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https://issues.apache.org/jira/browse/SPARK-6667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14393023#comment-14393023
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Josh Rosen commented on SPARK-6667:
-----------------------------------
This patch introduced a rare bug that can cause a hang while calling
{{collect()}} (SPARK-6194); I'm commenting here so we remember to put the fix
into the correct branches.
> hang while collect in PySpark
> -----------------------------
>
> Key: SPARK-6667
> URL: https://issues.apache.org/jira/browse/SPARK-6667
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 1.3.1, 1.4.0
> Reporter: Davies Liu
> Assignee: Davies Liu
> Priority: Critical
>
> PySpark tests hang while collecting:
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