Yun Gao created FLINK-23512:
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             Summary: Check for illegal modifications of JobGraph with 
partially finished operators
                 Key: FLINK-23512
                 URL: https://issues.apache.org/jira/browse/FLINK-23512
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Checkpointing
    Affects Versions: 1.14.0
            Reporter: Yun Gao


Besides the fully finished operators, we also would like to disable inserting 
new operators before the partially finished operators:
 # If keyed state is used and discarded after the tasks get finished in the 
first run, then if we received new records target at these keys, the result 
would be not right.
 # Similarly, for normal operator subtasks, if new records are emitted and they 
relies on the discarded states, the result would also be confused. 

Thus we would first disable such cases. 



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