Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/537#discussion_r28643290
--- 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.
+
--- End diff --
delete this newline
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