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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3812) Lower default allocation sizes, fix allocation configurations and document them
Date Sun, 22 Apr 2012 05:16:48 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259000#comment-13259000
] 

Hadoop QA commented on MAPREDUCE-3812:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12523665/MAPREDUCE-3812.patch
  against trunk revision .

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

    +1 tests included.  The patch appears to include 5 new or modified test files.

    +1 javadoc.  The javadoc tool did not generate any 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 failed these unit tests:
                  org.apache.hadoop.yarn.server.TestContainerManagerSecurity
                  org.apache.hadoop.yarn.server.resourcemanager.security.TestApplicationTokens
                  org.apache.hadoop.yarn.server.resourcemanager.TestClientRMService
                  org.apache.hadoop.yarn.server.resourcemanager.resourcetracker.TestNMExpiry
                  org.apache.hadoop.yarn.server.resourcemanager.TestAMAuthorization
                  org.apache.hadoop.yarn.server.resourcemanager.TestApplicationACLs
                  org.apache.hadoop.mapred.TestClientRedirect
                  org.apache.hadoop.mapreduce.security.TestJHSSecurity

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2269//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2269//console

This message is automatically generated.
                
> Lower default allocation sizes, fix allocation configurations and document them
> -------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3812
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3812
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mrv2, performance
>    Affects Versions: 0.23.0
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Harsh J
>         Attachments: MAPREDUCE-3812-20120205.txt, MAPREDUCE-3812-20120206.1.txt, MAPREDUCE-3812-20120206.txt,
MAPREDUCE-3812.patch, MAPREDUCE-3812.patch, MAPREDUCE-3812.patch, MAPREDUCE-3812.patch, MAPREDUCE-3812.patch
>
>
> After a few performance improvements tracked at MAPREDUCE-3561, like MAPREDUCE-3511 and
MAPREDUCE-3567, even a 100K maps job can also run within 1GB vmem. We earlier increased AM
slot size from 1 slot to two slots to work around the issues with AM heap. Now that those
are fixed, we should go back to 1GB.
> This is just a configuration change.
> [P.s.]:
> - Currently min/max alloc is set at a per-scheduler config level, which makes no sense
as there's no way to run multiple schedulers anyway. Switch configs to use a generic RM-config.
> - The min/max alloc configs aren't documented and we ought to document it (i.e. MAPREDUCE-4027)
> - 1 GB is perhaps too high for a slot's minimum. While job defaults can be left at such
values, we should lower the minimum alloc to 128 MB to allow special requests of low memory
out of the box itself. Shouldn't impact MR App in any way.

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