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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4105) Capacity Scheduler headroom for DRF is wrong
Date Fri, 04 Sep 2015 14:51:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14730906#comment-14730906
] 

Jason Lowe commented on YARN-4105:
----------------------------------

Test failures are unrelated.  Committing this.

> Capacity Scheduler headroom for DRF is wrong
> --------------------------------------------
>
>                 Key: YARN-4105
>                 URL: https://issues.apache.org/jira/browse/YARN-4105
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.6.0
>            Reporter: Chang Li
>            Assignee: Chang Li
>         Attachments: YARN-4105.2.patch, YARN-4105.3.patch, YARN-4105.4.patch, YARN-4105.patch
>
>
> relate to the problem discussed in YARN-1857. But the min method is flawed when we are
using DRC. Have run into a real scenario in production where queueCapacity: <memory:1056256,
vCores:3750>, qconsumed: <memory:1054720, vCores:361>, consumed: <memory:125952,
vCores:170> limit: <memory:214016, vCores:755>.  headRoom calculation returns 88064
where there is only 1536 left in the queue because DRC effectively compare by vcores. It then
caused deadlock because RMcontainer allocator thought there is still space for mapper and
won't preempt a reducer in a full queue to schedule a mapper. Propose fix with componentwiseMin.




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