Eugene Koifman created HIVE-18773:

             Summary: Support multiple instances of Cleaner
                 Key: HIVE-18773
             Project: Hive
          Issue Type: Improvement
          Components: Transactions
            Reporter: Eugene Koifman

We support multiple Workers by making each Worker update the status of the 
entry in COMPACTION_QUEUE to make sure only 1 worker grabs it.  Once we have 
HIVE-18772, Cleaner should not need any state we can easily have  > 1 Cleaner 
instance by introducing 1 more status type "being cleaned".

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