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https://issues.apache.org/jira/browse/SPARK-8373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14585634#comment-14585634
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Apache Spark commented on SPARK-8373:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/6826
> When an RDD has no partition, Python sum will throw "Can not reduce() empty
> RDD"
> --------------------------------------------------------------------------------
>
> Key: SPARK-8373
> URL: https://issues.apache.org/jira/browse/SPARK-8373
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Reporter: Shixiong Zhu
>
> The issue is because "sum" uses "reduce". Replacing it with "fold" will fix
> it.
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