THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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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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