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https://issues.apache.org/jira/browse/SPARK-4086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14362192#comment-14362192
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Takeshi Yamamuro commented on SPARK-4086:
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ISTM, VertexRDD has to comply with PairRDDFunctions interfaces, so the former
is better.
> Fold-style aggregation for VertexRDD
> ------------------------------------
>
> Key: SPARK-4086
> URL: https://issues.apache.org/jira/browse/SPARK-4086
> Project: Spark
> Issue Type: Improvement
> Components: GraphX
> Reporter: Ankur Dave
> Assignee: Ankur Dave
>
> VertexRDD currently supports creations and joins only through a reduce-style
> interface where the user specifies how to merge two conflicting values. We
> should also support a fold-style interface that takes a default value
> (possibly of a different type than the input collection) and a fold function
> specifying how to accumulate values.
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