After looking into code of branch-2.1. I found out Driver first handle executor connections by NettyRpcHandler. Once a connection arrive,driver's NettyRpcHandler will call receive,in which NettyRpcHandler#internalReceive will be called. And then NettyEnv#deserialize will be called,which will update NettyRpcEnv.currentClient used for NettyRpcEndpointRef#client. So although rpcaddress is null,the executor;s endpoint ref remained by driver will use the client to send message to executor. Correct me if you found out some other useful message.Thanks!
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