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/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include "mongo/db/periodic_runner_job_decrease_snapshot_cache_pressure.h"
#include "mongo/db/client.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/db/snapshot_window_options.h"
#include "mongo/db/snapshot_window_util.h"
#include "mongo/util/log.h"
#include "mongo/util/periodic_runner.h"
namespace mongo {
void startPeriodicThreadToDecreaseSnapshotHistoryCachePressure(ServiceContext* serviceContext) {
// Enforce calling this function once, and only once.
static bool firstCall = true;
invariant(firstCall);
firstCall = false;
auto periodicRunner = serviceContext->getPeriodicRunner();
invariant(periodicRunner);
// PeriodicRunner does not currently support altering the period of a job. So we are giving this
// job a 1 second period on PeriodicRunner and incrementing a static variable 'seconds' on each
// run until we reach checkCachePressurePeriodSeconds, at which point we run the code and reset
// 'seconds'. Etc.
PeriodicRunner::PeriodicJob job(
"startPeriodicThreadToDecreaseSnapshotHistoryCachePressure",
[](Client* client) {
try {
static int seconds = 0;
int checkPressurePeriod =
snapshotWindowParams.checkCachePressurePeriodSeconds.load();
invariant(checkPressurePeriod >= 1);
if (++seconds <= checkPressurePeriod) {
return;
}
seconds = 0;
// The opCtx destructor handles unsetting itself from the Client.
// (The PeriodicRunnerASIO's Client must be reset before returning.)
auto opCtx = client->makeOperationContext();
SnapshotWindowUtil::decreaseTargetSnapshotWindowSize(opCtx.get());
} catch (const DBException& ex) {
if (!ErrorCodes::isShutdownError(ex.toStatus().code())) {
warning() << "Periodic task to check for and decrease cache pressure caused by "
"maintaining too much snapshot history failed! Caused by: "
<< ex.toStatus();
}
}
},
Seconds(1));
periodicRunner->scheduleJob(std::move(job));
}
} // namespace mongo
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