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Posted to yarn-issues@hadoop.apache.org by "Muhammad Samir Khan (JIRA)" <ji...@apache.org> on 2019/07/15 18:15:00 UTC
[jira] [Commented] (YARN-9671) Improve Locality Scheduling when
cluster is busy
[ https://issues.apache.org/jira/browse/YARN-9671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16885468#comment-16885468 ]
Muhammad Samir Khan commented on YARN-9671:
-------------------------------------------
Edited description: will handle priority inversion metrics separately in another jira.
> 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
> Reporter: Muhammad Samir Khan
> Assignee: Muhammad Samir Khan
> Priority: Major
>
> 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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