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https://issues.apache.org/jira/browse/YARN-7280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16187556#comment-16187556
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Yufei Gu commented on YARN-7280:
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Fair scheduler has supported that for quite a while.
{quote}
The allocation file is reloaded every 10 seconds, allowing changes to be made
on the fly.
{quote}
Check fair scheduler doc for more details.
https://hadoop.apache.org/docs/r2.7.4/hadoop-yarn/hadoop-yarn-site/FairScheduler.html
> Rescan fair-scheduler.xml every n seconds
> -----------------------------------------
>
> Key: YARN-7280
> URL: https://issues.apache.org/jira/browse/YARN-7280
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Affects Versions: 3.0.0-alpha4
> Reporter: Andras Piros
> Assignee: Andras Piros
>
> Currently, the {{FairScheduler}} configuration file {{fair-scheduler.xml}} is
> loaded only on ResourceManager startup.
> We need:
> * a mechanism to rescan / reload-if-changed this, often-changing piece of RM
> configuration
> * from classpath / configuration file:
> ** configuration file wins over classpath
> * rescan every {{n}} seconds, where:
> ** {{n <= 0}} means don't rescan
> ** {{n > 0}} means rescan every {{n}} seconds
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