ConeyLiu commented on issue #25470: [SPARK-28751][Core][WIP] Improve java serializer deserialization performance URL: https://github.com/apache/spark/pull/25470#issuecomment-525296971 This found in the RPC module which uses java serializer. Not sure why can't configure with `Kryo`. And there is some overhead of initializing Kryo in the previous version, and it has fixed in the master branch.
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