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https://issues.apache.org/jira/browse/SPARK-8373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Or updated SPARK-8373:
-----------------------------
    Affects Version/s: 1.4.0

> 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
>    Affects Versions: 1.4.0
>            Reporter: Shixiong Zhu
>            Priority: Minor
>
> The issue is because "sum" uses "reduce". Replacing it with "fold" will fix 
> it.



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