Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/600#issuecomment-94175152
I like it that you are using the example to show the migration process, but
I think it would also be helpful to add a section with more general guidelines,
describing all the differences between Spargel and Gelly.
Among others possibly, we should cover the following:
- Gelly has Vertex and Edge type whereas Spargel operates on Tuple2 and
Tuple3
- Spargel has separate methods for edges with values and edges without
values. In Gelly, there is only one. Edges without values have a NullValue type.
- Spargel's `runOperation` vs. Gelly's `runVertexCentricIteration`
- Spargel's `OutgoingEdge` type is replaced by `Edge` in Gelly.
- How an iteration is configured in each of the APIs.
- Spargel's record API is completely removed from Gelly.
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