[jira] [Created] (YARN-7280) Reload fair-scheduler.xml every n seconds

["Andras Piros (JIRA)" <ji...@apache.org>]

Andras Piros created YARN-7280:
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             Summary: Reload 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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