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https://issues.apache.org/jira/browse/MAPREDUCE-1317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12793994#action_12793994
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Hong Tang commented on MAPREDUCE-1317:
--------------------------------------
The 2 failed unit tests in rumen were caused by my false assumption that
LoggedXXX objects are immutable - while in fact the HadoopLogAnalyzer actually
mutates the List<LoggedTaskAttempt> object returned from the getter method. I
restore the original semantics by creating an empty list instead of using
Collections.emptyList().
I filed MAPREDUCE-1330 to propose to make LoggedXXX APIs more consistent in
this regard.
> Reducing memory consumption of rumen objects
> --------------------------------------------
>
> Key: MAPREDUCE-1317
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1317
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Hong Tang
> Assignee: Hong Tang
> Fix For: 0.21.0, 0.22.0
>
> Attachments: mapreduce-1317-20091218.patch,
> mapreduce-1317-20091222-2.patch, mapreduce-1317-20091222.patch,
> mapreduce-1317-20091223.patch
>
>
> We have encountered OutOfMemoryErrors in mumak and gridmix when dealing with
> very large jobs. The purpose of this jira is to optimze memory consumption of
> rumen produced job objects.
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