[jira] [Resolved] (SLING-2979) Add support for running scheduled task only on the leader

["Carsten Ziegeler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SLING-2979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carsten Ziegeler resolved SLING-2979.
-------------------------------------

    Resolution: Fixed

Added in 1507250

I've added support for the leader evaluation which is optional. So this scheduler still runs in systems without the discovery api - in that case the flag to restrict a job on running on the leader is ignored.
If the discovery api is available, the leader information is evaluated. To avoid registering/unregistering jobs when the leader changes (and keeping track of them etc.), all jobs are scheduled, however if a job should only run on a leader and it is scheduled on a non leader, then the its scheduled but not executed.
                
> Add support for running scheduled task only on the leader
> ---------------------------------------------------------
>
>                 Key: SLING-2979
>                 URL: https://issues.apache.org/jira/browse/SLING-2979
>             Project: Sling
>          Issue Type: New Feature
>          Components: Commons
>            Reporter: Carsten Ziegeler
>            Assignee: Carsten Ziegeler
>             Fix For: Commons Scheduler 2.4.0
>
>
> With the new topology api we have support for leader election. In many cases scheduled tasks should only run on a single instance in a cluster. So far this can only be done by manually adding the task through the Scheduler interface but not with the whiteboard support.
> We should add a new property scheduler.leaderonly which defaults to false but can be set to true. IN this case the task is only started on the leader.

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