Matt Massie created SPARK-8454:
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             Summary: Update ShuffleBlockFetcherIterator.next to close previous 
stream when returning a new one
                 Key: SPARK-8454
                 URL: https://issues.apache.org/jira/browse/SPARK-8454
             Project: Spark
          Issue Type: Improvement
          Components: Block Manager
            Reporter: Matt Massie


For context, see the PR comments at 
https://github.com/apache/spark/pull/6423#discussion_r31370774

The current HashShuffleReader closes the input stream when all records have 
been read by using a NextIterator. However, we want the 
ShuffleBlockFetcherIterator to be more defensive about closing files and 
releasing memory to protect against other ShuffleReaders which may not.



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