vcrfxia opened a new pull request, #13431:
URL: https://github.com/apache/kafka/pull/13431

   The RocksDB-based versioned store implementation introduced in 
https://github.com/apache/kafka/pull/13188 currently uses two physical RocksDB 
instances per store instance: one for the "latest value store" and another for 
the "segments store." This PR combines those two RocksDB instances into one by 
representing the latest value store as a special "reserved" segment within the 
segments store. This reserved segment has segment ID -1, is never expired, and 
is not included in the regular `Segments` methods for getting or creating 
segments, but is represented in the physical RocksDB instance the same way as 
any other segment.
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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