Eugene Koifman reassigned HIVE-18709:

> Enable Compaction to work on more than one partition per job
> ------------------------------------------------------------
>                 Key: HIVE-18709
>                 URL: https://issues.apache.org/jira/browse/HIVE-18709
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>    Affects Versions: 1.0.0
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Major
> 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 
> partitions.  

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