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https://issues.apache.org/jira/browse/YARN-5077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15301694#comment-15301694
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Yufei Gu commented on YARN-5077:
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[~kasha], That's my first reaction when you introduced how it works. If a queue
can get resources assigned even if the fairshare is zero, why we have this bug.
I first tested it with a unmanaged AM. It can get the resources even its weight
is zero. Then a managed AM cannot get the resources because its maxAMResource
always is zero, and maxAMResource is calculated by multiplying faireshare and
maxAMShare.
Do you suggest we can change the algorithm of calculating maxAMResource to
solve this problem?
> 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: Yufei Gu
> Attachments: YARN-5077.001.patch, YARN-5077.002.patch,
> YARN-5077.003.patch, YARN-5077.004.patch, YARN-5077.005.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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