Alexander Ulanov created SPARK-9436:
---------------------------------------
Summary: Merge joins in Pregel
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
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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