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Posted to issues@spark.apache.org by "liupengcheng (JIRA)" <ji...@apache.org> on 2019/01/03 09:25:00 UTC

[jira] [Created] (SPARK-26525) Fast release memory of ShuffleBlockFetcherIterator

liupengcheng created SPARK-26525:
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             Summary: Fast release memory of ShuffleBlockFetcherIterator
                 Key: SPARK-26525
                 URL: https://issues.apache.org/jira/browse/SPARK-26525
             Project: Spark
          Issue Type: Improvement
          Components: Shuffle
    Affects Versions: 2.3.2
            Reporter: liupengcheng


Currently, spark would not release ShuffleBlockFetcherIterator until the whole task finished.

In some conditions, it incurs memory leak.

An example is Shuffle -> map -> Coalesce(shuffle = false), each ShuffleMapTask will keep n(max to shuffle partitions) shuffleBlockFetcherIterator for they are refered by onCompleteCallbacks of TaskContext.

We can release ShuffleBlockFetcherIterator as soon as it's consumed.



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