Github user GraceH commented on the pull request:

    https://github.com/apache/spark/pull/7888#issuecomment-127444561
  
    @CodingCat  What I mean is to add the force control in the 
```killExecutors``` API.  Currently, the dynamic allocation is using that API 
with force=false (I suppose we should not kill working executors in Dynamic 
allocation). And for others, they are free to use that option as true or false. 
 If they really want to do that, they can call the private API by setting that 
as ```true```.
    
    Regarding the public API for the users, we'd better have a discussion if to 
add a new public API (it is a little bit out of this PR's scope). From my 
perspective, to modify the exiting public API is not a good idea. It may cause 
compatibility issue. What do you think?


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