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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1435) symlinks in cwd of the task are not handled properly after MAPREDUCE-896
Date Mon, 01 Feb 2010 09:35:51 GMT
symlinks in cwd of the task are not handled properly after MAPREDUCE-896
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                 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
             Fix For: 0.22.0


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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