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https://issues.apache.org/jira/browse/SPARK-28751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean R. Owen resolved SPARK-28751.
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Resolution: Won't Fix
See PR
> Imporve java serializer deserialization performance
> ---------------------------------------------------
>
> Key: SPARK-28751
> URL: https://issues.apache.org/jira/browse/SPARK-28751
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Xianyang Liu
> Priority: Major
>
> 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.
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