srowen commented on issue #23284: [SPARK-26337][SQL][TEST] Add benchmark for LongToUnsafeRowMap URL: https://github.com/apache/spark/pull/23284#issuecomment-446347640 There's no good reason why 64-bit reads/writes shouldn't be atomic on a 64-bit machine, and I assume everything we're testing on is 64-bit these days. It was an issue in the past, and yes as you note, the JLS seems to allow for it to be implementation-specific. No idea...
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