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https://issues.apache.org/jira/browse/MAPREDUCE-4715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Boris Ryakhovskiy updated MAPREDUCE-4715:
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Attachment: VisualVM_screenshot.png
VisualVM screenshot attached
> Heap memory growing when JVM reuse option enabled
> -------------------------------------------------
>
> Key: MAPREDUCE-4715
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4715
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: job submission
> Affects Versions: 0.20.2
> Environment: Linux, cdh3u5
> Reporter: Boris Ryakhovskiy
> Priority: Minor
> Attachments: VisualVM_screenshot.png
>
>
> When mapred.job.reuse.jvm.num.tasks option is set to 100 or more tasks, JVM
> fails with "java.lang.OutOfMemoryError: Java heap space" error message. Jobs
> itself are small and job heap size is set to -Xmx200m .
> It looks like the reason of the issue is a FileSystem$Cache object which
> collects JobConf objects from all jobs which were executed in current JVM. GC
> root for the FileSystem$Cache is ApplicationShutdownHooks class (cannot
> attach screenshot from visualvm)
> In my case each of JobConf objects allocates ~500K (50M total in case of 100
> jobs).
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