[jira] [Updated] (SPARK-9436) Simplify Pregel by merging joins

["Alexander Ulanov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-9436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexander Ulanov updated SPARK-9436:
------------------------------------
    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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