[GitHub] [incubator-druid] jihoonson opened a new pull request #8573: Stateful auto compaction

[GitBox <gi...@apache.org>]

jihoonson opened a new pull request #8573: Stateful auto compaction
URL: https://github.com/apache/incubator-druid/pull/8573
 
 
   Fixes #8489.
   
   ### Description
   
   In addition to #8489, `targetCompactionSizeBytes` is dropped for the compaction task and auto compaction. `targetCompactionSizeBytes` was added for easy configuration, but it could be a misleading that optimizing segments should be done in terms of the size rather than number of rows. Dropping `targetCompactionSizeBytes` also makes things simpler such that all tasks can share the same partitionsSpec since `targetCompactionSizeBytes` makes sense only for compaction task.
   `maxRowsPerSegment` now is a mandatory configuration for auto compaction. For compaction task, any partitionsSpec can be used.
   
   Also fixed a bug that auto compaction couldn't compact an interval if there is only one segment. Note that compaction can split a segment into smaller ones.
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added documentation for new or modified features or behaviors.
   - [x] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
   - [x] added unit tests or modified existing tests to cover new code paths.
   - [x] been tested in a test Druid cluster.

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