Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/21102#discussion_r203314045 --- Diff: core/src/main/scala/org/apache/spark/util/collection/OpenHashSet.scala --- @@ -163,7 +187,7 @@ class OpenHashSet[@specialized(Long, Int) T: ClassTag]( * to a new position (in the new data array). */ def rehashIfNeeded(k: T, allocateFunc: (Int) => Unit, moveFunc: (Int, Int) => Unit) { - if (_size > _growThreshold) { + if (_occupied > _growThreshold) { --- End diff -- I dont see any value in _occupied - on contrary it can cause very bad behavior if there is a lot of remove's expected. `_size` is a better metric to decide to rehash and grow.
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