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https://issues.apache.org/jira/browse/SLING-5387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15992301#comment-15992301
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Chetan Mehrotra commented on SLING-5387:
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[~cziegeler] Have few more requests for this feature :)
# Add the scheduling info i.e. on which cluster instance a given job is planned
to be run to the Scheduler Status Printer in WebConsole. This would help in
determining where job is being run and hence from which cluster node the logs
need to be checked for any debugging work
# Have a feature flag to disable this behaviour i.e. a way to revert to old
behaviour where all such singleton jobs are scheduled on leader node.
> 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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