[jira] [Commented] (FLINK-2676) Add abstraction for keyed window state

["Stephan Ewen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15008622#comment-15008622 ] 

Stephan Ewen commented on FLINK-2676:
-------------------------------------

Approach changed a bit. Will file a more detailed followup at some point.

> Add abstraction for keyed window state
> --------------------------------------
>
>                 Key: FLINK-2676
>                 URL: https://issues.apache.org/jira/browse/FLINK-2676
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Streaming
>    Affects Versions: 0.10.0
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>             Fix For: 1.0.0
>
>
> This abstraction should help to seamlessly switch between window state kept as
>   - Heap-resident maps
>   - Managed memory spillable maps
>   - key/value state backend state
> I would approach this abstraction once we implemented a few window operators and see what operations we need, such as
>   - Drop time-regions across all keys
>   - Append to state for key
>   - Update/replace state by key
>   - Iterate over unions of multiple state time regions
>   - snapshot time regions completely / incrementally
>   - (possibly more)



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