Boris Ryakhovskiy created MAPREDUCE-4715:
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Summary: 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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