zpinto commented on PR #2661:
URL: https://github.com/apache/helix/pull/2661#issuecomment-1793143419

   CI failure is due to recurring flaky test testDistributedController 
https://github.com/apache/helix/issues/2498
   
   This PR is ready to be merged.
   
   Final Commit Message:
   
   Add ability for up to 2 nodes with the same logicalId to be added to the 
cluster at the same time when a SWAP is happening.
   During all paritionAssignment for WAGED and DelayedAutoRebalancer, we select 
just one instance for each logicalId. Achieves n -> n+1 for all replicas on 
SWAP_OUT node and back n when SWAP is marked complete, making it cancelable.
   
   Adding and updating Helix Admin APIs to support swap operation:
   - setInstanceOperation
   - addInstance
   - canCompleteSwap
   - completeSwapIfPossible
   


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