Ben Chambers created BEAM-1655:
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             Summary: Evaluate the PubsubUnboundedSource
                 Key: BEAM-1655
                 URL: https://issues.apache.org/jira/browse/BEAM-1655
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-extensions
            Reporter: Ben Chambers
            Assignee: Davor Bonaci


This source includes a lot of assumptions & assertions that may cause problems 
on runners that implement UnboundedSources differently. For example:

1. It requires that finalizeCheckpoint is called at most once.
2. It requires that the checkpoint be finalized within the pubsub timeout, or 
the messages will be redelivered.
... (possibly other assumptions) ... 



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