Github user uce commented on the pull request:
https://github.com/apache/flink/pull/2051#issuecomment-222554801
Hey Gyula!
The `QueryableStateStream` is only for convenience. It's just a creating a
`AbstractQueryableStateOperator`, which takes care of setting up an operator,
which consumes data and calls the `state.update()` or `state.add()` method
respectively.
You can use the `QueryableStateClient` anywhere you like, including your
map operator. Just be aware that further Threads will be started for the
network communication (configurable). You can share it between operators though.
You can make any `KvState` queryable by calling the `setQueryable(String)`
method of its state descriptor.
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