a2l007 commented on pull request #10105:
URL: https://github.com/apache/druid/pull/10105#issuecomment-652146731


   @gianm Prior to that patch, coordinator could assign segments to historicals 
even if the balancer couldn't find a valid move for a segment. This means that 
even if `druid.server.maxSize` isn't optimally configured, the coordinator 
could still assign segments to it.
   However, with the patch the coordinator avoids segment assignment if it 
cannot find valid moves. This means that existing clusters configured with 
incorrect `druid.server.maxSize` property could see coordinators not assigning 
segments even though the historicals have enough capacity. So I feel the docs 
needs to emphasize the importance of this property a bit more given the 
behavioral change.


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