Stefan Richter created FLINK-5480:

             Summary: User-provided hashes for operators
                 Key: FLINK-5480
             Project: Flink
          Issue Type: Improvement
          Components: DataStream API
    Affects Versions: 1.2.0
            Reporter: Stefan Richter
            Assignee: Stefan Richter

We could allow users to provided (alternative) hashes for operators in a 
StreamGraph. This can make migration between Flink versions easier, in case the 
automatically produced hashes between versions are incompatible. For example, 
users could just copy the old hashes from the web ui to their job.

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