[PR] KAFKA-14484: Move UnifiedLog to storage module [kafka]

[via GitHub]

mimaison opened a new pull request, #19030:
URL: https://github.com/apache/kafka/pull/19030

   Benchmarks:
   
   - ReplicaFetcherThreadBenchmark
     - trunk
       ```
       Benchmark                                  (partitionCount)  Mode  Cnt   
    Score      Error  Units
       ReplicaFetcherThreadBenchmark.testFetcher               100  avgt   15   
 6304.413 ±   18.903  ns/op
       ReplicaFetcherThreadBenchmark.testFetcher               500  avgt   15   
36740.067 ±   91.364  ns/op
       ReplicaFetcherThreadBenchmark.testFetcher              1000  avgt   15   
76923.929 ±  268.632  ns/op
       ReplicaFetcherThreadBenchmark.testFetcher              5000  avgt   15  
482229.504 ± 1473.677  ns/op
       ```
     - branch
     
       ```
       Benchmark                                  (partitionCount)  Mode  Cnt   
    Score      Error  Units
       ReplicaFetcherThreadBenchmark.testFetcher               100  avgt   15   
 5904.968 ±   30.470  ns/op
       ReplicaFetcherThreadBenchmark.testFetcher               500  avgt   15   
37119.817 ±  201.978  ns/op
       ReplicaFetcherThreadBenchmark.testFetcher              1000  avgt   15   
73698.662 ±  353.710  ns/op
       ReplicaFetcherThreadBenchmark.testFetcher              5000  avgt   15  
437040.285 ± 1692.574  ns/op
       ```
   
   ### 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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