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https://issues.apache.org/jira/browse/HIVE-26674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17631604#comment-17631604
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László Bodor commented on HIVE-26674:
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please add details into jira description about what REBALANCE compaction
exactly is, thanks! (PR description points to this ticket btw :) )
> REBALANCE type compaction
> -------------------------
>
> Key: HIVE-26674
> URL: https://issues.apache.org/jira/browse/HIVE-26674
> Project: Hive
> Issue Type: Improvement
> Reporter: László Végh
> Assignee: László Végh
> Priority: Major
> Labels: compaction
>
> A new compaction type is required for implicitly bucketed tables. These
> tables can have balancing issues over time, in a way that the first few
> buckets contain the majority of the data, while the buckets with higher index
> contain less and less data. As a result, query performance will drop over
> time on these unbalanced tables. To solve this issue, the data periodically
> needs to be re-balanced among the buckets. The plain is to do this via a new
> RE-BALANCING compaction. This compaction can be issued either manually by
> users, or automatically by the Initiator. The automatic re-balancing
> compaction must be based on evaluating a set of thresholds.
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