[jira] [Created] (CASSANDRA-10920) Let systemd know if Cassandra is running

["Severin Leonhardt (JIRA)" <ji...@apache.org>]

Severin Leonhardt created CASSANDRA-10920:
---------------------------------------------

             Summary: Let systemd know if Cassandra is running
                 Key: CASSANDRA-10920
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10920
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Severin Leonhardt
            Priority: Minor


Checking the status of the Cassandra service on CentOS 7 shows this:
{noformat}
$ systemctl status cassandra
● cassandra.service - SYSV: Starts and stops Cassandra
   Loaded: loaded (/etc/rc.d/init.d/cassandra)
   Active: active (exited) since Fri 2015-12-18 13:30:02 CET; 3 days ago
     Docs: man:systemd-sysv-generator(8)
...
{noformat}

The same is shown after the Cassandra process is killed or dies by itself. Notice this part: _Active: active (exited)_

Starting Cassandra through {{systemctl start cassandra}} will not work, because systemd still thinks the service is running.

According to the [systemd documentation regarding compatibility with SysV|http://www.freedesktop.org/wiki/Software/systemd/Incompatibilities/] this is expected behavior. Systemd doesn't know the PID of the Cassandra process and thus can't check if the service is running or not.

It is suggested to add the following to the SysV script header comment:

{noformat}
# pidfile: /var/run/cassandra/cassandra.pid
{noformat}

After adding this manually systemd correctly detected the state of the Cassandra process on our machines.




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