GitHub user avulanov opened a pull request:
https://github.com/apache/spark/pull/7749
[SPARK-9436] [GRAPHX] Pregel simplification patch
Pregel code contains two consecutive joins:
```
g.vertices.innerJoin(messages)(vprog)
...
g = g.outerJoinVertices(newVerts)
{ (vid, old, newOpt) => newOpt.getOrElse(old) }
```
This can be simplified with one join. @ankurdave proposed a patch based on
our discussion in the mailing list:
https://www.mail-archive.com/[email protected]/msg10316.html
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/avulanov/spark SPARK-9436-pregel
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/7749.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #7749
----
commit 8568e06e97f7862beb8b9589566aaa66c9f02708
Author: Alexander Ulanov <[email protected]>
Date: 2015-07-29T13:18:46Z
Pregel simplification patch
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