kaisun2000 commented on issue #789: Add FederatedZkClient URL: https://github.com/apache/helix/pull/789#issuecomment-591110959 One design concern: The data/child listerner would be called on individual underlying DedicatedZkClient's event queue **concurrently** Previously client does not really expect this behavior. If their code is not thread-safe, which they are probably not, they would have hard to track concurrency issue. I think we should schedule the callback in one thread. Or at least we should explicitly document this issue. @dasahcc , @narendly , @jiajunwang , what is your take?
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