconds.addObserver([anchor = _anchor](
const Argument&
secs) {
try {
anchor->setPeriod(getPeriod(secs));
} catch (const DBException& ex) {
LOGV2(
20892,
"Failed to update period of thread which aborts expired transactions {ex_toStatus}",
"ex_toStatus"_attr = ex.toStatus());
}
});
}
} // namespace mongo
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