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https://issues.apache.org/jira/browse/SPARK-8373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14585884#comment-14585884
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Sean Owen commented on SPARK-8373:
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Really the same as SPARK-6878
https://github.com/apache/spark/commit/51b306b930cfe03ad21af72a3a6ef31e6e626235
> 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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