Github user yhuai commented on the pull request: https://github.com/apache/spark/pull/8362#issuecomment-148227211 Thanks for the pointer. Looks like we only have 32-bit Murmur3 in spark's unsafe module (https://github.com/apache/spark/blob/master/unsafe/src/main/java/org/apache/spark/unsafe/hash/Murmur3_x86_32.java).
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