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https://issues.apache.org/jira/browse/SPARK-2011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ankur Dave updated SPARK-2011:
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    Priority: Minor  (was: Major)

> Eliminate duplicate join in Pregel
> ----------------------------------
>
>                 Key: SPARK-2011
>                 URL: https://issues.apache.org/jira/browse/SPARK-2011
>             Project: Spark
>          Issue Type: Improvement
>          Components: GraphX
>            Reporter: Ankur Dave
>            Assignee: Ankur Dave
>            Priority: Minor
>
> In the iteration loop, Pregel currently performs an innerJoin to apply 
> messages to vertices followed by an outerJoinVertices to join the resulting 
> subset of vertices back to the graph. These two operations could be merged 
> into a single call to joinVertices, which should be reimplemented in a more 
> efficient manner. This would allow us to examine only the vertices that 
> received messages.



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