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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