GitHub user adeandrade opened a pull request:
https://github.com/apache/spark/pull/12302
[SPARK-14390][GraphX] Make initialization step in Pregel optional.
## What changes were proposed in this pull request?
Suppose a sendMsg function depends on the state of a edge's vertices to
send messages, and those Pregel messages update such state. In this scenario,
initialMsg will initially enforce the same message on all vertices, effectively
removing a custom initialization one may have per vertex.
To deal with this situation, we must define a dummy initMsg (i.e. None),
and all Pregel functions must be modified to handle this type of message. A
simpler and less cumbersome solution is to make initMsg and the initialization
step in Pregel optional.
## How was this patch tested?
No new tests were added. Some tests were updated. Previous functionality
was kept.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/adeandrade/spark pregel-optional-initmessage
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12302.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 #12302
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commit dd9123d7b55d0b43651f3dd089c684eb82c9a776
Author: Anderson de Andrade <adeandr...@verticalscope.com>
Date: 2016-04-11T17:20:39Z
Make initialization step in Pregel optional.
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