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https://issues.apache.org/jira/browse/MAPREDUCE-2268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108197#comment-13108197
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Milind Bhandarkar commented on MAPREDUCE-2268:
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jvm reuse has very limited use in practice, especially on a multi-tenant
cluster. Also, with security enabled, jvm reuse tends to get used even more
rarely. In the 0.22 release notes, we should make a note of this, and should
make this jira not-a-blocker. Thoughts ?
> With JVM reuse, JvmManager doesn't delete last workdir properly
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-2268
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2268
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Blocker
> Fix For: 0.22.0
>
>
> In JvmManager, when a Jvm exits, it tries to delete the workdir for
> {{initalContext.task}} which is null, hence throwing NPE. Currently this NPE
> is swallowed into the abyss.
> We should catch exceptions out of the JvmRunner thread, add a test case that
> verifies this functionality, and fix this code to properly grab the last task.
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