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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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Sean Owen resolved SPARK-2011.
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Resolution: Won't Fix
> 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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