Eugene Koifman created HIVE-18709:

             Summary: Enable Compaction to work on more than one partition per 
                 Key: HIVE-18709
             Project: Hive
          Issue Type: Improvement
          Components: Transactions
    Affects Versions: 1.0.0
            Reporter: Eugene Koifman
            Assignee: Eugene Koifman

currently compaction launches 1 MR job per partition that needs to be compacted.
The number of tasks is equal to the number of buckets in the table (or number 
or writers in the 'widest' write).
The number of AMs in a cluster is usually limited to a small percentage of the 
nodes.  This limits how much compaction can be done in parallel.

Investigate what it would take for a single job to be able to handle multiple 

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