Stephan Ewen created FLINK-3255:
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             Summary: Chaining behavior should not depend on parallelism
                 Key: FLINK-3255
                 URL: https://issues.apache.org/jira/browse/FLINK-3255
             Project: Flink
          Issue Type: Bug
          Components: Streaming
    Affects Versions: 1.0.0
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 0.10.1


Currently, operators are chained more aggressively when the parallelism is one. 
That makes debugging tougher as it changes threading behavior.

The benefits are also limited: Real installations where that type of efficiency 
would be needed would not run in parallelism 1, or would not use a 
partitioning/broadcast step there (if explicitly required to run parallelism 1).

In the future, when we want to allow parallelism to be adjusted dynamically, 
this will be even more tricky.



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