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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1758) Extend Gelly's neighborhood methods
Date Sat, 25 Apr 2015 19:55:38 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14512677#comment-14512677
] 

ASF GitHub Bot commented on FLINK-1758:
---------------------------------------

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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