[jira] [Created] (FLINK-3618) Rename abstract UDF classes in Scatter-Gather implementation

[Shang Yuanchun (Jira)]

Martin Junghanns created FLINK-3618:
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             Summary: Rename abstract UDF classes in Scatter-Gather implementation
                 Key: FLINK-3618
                 URL: https://issues.apache.org/jira/browse/FLINK-3618
             Project: Flink
          Issue Type: Improvement
          Components: Gelly
    Affects Versions: 1.1.0, 1.0.1
            Reporter: Martin Junghanns
            Priority: Minor


We now offer three Vertex-centric computing abstractions:
* Pregel
* Gather-Sum-Apply
* Scatter-Gather

Each of these abstractions provides abstract classes that need to be implemented by the user:
* Pregel: {{ComputeFunction}}
* GSA: {{GatherFunction}}, {{SumFunction}}, {{ApplyFunction}}
* Scatter-Gather: {{MessagingFunction}}, {{VertexUpdateFunction}}

In Pregel and GSA, the names of those functions follow the name of the abstraction or the name suggested in the corresponding papers. For consistency of the API, I propose to rename {{MessageFunction}} to {{ScatterFunction}} and {{VertexUpdateFunction}} to {{GatherFunction}}.

Also for consistency, I would like to change the parameter order in {{Graph.runScatterGatherIteration(VertexUpdateFunction f1, MessagingFunction f2}} to  {{Graph.runScatterGatherIteration(ScatterFunction f1, GatherFunction f2}} (like in {{Graph.runGatherSumApplyFunction(...)}})



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