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https://issues.apache.org/jira/browse/SPARK-30432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-30432:
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Assignee: Apache Spark
> reduce degree recomputation in StronglyConnectedComponents
> ----------------------------------------------------------
>
> Key: SPARK-30432
> URL: https://issues.apache.org/jira/browse/SPARK-30432
> Project: Spark
> Issue Type: Improvement
> Components: GraphX
> Affects Versions: 3.1.0
> Reporter: xiaosen
> Assignee: Apache Spark
> Priority: Major
>
>
> So the computation happens every time in the do-while loop, the first time
> the outer while loop executes. although just once per do-while loop after, it
> seems, but It does reduce a lot of recomputation；because every time it jump
> out of the do-while loop，there are no vertices have only out-degree or
> in-degree，so it's no need to recompute degree to tag the vertices true.
> I have done a small code proposal, because there is a problem when the pregel
> executions have done, the degree no need to be recomputed.
>
> for example，the Email-EuAll data
> set：[http://snap.stanford.edu/data/email-EuAll.html]
> do-while loop execute 10 times，and the reduce logic happend 2 times；so it
> would be helpful when computing StronglyConnectedComponents to reduce degree
> computation.
>
> I created a branch in my fork:
> [https://github.com/xs-li/spark/blob/master/graphx/src/main/scala/org/apache/spark/graphx/lib/StronglyConnectedComponents.scala]
>
> I hope you can consider this small code proposal.
> Thank you very much,
> Best regards,
> xs-li
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