[jira] [Created] (SPARK-27417) CLONE - ExternalSorter and ExternalAppendOnlyMap should free shuffle memory in their stop() methods

["yangpengyu (JIRA)" <ji...@apache.org>]

yangpengyu created SPARK-27417:
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             Summary: 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
             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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