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From "Andrey Klochkov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1183) MiniYARNCluster shutdown takes several minutes intermittently
Date Tue, 22 Oct 2013 17:22:42 GMT

    [ https://issues.apache.org/jira/browse/YARN-1183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802033#comment-13802033
] 

Andrey Klochkov commented on YARN-1183:
---------------------------------------

I don't think concurrency level can make any difference here. The change was requested by
Karthik.

> MiniYARNCluster shutdown takes several minutes intermittently
> -------------------------------------------------------------
>
>                 Key: YARN-1183
>                 URL: https://issues.apache.org/jira/browse/YARN-1183
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Andrey Klochkov
>            Assignee: Andrey Klochkov
>         Attachments: YARN-1183--n2.patch, YARN-1183--n3.patch, YARN-1183--n4.patch, YARN-1183.patch
>
>
> As described in MAPREDUCE-5501 sometimes M/R tests leave MRAppMaster java processes living
for several minutes after successful completion of the corresponding test. There is a concurrency
issue in MiniYARNCluster shutdown logic which leads to this. Sometimes RM stops before an
app master sends it's last report, and then the app master keeps retrying for >6 minutes.
In some cases it leads to failures in subsequent tests, and it affects performance of tests
as app masters eat resources.



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