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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7587) Skip dispatching opportunistic containers to nodes whose queue is already full
Date Thu, 30 Nov 2017 22:13:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16273572#comment-16273572
] 

Arun Suresh commented on YARN-7587:
-----------------------------------

Thanks for the patch [~cheersyang].
Rather than performing an extra iteration to filter the list, maybe it might be better to
modify the {{getMetric}} method in the comparator to return MAX_INT / MIN_INT where appropriate
if the isQueueFull is true for the clusternode ?
Also was thinking, we should do the same for de-comissioned nodes as well.

> Skip dispatching opportunistic containers to nodes whose queue is already full
> ------------------------------------------------------------------------------
>
>                 Key: YARN-7587
>                 URL: https://issues.apache.org/jira/browse/YARN-7587
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.9.0
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>         Attachments: YARN-7587.001.patch
>
>
> When there is a lot of opportunistic container requests, even if NM queue is full, RM
continues to dispatch O containers to that node. Such allocations will be killed immediately
by NM causing a waste of resource. Propose to exclude such nodes in the load monitor.



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