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https://issues.apache.org/jira/browse/MAPREDUCE-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828941#action_12828941
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Hemanth Yamijala commented on MAPREDUCE-1435:
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As discussed offline, we probably need a unit test coverage for the changes in
TaskRunner.setupWorkDir as well. Can you please include that ? Also, we may
want to add a public distributed cache file in the streaming test case and
ensure its permissions do not change too.
> symlinks in cwd of the task are not handled properly after MAPREDUCE-896
> ------------------------------------------------------------------------
>
> Key: MAPREDUCE-1435
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1435
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 0.22.0
> Reporter: Amareshwari Sriramadasu
> Assignee: Ravi Gummadi
> Fix For: 0.22.0
>
> Attachments: 1435.patch, 1435.v1.patch
>
>
> With JVM reuse, TaskRunner.setupWorkDir() lists the contents of workDir and
> does a fs.delete on each path listed. If the listed file is a symlink to
> directory, it will delete the contents of those linked directories. This
> would delete files from distributed cache and jars directory,if
> mapred.create.symlink is true.
> Changing ownership/permissions of symlinks through ENABLE_TASK_FOR_CLEANUP
> would change ownership/permissions of underlying files.
> This is observed by Karam while running streaming jobs with DistributedCache
> and jvm reuse.
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