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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3784) maxActiveApplications(|PerUser) per queue is too low for small clusters
Date Thu, 02 Feb 2012 09:07:53 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198623#comment-13198623
] 

Hadoop QA commented on MAPREDUCE-3784:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12512920/MAPREDUCE-3784.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated 1 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in .

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1742//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1742//console

This message is automatically generated.
                
> maxActiveApplications(|PerUser) per queue is too low for small clusters
> -----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3784
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3784
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Ramya Sunil
>            Assignee: Arun C Murthy
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3784.patch, MAPREDUCE-3784.patch, MAPREDUCE-3784.patch
>
>
> We ran into this issue while testing on small clusters. 
> On a 7node cluster with 8G per node,  for a queue with absolute capacity 30%, user limit
100%, maxActiveApplications and maxActiveApplicationsPerUser is calculated to be 1.
> This means that even though the queue has 17GB(0.3*8*7), only 1 user can run 1 app at
a given time queuing up rest of the apps/users. This hurts performance on small clusters.

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