Github user greghogan commented on the pull request:
https://github.com/apache/flink/pull/1900#issuecomment-215167381
The switch to `MapFunction` means that a user can use a `RichMapFunction`
with open, close, accumulators, etc.
Rather than add six new methods to `Graph` I implemented these with three
`GraphAlgorithm` which use the Gellyish `Graph.run(GraphAlgorithm)`
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