Kenneth Knowles created BEAM-23:
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             Summary: 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


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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