[jira] [Commented] (ACCUMULO-925) Launch scripts should use a PIDfile

["Christopher Tubbs (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ACCUMULO-925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14563230#comment-14563230 ] 

Christopher Tubbs commented on ACCUMULO-925:
--------------------------------------------

Side note: FWIW, I believe systemd does this automatically. However, I'd consider systemd (and similar init systems) to be "downstream packaging", so there's no reason we can't provide a similar mechanism with our provided launch scripts.

> Launch scripts should use a PIDfile
> -----------------------------------
>
>                 Key: ACCUMULO-925
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-925
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: scripts
>            Reporter: Christopher Tubbs
>            Assignee: Billie Rinaldi
>         Attachments: ACCUMULO-925.1.patch
>
>
> Start scripts should create PIDfiles to store the PID of running processes in a well known location (example: /var/run/accumulo/tserver.pid or $ACCUMULO_HOME/tserver.pid), for the following benefits:
> # Identify running services on a machine without executing and parsing the system process list, so stop scripts can kill them when they are unresponsive.
> # Prevent multiple instances of the same application from starting up (an environment variable for the location of the PIDfile can be used to allow multiple instances if it is desirable to do so).
> # Potentially provide an alternate mechanism for terminating a process by deleting its PIDfile rather than its lock in Zookeeper.



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