etcdserver: learner return code Unavailable for unsupported request types #27
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Make learner return code.Unavailable when the request is not supported by learner. Client balancer will retry a different endpoint.
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lgtm |
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Make learner return
code.Unavailableif the gRPC request type is not supported by learner. The retry and failover mechanism in client balancer is able to pick a different endpoint.Returning
code.Unavailableis also forward compatible. In future learner promotion is an automatic state change that is not initiated via an API call, and typically results in a brief period of unavailability when the learner member is catching up with system state and is not yet ready.cc @jpbetz @gyuho @WIZARD-CXY