viirya commented on issue #25953: [SPARK-29244][Core] Prevent freed page in BytesToBytesMap free again URL: https://github.com/apache/spark/pull/25953#issuecomment-536233734 @JoshRosen I have tried to have a single-threaded test on BytesToBytesMap. But seems it might not be possible. It is because when initializing BytesToBytesMap, it will allocate initialCapacity memory. That says when call reset on it, if there is no other memory consumer to allocate memory at the same time, BytesToBytesMap will be sure to allocate back initialCapacity memory it just released, so it never hits OOM in this case.
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