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https://issues.apache.org/jira/browse/SPARK-4086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14362106#comment-14362106
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Brennon York commented on SPARK-4086:
-------------------------------------

Hey [~ankurd] could you go into a little more detail about what methods you're 
actually thinking about here? Are you thinking we add a series of methods (like 
{{innerFoldJoin}}, {{leftFoldJoin}}, etc.) or modifying the existing methods to 
optionally take an additional parameter and act more like the fold operations?

> 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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