[GitHub] [spark] ConeyLiu opened a new pull request #25470: [SPARK-28751][Core] Imporve java serializer deserialization performance

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

ConeyLiu opened a new pull request #25470: [SPARK-28751][Core] Imporve java serializer deserialization performance
URL: https://github.com/apache/spark/pull/25470
 
 
   ### What changes were proposed in this pull request?
   
   Improve the performance of java serializer deserialization by caching the resolved class. Java serializer is used in many places: closure, RPC and others. This change could improve the performance of deserialization 1.3X ~ 1.5X.  Especially for java primitive instances. 
   
   And also, add new UT tests and benchmarks case.
   
   ### Why are the changes needed?
   
   This change could improve the performance of deserialization 1.3X ~ 1.5X.  Especially for java primitive instances. 
   
   
   ### Does this PR introduce any user-facing change?
   
   Add new config to enable disable this feature, default is true. This shouldn't influence the existed code.
   
   
   ### How was this patch tested?
   New UT tests.
   

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