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https://issues.apache.org/jira/browse/FLINK-1514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14371390#comment-14371390
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ASF GitHub Bot commented on FLINK-1514:
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Github user balidani commented on the pull request:
https://github.com/apache/flink/pull/408#issuecomment-84033474
@vasia was completely right about the GGC algorithm, I misunderstood what
it was supposed to do. I implemented the correct version, but it turns out,
after reading the GAS paper that this algorithm has problems when executed
synchronously (e.g., values can oscillate between 0 and 1). We had a discussion
and decided to add a Connected Components example instead, as well as a
PageRank example, which I will implement shortly.
> [Gelly] Add a Gather-Sum-Apply iteration method
> -----------------------------------------------
>
> Key: FLINK-1514
> URL: https://issues.apache.org/jira/browse/FLINK-1514
> Project: Flink
> Issue Type: New Feature
> Components: Gelly
> Affects Versions: 0.9
> Reporter: Vasia Kalavri
> Assignee: Daniel Bali
>
> This will be a method that implements the GAS computation model, but without
> the "scatter" step. The phases can be mapped into the following steps inside
> a delta iteration:
> gather: a map on each < srcVertex, edge, trgVertex > that produces a partial
> value
> sum: a reduce that combines the partial values
> apply: join with vertex set to update the vertex values using the results of
> sum and the previous state.
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