Jackie-Jiang opened a new pull request, #9866:
URL: https://github.com/apache/pinot/pull/9866

   We should not sort the instances in the generated `InstancePartitions` 
because:
   1. It will lead to different assignment result comparing to default 
consuming segment assignment, which makes migration hard
   2. It will lead to skewed partition assignment within replica group when 
`numInstancesPerReplicaGroup` doesn't match stream partitions - the instances 
with smaller names tend to get more partitions across multiple tables


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