Github user zhzhan commented on the issue: https://github.com/apache/spark/pull/18694 The memory leak happens on following scenario. For example, in inner join, the left side is exhausted, we will stop advance the right side. Because the right side is not reach the end, the memory hold will not be released, cannot be used by any other operator, for example, UnsafeShuffleWriter, causing more spills. Will locate the code logic in UnsafeExternalSorter that prevent the memory being released.
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