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Review request for hive, Carl Steinbach and Ashutosh Chauhan.


Description
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Hive uses ZK for locking. In some test cases, ZK is not behaving well. In 
thread dumps, I saw it is waiting for locks to be released but they were not 
getting released. Hive tries to release locks but keeps failing, it eventually 
times out for its release attempts, which in default settings takes 10 mins. 
This is also the cause of why some queries take extra-ordinarily long to run. I 
suggest to disable ZK locking till ZK is certified for windows.In this test 
case, I don’t see a requirement to use ZK so I am disabling the 
HiveConf.ConfVars.HIVE_SUPPORT_CONCURRENCY to work around the issue.


This addresses bug HIVE_3659.
    https://issues.apache.org/jira/browse/HIVE_3659


Diffs
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  trunk/ql/src/test/org/apache/hadoop/hive/ql/history/TestHiveHistory.java 
1405070 

Diff: https://reviews.apache.org/r/7835/diff/


Testing
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Thanks,

Kanna Karanam

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