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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5279) Jobs can deadlock if headroom is limited by cpu instead of memory
Date Fri, 19 Sep 2014 11:30:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140332#comment-14140332
] 

Hadoop QA commented on MAPREDUCE-5279:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12669975/apache-mapreduce-5279.6.patch
  against trunk revision 6fe5c6b.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4898//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4898//console

This message is automatically generated.

> Jobs can deadlock if headroom is limited by cpu instead of memory
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-5279
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5279
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, scheduler
>    Affects Versions: 2.0.3-alpha
>            Reporter: Peng Zhang
>            Assignee: Peng Zhang
>            Priority: Critical
>         Attachments: MAPREDUCE-5279-v2.patch, MAPREDUCE-5279.patch, apache-mapreduce-5279.3.patch,
apache-mapreduce-5279.4.patch, apache-mapreduce-5279.5.patch, apache-mapreduce-5279.6.patch
>
>
> YARN-2 imported cpu dimension scheduling, but MR RMContainerAllocator doesn't take into
account virtual cores while scheduling reduce tasks.
> This may cause more reduce tasks to be scheduled because memory is enough. And on a small
cluster, this will end with deadlock, all running containers are reduce tasks but map phase
is not finished. 



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