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https://issues.apache.org/jira/browse/APEXMALHAR-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15508172#comment-15508172
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ASF GitHub Bot commented on APEXMALHAR-2130:
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Github user davidyan74 closed the pull request at:
https://github.com/apache/apex-malhar/pull/405
> 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
>
> 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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