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From "Wei Yan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2393) Fair Scheduler : Implement steady fair share
Date Sat, 16 Aug 2014 04:38:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-2393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14099499#comment-14099499
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Wei Yan commented on YARN-2393:
-------------------------------

bq. However, it is possible that the amShare becomes greater than what it should be for a
potentially lower instantaneous fairshare at a later time. We could preempt AM containers
as well, but need to tread this very carefully.
For the preemption, one concern is that "do we need to turn on the preemption.enabled". Users
may be confused if AM containers killed, but the preemption is disabled.


> Fair Scheduler : Implement steady fair share
> --------------------------------------------
>
>                 Key: YARN-2393
>                 URL: https://issues.apache.org/jira/browse/YARN-2393
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: Ashwin Shankar
>            Assignee: Wei Yan
>         Attachments: YARN-2393-1.patch, YARN-2393-2.patch, YARN-2393-3.patch
>
>
> Static fair share is a fair share allocation considering all(active/inactive) queues.It
would be shown on the UI for better predictability of finish time of applications.
> We would compute static fair share only when needed, like on queue creation, node added/removed.
Please see YARN-2026 for discussions on this. 



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