Alexander Kolbasov created HIVE-18888:

             Summary: Replace synchronizedMap with ConcurrentHashMap
                 Key: HIVE-18888
             Project: Hive
          Issue Type: Bug
          Components: Hive
    Affects Versions: 3.0.0, 2.3.3
            Reporter: Alexander Kolbasov
            Assignee: Alexander Kolbasov

There are a bunch of places that use Collections.synchronizedMap instead of 
ConcurrentHashMap which are better. We should search/replace the uses.

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