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https://issues.apache.org/jira/browse/MAPREDUCE-4301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Graves updated MAPREDUCE-4301:
-------------------------------------
Resolution: Fixed
Fix Version/s: 0.23.3
Status: Resolved (was: Patch Available)
+1 Thanks Bobby. I committed this to trunk, branch-2, and branch-23
> 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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