cloud-fan commented on issue #23284: [SPARK-26337][SQL][TEST] Add benchmark for LongToUnsafeRowMap URL: https://github.com/apache/spark/pull/23284#issuecomment-446250046 BTW I think this proves that, in Java if `long` is accessed by multiple threads, it will cause perf problems even without lock. Maybe it's related to memory barrier. cc @kiszk @dongjoon-hyun @JkSelf
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