Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18301
https://github.com/apache/spark/blob/fd1325522549937232f37215db53d6478f48644c/core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java#L473
In the a probe at L473, if the slot pointed by the hash code is not empty,
it's possible that there's hash collision (equal hash codes, different keys),
but it's possible too that the slot is occupied by a key with different hash
(the if condition at L475 is false). In this case, we continue to look up an
empty slot by going forward `step` at 492, and increase the number of probe.
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