wsry opened a new pull request #15651:
URL: https://github.com/apache/flink/pull/15651


   ## What is the purpose of the change
   
   Currently, the data writing cache of sort-merge blocking shuffle is 8M, 
which can be not enough if data compression is enabled. This patch increases 
the cache size to 16M which can improve the performance for high compression 
ratio scenarios.
   
   ## Brief change log
   
     - Increase the data writing cache size of sort-merge blocking shuffle to 
16M.
   
   
   ## Verifying this change
   
   This change is already covered by existing tests.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** 
/ don't know)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** / 
don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (**not applicable** / docs / 
JavaDocs / not documented)
   


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