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From "Kenneth Knowles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-1261) State API should allow state to be managed in different windows
Date Thu, 23 Mar 2017 04:56:41 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937725#comment-15937725
] 

Kenneth Knowles commented on BEAM-1261:
---------------------------------------

This is an interesting model idea somewhat related to WindowMappingFn. I think we should first
gain familiarity with both of those before tackling this, so I am going to set to unassigned.

> State API should allow state to be managed in different windows
> ---------------------------------------------------------------
>
>                 Key: BEAM-1261
>                 URL: https://issues.apache.org/jira/browse/BEAM-1261
>             Project: Beam
>          Issue Type: New Feature
>          Components: beam-model, sdk-java-core
>            Reporter: Ben Chambers
>            Assignee: Kenneth Knowles
>
> For example, even if the elements are being processed in fixed windows of an hour, it
may be desirable for the state to "roll over" between windows (or be available to all windows).
> It will also be necessary to figure out when this state should be deleted (TTL? maximum
retention?)
> Another problem is how to deal with out of order data. If data comes in from the 10:00
AM window, should its state changes be visible to the data in the 9:00 AM window? 



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