[jira] [Assigned] (SLING-5387) Provide support for running singleton jobs on non leader cluster nodes also

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

     [ https://issues.apache.org/jira/browse/SLING-5387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carsten Ziegeler reassigned SLING-5387:
---------------------------------------

    Assignee: Carsten Ziegeler

> Provide support for running singleton jobs on non leader cluster nodes also
> ---------------------------------------------------------------------------
>
>                 Key: SLING-5387
>                 URL: https://issues.apache.org/jira/browse/SLING-5387
>             Project: Sling
>          Issue Type: Improvement
>          Components: Commons
>            Reporter: Chetan Mehrotra
>            Assignee: Carsten Ziegeler
>             Fix For: Commons Scheduler 2.5.4
>
>
> With SLING-2979 support for running singleton jobs on specific instance was provided. In most cases we want to run  a job as singleton and not want to "pin" it to specific nodes. For this {{scheduler.runOn}} needs to be set to {{SINGLE}}.
> However per [current implementation|https://github.com/apache/sling/blob/org.apache.sling.commons.scheduler-2.4.14/src/main/java/org/apache/sling/commons/scheduler/impl/QuartzJobExecutor.java#L64] {{SINGLE}} is treated as {{LEADER}}. This effectively causes *all singleton* jobs to get executed on leader only thus putting extra load.
> For better utilization of cluster resources it should be possible to distribute such singleton jobs on other cluster nodes and still ensure that singleton contract is honoured!
> We would like to make use of this feature to ensure Oak AsyncIndexTask to run on different cluster nodes (OAK-2749) 



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