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https://issues.apache.org/jira/browse/FLINK-1523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14501275#comment-14501275
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ASF GitHub Bot commented on FLINK-1523:
---------------------------------------
Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/537#discussion_r28643293
--- Diff: docs/gelly_guide.md ---
@@ -380,6 +380,16 @@ all aggregates globally once per superstep and makes
them available in the next
* <strong>Broadcast Variables</strong>: DataSets can be added as
[Broadcast Variables](programming_guide.html#broadcast-variables) to the
`VertexUpdateFunction` and `MessagingFunction`, using the
`addBroadcastSetForUpdateFunction()` and
`addBroadcastSetForMessagingFunction()` methods, respectively.
+* <strong>Number of Vertices</strong>: Accessing the total number of
vertices within the iteration. This property can be set using the
`setOptNumVertices()` method.
+
+The number of vertices can then be accessed in the vertex update function
and in the messaging function using the `getNumberOfVertices()` method.
+
+* <strong>Degrees</strong>: Accessing the in/out degree for a vertex
within an iteration. This property can be set using the `setOptDegrees()`
method.
+
--- End diff --
same
> Vertex-centric iteration extensions
> -----------------------------------
>
> Key: FLINK-1523
> URL: https://issues.apache.org/jira/browse/FLINK-1523
> Project: Flink
> Issue Type: Improvement
> Components: Gelly
> Reporter: Vasia Kalavri
> Assignee: Andra Lungu
>
> We would like to make the following extensions to the vertex-centric
> iterations of Gelly:
> - allow vertices to access their in/out degrees and the total number of
> vertices of the graph, inside the iteration.
> - allow choosing the neighborhood type (in/out/all) over which to run the
> vertex-centric iteration. Now, the model uses the updates of the in-neighbors
> to calculate state and send messages to out-neighbors. We could add a
> parameter with value "in/out/all" to the {{VertexUpdateFunction}} and
> {{MessagingFunction}}, that would indicate the type of neighborhood.
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