Cross-zone Stoppable Check

[MarkGaox]

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The current limitation of the stoppable check API restricts the evaluation of stoppable instances to a single zone, even when instances from multiple zones are provided in the given list. There's a need to extend this functionality to support cross-zone stoppable checks.

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• Refactor the existing single-zone stoppable check logic into a separate function for modularity and easier extension. Refactor stoppable check logic for enhanced zone analysis #2654
• Modify the MIN_REPLICA_CHECK to account for instances already marked for stopping, ensuring a comprehensive cross-zone evaluation.
  Implement the cross-zone-based stoppable check #2680
• Ensure the stoppable check will treat evacuating instances as to be stopped instances; build a feature that allows users to whitelist a bunch of stoppable checks.
  Implement node evacuation filtering during checks and add blacklist for stoppable checks #2687

Won't do:

• Integrate the stoppable check functionality with the helix-rest cache to minimize the load on Zookeeper reads and ensure efficient operation.

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[junkaixue]

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[MarkGaox]

Thanks @junkaixue. Mark it as closed.