[jira] [Updated] (YARN-3388) Allocation in LeafQueue could get stuck because DRF calculator isn't well supported when computing user-limit

["Nathan Roberts (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-3388?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nathan Roberts updated YARN-3388:
---------------------------------
    Attachment: YARN-3388-v4.patch

Thanks for the comments [~jlowe]. upmerged and added whitespace.

> Allocation in LeafQueue could get stuck because DRF calculator isn't well supported when computing user-limit
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3388
>                 URL: https://issues.apache.org/jira/browse/YARN-3388
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.6.0
>            Reporter: Nathan Roberts
>            Assignee: Nathan Roberts
>         Attachments: YARN-3388-v0.patch, YARN-3388-v1.patch, YARN-3388-v2.patch, YARN-3388-v3.patch, YARN-3388-v4.patch
>
>
> When there are multiple active users in a queue, it should be possible for those users to make use of capacity up-to max_capacity (or close). The resources should be fairly distributed among the active users in the queue. This works pretty well when there is a single resource being scheduled.   However, when there are multiple resources the situation gets more complex and the current algorithm tends to get stuck at Capacity. 
> Example illustrated in subsequent comment.



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