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https://issues.apache.org/jira/browse/YARN-3933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17774321#comment-17774321
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dzcxzl commented on YARN-3933:
------------------------------

Note that branch 2.8 is not consistent with branch 3.0 and branch2.9 fixes.

branch 3.0

https://github.com/apache/hadoop/commit/646c6d6509f515b1373288869fb92807fa2ddc9b

branch 2.8

https://github.com/apache/hadoop/commit/233252aa9a2f1e2dfc2a5206676b6b8e462d5e7e

> FairScheduler: Multiple calls to completedContainer are not safe
> ----------------------------------------------------------------
>
>                 Key: YARN-3933
>                 URL: https://issues.apache.org/jira/browse/YARN-3933
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.7.1
>            Reporter: Lavkesh Lahngir
>            Assignee: Shiwei Guo
>            Priority: Major
>              Labels: oct16-medium
>             Fix For: 2.8.0, 3.0.0-alpha4
>
>         Attachments: YARN-3933.001.patch, YARN-3933.002.patch, 
> YARN-3933.003.patch, YARN-3933.004.patch, YARN-3933.005.patch, 
> YARN-3933.006.patch, yarn-3933-branch-2.8.patch
>
>
> In our cluster we are seeing available memory and cores being negative. 
> Initial inspection:
> Scenario no. 1: 
> In capacity scheduler the method allocateContainersToNode() checks if 
> there are excess reservation of containers for an application, and they are 
> no longer needed then it calls queue.completedContainer() which causes 
> resources being negative. And they were never assigned in the first place. 
> I am still looking through the code. Can somebody suggest how to simulate 
> excess containers assignments ?



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