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https://issues.apache.org/jira/browse/FLINK-1523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14501357#comment-14501357
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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_r28644051
--- Diff:
flink-staging/flink-gelly/src/main/java/org/apache/flink/graph/spargel/MessagingFunction.java
---
@@ -38,25 +42,57 @@
* @param <Message> The type of the message sent between vertices along
the edges.
* @param <EdgeValue> The type of the values that are associated with the
edges.
*/
-public abstract class MessagingFunction<VertexKey extends
Comparable<VertexKey> & Serializable,
- VertexValue extends Serializable, Message, EdgeValue extends
Serializable> implements Serializable {
+public abstract class MessagingFunction<VertexKey extends
Comparable<VertexKey> & Serializable,
+ VertexValue extends Serializable, Message, EdgeValue extends
Serializable> implements Serializable {
private static final long serialVersionUID = 1L;
-
+
+ //
--------------------------------------------------------------------------------------------
+ // Attributes that allow vertices to access their in/out degrees and
the total number of vertices
+ // inside an iteration.
+ //
--------------------------------------------------------------------------------------------
+
+ private long numberOfVertices = -1L;
+
+ public long getNumberOfVertices() throws Exception{
+ if (numberOfVertices == -1) {
+ throw new InaccessibleMethodException("The number of
vertices option is not set");
--- End diff --
Can we make the error message a bit more informative? i.e. explain how to
set the option?
> 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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