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https://issues.apache.org/jira/browse/SPARK-27417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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yangpengyu closed SPARK-27417.
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> CLONE - ExternalSorter and ExternalAppendOnlyMap should free shuffle memory
> in their stop() methods
> ---------------------------------------------------------------------------------------------------
>
> Key: SPARK-27417
> URL: https://issues.apache.org/jira/browse/SPARK-27417
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.3.1, 1.4.1, 1.5.1, 1.6.0
> Reporter: yangpengyu
> Assignee: Josh Rosen
> Priority: Critical
> Fix For: 1.6.0
>
>
> I discovered multiple leaks of shuffle memory while working on my memory
> manager consolidation patch, which added the ability to do strict memory leak
> detection for the bookkeeping that used to be performed by the
> ShuffleMemoryManager. This uncovered a handful of places where tasks can
> acquire execution/shuffle memory but never release it, starving themselves of
> memory.
> Problems that I found:
> * {{ExternalSorter.stop()}} should release the sorter's shuffle/execution
> memory.
> * BlockStoreShuffleReader should call {{ExternalSorter.stop()}} using a
> {{CompletionIterator}}.
> * {{ExternalAppendOnlyMap}} exposes no equivalent of {{stop()}} for freeing
> its resources.
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