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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4087) [Gridmix] GenerateDistCacheData job of Gridmix can become slow in some cases
Date Fri, 30 Mar 2012 11:50:26 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242275#comment-13242275
] 

Hadoop QA commented on MAPREDUCE-4087:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12520592/4087.patch
  against trunk revision .

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

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +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 passed unit tests in .

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2115//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2115//console

This message is automatically generated.
                
> [Gridmix] GenerateDistCacheData job of Gridmix can become slow in some cases
> ----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4087
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4087
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Ravi Gummadi
>            Assignee: Ravi Gummadi
>         Attachments: 4087.patch, 4087.trunk.patch
>
>
> In map() method of GenerateDistCacheData job of Gridmix, val.setSize() is done every
time based on the bytes to be written to a distributed cache file. When we try to write data
to next distributed cache file in the same map task, the size of random data generated in
each iteration can become small based on the particular case. This can make this dist cache
data generation slow.

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