Fly-Style commented on PR #20708:
URL: https://github.com/apache/druid/pull/20708#issuecomment-6441655660

   > Instead, a good intuitive alternative would be to reset the running 
average every time the scaling cooldown elapses. Then every (actionable) scale 
up or scale down decision is not polluted by old metrics even if taskDuration 
is much longer minScaleUpDelay or minScaleDownDelay. 
   
   I fully agree with that statement, would love to see it. 
   
   > But implementing that seems more complicated than necessary at the moment.
   
   May agree with that.
   
   > Once a taskCount has been chosen, commit to it and let it become stable.
   
   Here where my concern is risen. Do we want to commit to unlucky choice at 
the beginning, while the general design should be tied to [task amount] 
cost-efficiency?


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