[jira] [Created] (FLINK-3200) Use Partitioned State Abstraction in WindowOperator

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3200:
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             Summary: Use Partitioned State Abstraction in WindowOperator
                 Key: FLINK-3200
                 URL: https://issues.apache.org/jira/browse/FLINK-3200
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
    Affects Versions: 1.0.0
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek


Right now, the WindowOperator uses snapshotState and restoreState to do custom serialization/deserialization of the windowing state. Moving this to partitioned state would allow us to re-scale in the future. Also, once the partitioned state has support to run on ManagedMemory/Out-of-core state the WindowOperator would also automatically benefit from this, allowing very large windows and large window state.

The necessary steps are these:
- Enhance state interface with new primitive states: ReducableState, ListState, etc.. Also make state scoped to a namespace. Namespaces are necessary because we need state that is scoped by key and by window (window would be the namespace in this case)
- Enhance timer interface to also make timers scoped to a key/namespace
- Change WindowOperator to use these new interfaces



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