Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/210#issuecomment-63452925
I think executing right away makes sense, because we need the `long` value
or the `List<T>` immediately. This is a new type of methods, where you fetch
back data to the driver program.
As for IDs, I agree that a random generated ID per method makes sense.
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