Abhay Kulkarni created RANGER-2839:
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             Summary: Assorted improvements for debugging and handling of 
thread terminations, clean-up of unused data, etc.
                 Key: RANGER-2839
                 URL: https://issues.apache.org/jira/browse/RANGER-2839
             Project: Ranger
          Issue Type: Bug
          Components: Ranger
    Affects Versions: master
            Reporter: Abhay Kulkarni
            Assignee: Abhay Kulkarni
             Fix For: master


These are various improvements/fixes needed for issues discovered during 
testing with incremental policy/delta enabled.

Highlights:
1. Threads are named for better debugging information.
2. super.join() call is made in a loop to ensure that thread is really 
terminated even in the face of spurious/out-of-sync interruptions.
3. preCleanup() call ensures that clean-up happens at least and exactly once, 
when incremental policy/tag feature is enabled.



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