jiajunwang commented on issue #680: Question on CrushEd rebalance algorithm and 
MasterSalve state model for Pinot
URL: https://github.com/apache/helix/issues/680#issuecomment-573941576
 
 
   The reason for this Exception, as far as I can remember, is to terminate the 
pipeline if the rebalancer cannot calculate the new mapping. Otherwise, the 
later stages will execute based on an incomplete or even empty mapping. This 
could be dangerous.
   But I agree that we should be able to handle the empty cluster case more 
gracefully. In this case, an empty mapping is the only option that the 
rebalancer can return. Let me talk with the team at tomorrow's standup meeting.

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