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https://issues.apache.org/jira/browse/FLINK-1758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499854#comment-14499854
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ASF GitHub Bot commented on FLINK-1758:
---------------------------------------
Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/576#discussion_r28595115
--- Diff:
flink-staging/flink-gelly/src/main/java/org/apache/flink/graph/EdgeDirection.java
---
@@ -20,10 +20,10 @@
/**
* The EdgeDirection is used to select a node's neighborhood
- * by the {@link Graph#reduceOnEdges(EdgesFunction, EdgeDirection)},
- * {@link Graph#reduceOnEdges(EdgesFunctionWithVertexValue,
EdgeDirection)},
- * {@link Graph#reduceOnNeighbors(NeighborsFunction, EdgeDirection)} and
- * {@link Graph#reduceOnNeighbors(NeighborsFunctionWithVertexValue,
EdgeDirection)}
+ * by the {@link Graph#groupReduceOnEdges(EdgesFunction, EdgeDirection)},
--- End diff --
isn't it used in both cases?
> 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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