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https://issues.apache.org/jira/browse/MAPREDUCE-4301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13289372#comment-13289372
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Hudson commented on MAPREDUCE-4301:
-----------------------------------
Integrated in Hadoop-Hdfs-0.23-Build #278 (See
[https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/278/])
merge -r 1346002:1346003 from branch-2. FIXES: MAPREDUCE-4301 (Revision
1346004)
Result = SUCCESS
tgraves :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1346004
Files :
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/split/SplitMetaInfoReader.java
> Dedupe some strings in MRAM for memory savings
> ----------------------------------------------
>
> Key: MAPREDUCE-4301
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4301
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: applicationmaster
> Affects Versions: 0.23.3, 2.0.0-alpha
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Fix For: 0.23.3
>
> Attachments: MR-4301.txt
>
>
> Recently an OutOfMemoryError caused one of our jobs to become a zombie
> (MAPREDUCE-4300). It was a rather large job with 78000+ map tasks and only
> 750MB of heap configured. I took a heap dump to see if there were any
> obvious memory leaks, and I could not find any, but yourkit and some digging
> found some potential memory optimizations that we could do.
> In this particular case we could save about 20MB if
> SplitMetaInfoReader.readSplitMetaInfo only computed the JobSplitFile once
> instead of for each split. (a 2 line change)
> I will look into some others and see if there are more savings I can come up
> with.
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