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• • rebalance requests are processed one-at-a-time by a singleton thread executor;
  • each time a request time, we submit the rebalance task into the thread executor and add it to the task queue.;
  • once a rebalance task completes, we remove the task from the task queue;
  • a cancellation request will cancel of running or pending requests in the rebalance task queue.
    
    

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