Xintong Song created FLINK-14060:

             Summary: Set slot sharing groups according to pipelined regions
                 Key: FLINK-14060
             Project: Flink
          Issue Type: Sub-task
            Reporter: Xintong Song

{{StreamingJobGraphGenerator}} set slot sharing group for operators at 
compiling time.
 * Identify pipelined regions, with respect to 
 * Set slot sharing groups according to pipelined regions 
 ** By default, each pipelined region should go into a separate slot sharing 
 ** If the user sets operators in multiple pipelined regions into same slot 
sharing group, it should be respected

This step should not introduce any behavior changes, given that later scheduled 
pipelined regions can reuse slots from previous scheduled pipelined regions. 

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