Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/19048
  
    Well, that's adding an API that does the same thing as existing APIs but a 
little bit differently. In my view that adds to the problem, instead of fixing 
it. Now every caller into the `ExecutorAllocationClient` has its own version of 
the API that does things the exact way they want.
    
    For example: the `replace` argument of the existing API is pretty much the 
functionality you want. The EAM can call `requestTotalExecutors` right before 
it calls `killExecutors(replace = true)` and achieve what it wants. It's just 
awkwardly named in this context.


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