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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-3200) Use Partitioned State Abstraction in WindowOperator
Date Tue, 05 Jan 2016 11:18:40 GMT
Aljoscha Krettek created FLINK-3200:

             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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