ASF GitHub Bot commented on FLINK-4844:

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

    --- Diff: 
    @@ -18,14 +18,18 @@
     package org.apache.flink.api.common.state;
    +import org.apache.flink.annotation.PublicEvolving;
     import java.io.Serializable;
     import java.util.Set;
    - * Interface for a backend that manages operator state.
    + * This interface contains methods for registering operator state with a 
managed store.
     public interface OperatorStateStore {
    +   /** The default namespace for state in cases where no state name is 
provided */
        String DEFAULT_OPERATOR_STATE_NAME = "_default_";
    --- End diff --
    This is an implementation detail that should not be exposed on this 

> 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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