Matthias J. Sax created FLINK-3407:
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             Summary: Extend TwitterSource with interface StoppableFunction
                 Key: FLINK-3407
                 URL: https://issues.apache.org/jira/browse/FLINK-3407
             Project: Flink
          Issue Type: Improvement
          Components: Streaming Connectors
            Reporter: Matthias J. Sax


{{TwitterSource}} is not stoppable right now. To make it stoppable, is must 
implement {{StoppableFunction}}. Implementing method {{stop()}} must ensure, 
that the source stops receiving new Tweets and issues a final checkpoint. 
Afterwards, {{run()}} must return.

When implementing this, keep in mind, that the gathered checkpoint might later 
be used as a savepoint.




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