Github user senorcarbone commented on the pull request:
https://github.com/apache/flink/pull/747#issuecomment-114180337
We have added a `KeyedDataStream` type to the API as you can see in the
last commit. It is basically a supertype of `GroupDataStream` and represents a
`DataStream` with partitioned operator state by a given key. To create a
`KeyedDataStream` one has to call `keyBy(...)` on a `DataStream`. Mind that no
further repartitioning is allowed on a `KeyedDataStream` so all `shuffle,
groupBy, forward...`methods will throw an exception when a user calls them.
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