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https://issues.apache.org/jira/browse/SPARK-9436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Ulanov updated SPARK-9436:
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Summary: Simplify Pregel by merging joins (was: Merge joins in Pregel )
> Simplify Pregel by merging joins
> --------------------------------
>
> Key: SPARK-9436
> URL: https://issues.apache.org/jira/browse/SPARK-9436
> Project: Spark
> Issue Type: Improvement
> Components: GraphX
> Affects Versions: 1.4.0
> Reporter: Alexander Ulanov
> Priority: Minor
> Fix For: 1.4.0
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> Pregel code contains two consecutive joins:
> ```
> g.vertices.innerJoin(messages)(vprog)
> ...
> g = g.outerJoinVertices(newVerts) { (vid, old, newOpt) =>
> newOpt.getOrElse(old) }
> ```
> They can be replaced by one join. Ankur Dave proposed a patch based on our
> discussion in mailing list:
> https://www.mail-archive.com/dev@spark.apache.org/msg10316.html
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