[jira] [Commented] (FLINK-3761) Refactor State Backends/Make Keyed State Key-Group Aware

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15454935#comment-15454935 ] 

ASF GitHub Bot commented on FLINK-3761:
---------------------------------------

Github user tillrohrmann commented on the issue:

    https://github.com/apache/flink/pull/1988
  
    Yes will close the PR because it has been subsumed by #2440.


> Refactor State Backends/Make Keyed State Key-Group Aware
> --------------------------------------------------------
>
>                 Key: FLINK-3761
>                 URL: https://issues.apache.org/jira/browse/FLINK-3761
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>            Reporter: Till Rohrmann
>            Assignee: Aljoscha Krettek
>             Fix For: 1.2.0
>
>
> After an off-line discussion with [~aljoscha], we came to the conclusion that it would be beneficial to reflect the differences between a keyed and a non-keyed stream also in the state backends. A state backend which is used for a keyed stream offers a value, list, folding and value state and has to group its keys into key groups. 
> A state backend for non-keyed streams can only offer a union state to make it work with dynamic scaling. A union state is a state which is broadcasted to all tasks in case of a recovery. The state backends can then select what information they need to recover from the whole state (formerly distributed).



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