clownxc commented on PR #22555:
URL: https://github.com/apache/flink/pull/22555#issuecomment-1542368896

   > @clownxc Thanks for creating this pr! I'm curious why you don't fallback 
the value of globalDefaultSourceParallelism to parallelism.default if necessary 
outside the constructor of DefaultVertexParallelismAndInputInfosDecider? This 
change will be much cleaner. In addition, we do not require that 
parallelism.default must be a positive number. On the contrary, before version 
1.17, users need to configure parallelism.default = -1 to enable parallelism 
derivation. WDYT?
   Thank you, I will try to modify the code as you say
   
   


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