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https://issues.apache.org/jira/browse/SPARK-21492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095425#comment-16095425
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Zhan Zhang commented on SPARK-21492:
------------------------------------
root cause: In the SortMergeJoin, inner/leftOuter/rightOuter, one side of the
SortedIter may not exhausted, that chunk of the memory thus cannot be released,
causing memory leak and performance degradtion.
> Memory leak in SortMergeJoin
> ----------------------------
>
> Key: SPARK-21492
> URL: https://issues.apache.org/jira/browse/SPARK-21492
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Zhan Zhang
>
> In SortMergeJoin, if the iterator is not exhausted, there will be memory leak
> caused by the Sort. The memory is not released until the task end, and cannot
> be used by other operators causing performance drop or OOM.
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