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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-925) Launch scripts should use a PIDfile
Date Mon, 29 Jun 2015 23:15:04 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14606635#comment-14606635
] 

Josh Elser commented on ACCUMULO-925:
-------------------------------------

It could. The issue at the moment is that stopping is just a manual hand-jam thing. Ideally,
when we move towards a script dedicated to starting and stopping (this patch really only contains
starting), we can consolidate the two SSHs into one. My only concern at the time is that we
would double the number of SSH calls we make, but I don't think that is the case looking at
the old 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
>             Fix For: 1.8.0
>
>         Attachments: ACCUMULO-925.1.patch, ACCUMULO-925.2.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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