[GitHub] [pinot] Jackie-Jiang commented on pull request #8441: Add retainInstancesSequence feature to table rebalance to minimize data movement between instances

[GitBox <gi...@apache.org>]

Jackie-Jiang commented on pull request #8441:
URL: https://github.com/apache/pinot/pull/8441#issuecomment-1085241390


   I don't follow why we need to store the pool to instances mapping in the ZK. Essentially what we need is to pass the existing instance partitions to the `InstanceReplicaGroupPartitionSelector.selectInstances()`, and add a flag to enable `minimizeMovement` and use a greedy algorithm to retain as much instances as possible from the candidate instances from each pool.


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