[jira] [Created] (FLINK-2140) Access the number of vertices from within the GSA functions

[Shang Yuanchun (Jira)]

Andra Lungu created FLINK-2140:
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             Summary: Access the number of vertices from within the GSA functions
                 Key: FLINK-2140
                 URL: https://issues.apache.org/jira/browse/FLINK-2140
             Project: Flink
          Issue Type: New Feature
          Components: Gelly
    Affects Versions: 0.9
            Reporter: Andra Lungu


Similarly to the Vertex-centric approach we would like to allow the user to access the number of vertices from the Gather, Sum and Apply functions respectively. This property will become available by setting [setOptNumVertices()] the numVertices option to true.

The number of vertices can then be accessed in the gather, sum and apply functions using the getNumberOfVertices() method. If the option is not set in the configuration, this method will return -1.



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