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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3761) Refactor State Backends/Make Keyed State Key-Group Aware
Date Thu, 01 Sep 2016 09:51:21 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15454934#comment-15454934
] 

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

Github user tillrohrmann closed the pull request at:

    https://github.com/apache/flink/pull/1988


> 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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