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https://issues.apache.org/jira/browse/FLINK-1758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14512677#comment-14512677
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ASF GitHub Bot commented on FLINK-1758:
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Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/576#issuecomment-96271897
Hey @andralungu!
I see your point regarding `iterateOn...` and `reduce...`. Let's leave it
like this for now.
Only small thing that maybe I didn't explain well, is "operate directly on
the values" for the combinable versions. I meant there's no need to pass the
vertex keys at all.
This is a small change, I can make it before merging.
Otherwise, everything looks good, I'll merge right after #408. Thanks!
> Extend Gelly's neighborhood methods
> -----------------------------------
>
> Key: FLINK-1758
> URL: https://issues.apache.org/jira/browse/FLINK-1758
> Project: Flink
> Issue Type: Improvement
> Components: Gelly
> Affects Versions: 0.9
> Reporter: Vasia Kalavri
> Assignee: Andra Lungu
>
> Currently, the neighborhood methods only allow returning a single value per
> vertex. In many cases, it is desirable to return several or no value per
> vertex. This is the case in clustering coefficient computation,
> vertex-centric jaccard, algorithms where a vertex computes a value per edge
> or when a vertex computes a value only for some of its neighbors.
> This issue proposes to
> - change the current reduceOnEdges/reduceOnNeighbors methods to use
> combinable reduce operations where possible
> - provide groupReduce-versions, which will use a Collector and allow
> returning none or more values per vertex.
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