[jira] [Commented] (YARN-9671) Improve Locality Scheduling when cluster is busy

["Shilun Fan (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-9671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17802666#comment-17802666 ] 

Shilun Fan commented on YARN-9671:
----------------------------------

Bulk update: moved all 3.4.0 non-blocker issues, please move back if it is a blocker. Retarget 3.5.0.

> Improve Locality Scheduling when cluster is busy
> ------------------------------------------------
>
>                 Key: YARN-9671
>                 URL: https://issues.apache.org/jira/browse/YARN-9671
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.10.0, 3.3.0
>            Reporter: Muhammad Samir Khan
>            Assignee: Muhammad Samir Khan
>            Priority: Major
>         Attachments: YARN-9671.001.patch
>
>
> When a cluster is very busy, scheduling opportunities are few and far between. Scheduling opportunities are how an application knows when to give up looking for decent locality.
> It doesn't make sense to work hard waiting for locality when the odds of it coming are very small and it may actually take a very long time to actually give up.
> This causes the priority of queues to be violated which is the last thing we want to do when the cluster is full.
> Add a mode to disable skipping locality when cluster is busy.



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