ASF GitHub Bot commented on FLINK-4844:

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

    --- Diff: 
    @@ -132,7 +133,7 @@ public DefaultOperatorStateBackend(ClassLoader 
userClassLoader) {
    -    * @see SnapshotProvider
    +    * @see Snapshotable
    --- End diff --
    I think an empty Javadoc does simply prevent tools from displaying the 
Javadoc of the overridden method so it's probably best to remove those. There 
are also more instances of that in this file.

> 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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