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Posted to yarn-issues@hadoop.apache.org by "Wei Yan (JIRA)" <ji...@apache.org> on 2014/05/24 00:28:02 UTC

[jira] [Commented] (YARN-2099) Preemption in fair scheduler should consider app priorities

    [ https://issues.apache.org/jira/browse/YARN-2099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14007789#comment-14007789 ] 

Wei Yan commented on YARN-2099:
-------------------------------

Hi, Ashwin.
We have discussed a little bit about the priority and preemption in YARN-596. The old preemption implementation is based on container's priority, and YARN-596 starts to consider fairshare.

Have one question here, consider all queues deploy fair share policy. By taking app priorities, if we want to preempt a container, which option do we deploy? (1) We collect all running apps from over-fairshare queues, and select the one with the lowest priority as the candidate, or (2) We firstly choose the queue which is most over its fair share, then the select the app with the lowest priority inside that queue as the candidate.

> Preemption in fair scheduler should consider app priorities
> -----------------------------------------------------------
>
>                 Key: YARN-2099
>                 URL: https://issues.apache.org/jira/browse/YARN-2099
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, resourcemanager
>    Affects Versions: 2.5.0
>            Reporter: Ashwin Shankar
>
> Fair scheduler should take app priorities into account while
> preempting containers.



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