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https://issues.apache.org/jira/browse/SPARK-4264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14199683#comment-14199683
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Apache Spark commented on SPARK-4264:
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User 'aarondav' has created a pull request for this issue:
https://github.com/apache/spark/pull/3128
> SQL HashJoin induces "refCnt = 0" error in ShuffleBlockFetcherIterator
> ----------------------------------------------------------------------
>
> Key: SPARK-4264
> URL: https://issues.apache.org/jira/browse/SPARK-4264
> Project: Spark
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Aaron Davidson
> Assignee: Aaron Davidson
> Priority: Blocker
>
> This is because it calls hasNext twice, which invokes the completion iterator
> twice, unintuitively.
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