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https://issues.apache.org/jira/browse/BEAM-23?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395848#comment-15395848
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Kenneth Knowles commented on BEAM-23:
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Design proposal is at https://s.apache.org/beam-state.
> User-facing state and timers for ParDo(DoFn)
> --------------------------------------------
>
> Key: BEAM-23
> URL: https://issues.apache.org/jira/browse/BEAM-23
> Project: Beam
> Issue Type: New Feature
> Components: beam-model
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
> Labels: State
>
> To a key-partitioned ParDo, add the ability for a user's DoFn to, on a
> per-key-and-window basis:
> - read and write consistent state
> - set a timer to request a callback at a particular moment (in any time
> domain)
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