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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