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

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-2676:
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             Summary: 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
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 0.10


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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