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https://issues.apache.org/jira/browse/SPARK-14390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-14390.
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Resolution: Incomplete
> Make initialization step in Pregel optional.
> --------------------------------------------
>
> Key: SPARK-14390
> URL: https://issues.apache.org/jira/browse/SPARK-14390
> Project: Spark
> Issue Type: Improvement
> Components: GraphX
> Affects Versions: 2.0.0
> Reporter: Anderson de Andrade
> Priority: Minor
> Labels: bulk-closed
>
> 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.
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