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?
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