Kenneth Knowles created BEAM-3194:
-------------------------------------

             Summary: Support annotating that a DoFn requires stable / 
deterministic input for reply/retry
                 Key: BEAM-3194
                 URL: https://issues.apache.org/jira/browse/BEAM-3194
             Project: Beam
          Issue Type: New Feature
          Components: beam-model
            Reporter: Kenneth Knowles
            Assignee: Kenneth Knowles


See the thread: 
https://lists.apache.org/thread.html/5fd81ce371aeaf642665348f8e6940e308e04275dd7072f380f9f945@%3Cdev.beam.apache.org%3E

We need this in order to have truly cross-runner end-to-end exactly once via 
replay + idempotence.



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