rabbah edited a comment on issue #4077: Fix bug of cal manged and blackboxes 
number
URL: 
https://github.com/apache/incubator-openwhisk/pull/4077#issuecomment-433268766
 
 
   This isn't actually a defect - it's true that 11 vs 10 is not perfect, but 
the reason for ceil/floor vs round is that for small number (say 2 invokers):
   
   ```
   Let newSize = 2 and blackboxFrac = 0.1.
   Current code:  managed = 2   blackboxes = 1
   This PR:  managed = 1   blackboxes = 1
   ```
   
   The point for small N up to the reciprocal of the fraction, both sets 
overlap.

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