Thomas Weise updated APEXMALHAR-2130:
    Labels: roadmap  (was: )

> implement scalable windowed storage
> -----------------------------------
>                 Key: APEXMALHAR-2130
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-2130
>             Project: Apache Apex Malhar
>          Issue Type: Task
>            Reporter: bright chen
>            Assignee: David Yan
>              Labels: roadmap
> This feature is used for supporting windowing.
> The storage needs to have the following features:
> 1. Spillable key value storage (integrate with APEXMALHAR-2026)
> 2. Upon checkpoint, it saves a snapshot for the entire data set with the 
> checkpointing window id.  This should be done incrementally (ManagedState) to 
> avoid wasting space with unchanged data
> 3. When recovering, it takes the recovery window id and restores to that 
> snapshot
> 4. When a window is committed, all windows with a lower ID should be purged 
> from the store.
> 5. It should implement the WindowedStorage and WindowedKeyedStorage 
> interfaces, and because of 2 and 3, we may want to add methods to the 
> WindowedStorage interface so that the implementation of WindowedOperator can 
> notify the storage of checkpointing, recovering and committing of a window.

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