ASF GitHub Bot commented on FLINK-4844:

Github user aljoscha commented on a diff in the pull request:

    --- Diff: 
    @@ -48,7 +43,7 @@
      * {@link AbstractRichFunction#getRuntimeContext()}.
    -public interface RuntimeContext {
    +public interface RuntimeContext extends KeyedStateStore {
    --- End diff --
    I think it would be better to not have `RuntimeContext` be a 
`KeyedStateStore`. In the not-so-far future `RuntimeContext` will probably 
provide a `KeyedStateStore` or at least use one internally to implement the 
state methods. Properly separating the two now seems prudent.

> Partitionable Raw Keyed/Operator State
> --------------------------------------
>                 Key: FLINK-4844
>                 URL: https://issues.apache.org/jira/browse/FLINK-4844
>             Project: Flink
>          Issue Type: New Feature
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
> Partitionable operator and keyed state are currently only available by using 
> backends. However, the serialization code for many operators is build around 
> reading/writing their state to a stream for checkpointing. We want to provide 
> partitionable states also through streams, so that migrating existing 
> operators becomes more easy.

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