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https://issues.apache.org/jira/browse/HIVE-18709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466660#comment-16466660
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Eugene Koifman commented on HIVE-18709:
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with query based compactor this may be easy
> 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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