SERVER-33295 Periodic task to check for and kill expired transactions.

(Adding a new int server parameter 'transactionLifetimeLimitSeconds'.)

1 files changed, 45 insertions, 0 deletions

diff --git a/src/mongo/db/periodic_runner_job_abort_expired_transactions.h b/src/mongo/db/periodic_runner_job_abort_expired_transactions.h
new file mode 100644
index 00000000000..28ab86d1b64
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+++ b/src/mongo/db/periodic_runner_job_abort_expired_transactions.h
@@ -0,0 +1,45 @@
+/**
+ * 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.
+ */
+
+#pragma once
+
+namespace mongo {
+
+class ServiceContext;
+
+/**
+ * Defines and starts a periodic background job to check for and abort expired transactions.
+ * The job will run every (transactionLifetimeLimitSeconds/2) seconds, or at most once per second
+ * and at least once per minute.
+ *
+ * This function should only ever be called once, during mongod server startup (db.cpp).
+ * The PeriodicRunner will handle shutting down the job on shutdown, no extra handling necessary.
+ */
+void startPeriodicThreadToAbortExpiredTransactions(ServiceContext* serviceContext);
+
+}  // namespace mongo