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https://issues.apache.org/jira/browse/MAPREDUCE-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843484#action_12843484
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Hadoop QA commented on MAPREDUCE-1306:
--------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  
http://issues.apache.org/jira/secure/attachment/12438267/MAPREDUCE-1306-20100308.patch
  against trunk revision 921230.

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

    +1 tests included.  The patch appears to include 10 new or modified tests.

    +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 findbugs.  The patch does not introduce any new Findbugs warnings.

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

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

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

Test results: 
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/515/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/515/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: 
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/515/artifact/trunk/build/test/checkstyle-errors.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/515/console

This message is automatically generated.

> [MUMAK] Randomize the arrival of heartbeat responses
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-1306
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1306
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/mumak
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Tamas Sarlos
>            Assignee: Tamas Sarlos
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: MAPREDUCE-1306-20100108.patch, 
> MAPREDUCE-1306-20100308-hong.patch, MAPREDUCE-1306-20100308.patch
>
>
> We propose to make the following changes to mumak, MAPREDUCE-728
> - make the timing of heartbeat responses more realistic by adding an option 
> to randomly perturb them
> - randomize the startup time of task trackers in a fixed interval 
> - remove 2 magic constants from SimulatorEngine and make sure that the first 
> job is submitted only after the entire cluster is up and running

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