[jira] [Created] (FLINK-2857) Gelly API improvements

[Shang Yuanchun (Jira)]

Vasia Kalavri created FLINK-2857:
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             Summary: Gelly API improvements
                 Key: FLINK-2857
                 URL: https://issues.apache.org/jira/browse/FLINK-2857
             Project: Flink
          Issue Type: Improvement
          Components: Gelly
            Reporter: Vasia Kalavri


During the Flink Forward Gelly School training, I got some really valuable feedback from participants on what they found hard to grasp or non-intuitive in the API.

Based on that, I propose we make the following improvements:
-  rename the mapper in creation methods to {{VertexInitializer}}, so that its purpose is easier to understand.
- add a {{fromTuple2DataSet}} method to easily create graphs from {{Tuple2}} datasets, i.e. edges with no values.
- in {{joinWith*}} methods, it is hard to understand what are the parameters in the mapper and what will be the output. I suggest we flatten them, try to give intuitive names and improve the javadocs.
- in neighborhood methods, it is hard to understand what are the arguments of the {{EdgeFunction.iterateEdges}} and {{ReduceEdgesFunction.reduceEdges}}. Javadocs and parameter names could be improved here too.



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