[jira] [Commented] (SLING-2979) Add support for running scheduled task on specific instances

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

    [ https://issues.apache.org/jira/browse/SLING-2979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725055#comment-13725055 ] 

Carsten Ziegeler commented on SLING-2979:
-----------------------------------------

I'Ve revised the implementation and changed the property to "scheduler.runOn" which can either have
- a string (array) of Sling IDs where this job should run
- the constant LEADER - to run on the leader only
- the constant SINGLE - to run on a single instance only

                
> Add support for running scheduled task on specific instances
> ------------------------------------------------------------
>
>                 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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