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From "Yufei Gu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5077) Fix FSLeafQueue#getFairShare() for queues with weight 0.0
Date Tue, 24 May 2016 23:49:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-5077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15299170#comment-15299170
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Yufei Gu commented on YARN-5077:
--------------------------------

BTW, we already have a test case {{testFairShareWithZeroWeightNoneZeroMinRes}} to test zero
weight queue with a minResource. I modified it a little to let it make more sense.

> Fix FSLeafQueue#getFairShare() for queues with weight 0.0
> ---------------------------------------------------------
>
>                 Key: YARN-5077
>                 URL: https://issues.apache.org/jira/browse/YARN-5077
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Yufei Gu
>            Assignee: Karthik Kambatla
>         Attachments: YARN-5077.001.patch, YARN-5077.002.patch, YARN-5077.003.patch, YARN-5077.004.patch
>
>
> 1) When a queue's weight is set to 0.0, FSLeafQueue#getFairShare() returns <memory:0,
vCores:0> 
> 2) When a queue's weight is nonzero, FSLeafQueue#getFairShare() returns <memory:16384,
vCores:8>
> In case 1), that means no container ever gets allocated for an AM because from the viewpoint
of the RM, there is never any headroom to allocate a container on that queue.
> For example, we have a pool with the following weights: 
> - root.dev 0.0 
> - root.product 1.0
> The root.dev is a best effort pool and should only get resources if root.product is not
running. In our tests, with no jobs running under root.product, jobs started in root.dev queue
stay stuck in ACCEPT phase and never start.



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