Github user shixiaogang commented on the issue:
https://github.com/apache/flink/pull/2768
@aljoscha That way, it's very confusing that a `ReadableState` is not a
`State`. Hence I made `State` read-only and introduced the `UpdatableState`
interface who extends `State` with the method `clear()`.
These changes (mainly the introduction of the `get()` method) are intended
to remove the duplicated code. As they have little relationship with the
implementation of map states. I think it's okay not to change these interfaces
now.
But I prefer to rethink the state hierarchy in the near future because
there exists too much duplicated code now.
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