huwh commented on PR #22424:
URL: https://github.com/apache/flink/pull/22424#issuecomment-1514295430

   Thanks @reswqa, I will update this pr asap.
   
   > Does this optimization only have a more obvious effect in the failover 
scenario?
   yes, the slot pool is empty when job first scheduled. So the heavy operation 
on slot selecting will be skipped.


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