grpc负责均衡

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域名转换为ip
net.devh.boot.grpc.client.nameresolver.DiscoveryClientNameResolver.Resolve#resolveInternal

获取链接
io.grpc.internal.ManagedChannelImpl.ChannelStreamProvider




使用ping检查服务可用性
io.grpc.netty.AbstractNettyHandler.FlowControlPinger#onDataRead