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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APEXMALHAR-2130) Scalable windowed storage
Date Thu, 22 Sep 2016 22:41:20 GMT

    [ https://issues.apache.org/jira/browse/APEXMALHAR-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514686#comment-15514686
] 

ASF GitHub Bot commented on APEXMALHAR-2130:
--------------------------------------------

Github user davidyan74 closed the pull request at:

    https://github.com/apache/apex-malhar/pull/345


> 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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