ConeyLiu removed a comment on issue #25470: [SPARK-28751][Core][WIP] Improve java serializer deserialization performance URL: https://github.com/apache/spark/pull/25470#issuecomment-546806343 I tested simply: `./spark-shell --executor-cores 36 --executor-memory 120G --total-executor-cores 144` `val start = System.currentTimeMillis(); rdd1.map(_.to); System.currentTimeMillis() - start` results: | | true(ms) | false(ms) | |-----|-------|-------| | 0 | 81326 | 82970 | | 1 | 76379 | 77856 | | 2 | 75739 | 77435 | | avg | 77814 | 79420 | The overall improvement is only about 2%.
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