TaiJuWu commented on PR #16231:
URL: https://github.com/apache/kafka/pull/16231#issuecomment-2154228895

   > ```
   > MapBenchmark.testCopyOnWriteMap     avgt   15  3518087.394 ± 167618.482  
ns/op
   > MapBenchmark.testHashMap            avgt   15  3284793.930 ± 288361.593  
ns/op
   > ```
   > 
   > it seems `CopyOnWriteMap` is faster than `HashMap`?
   
   The benchmarl only test read part
   
   > ```
   > MapBenchmark.testCopyOnWriteMap     avgt   15  3518087.394 ± 167618.482  
ns/op
   > MapBenchmark.testHashMap            avgt   15  3284793.930 ± 288361.593  
ns/op
   > ```
   > 
   > it seems `CopyOnWriteMap` is faster than `HashMap`?
   
   Maybe this is statistical error?
   The benchmark only test read part but the benefit of `CopyOnWriteMap` is 
write part.


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