codis go packages
IN: n-client(go WritingLoop) --(Server.reqCh)--> 1-dispatch --(taskRunner.in)--> m-backend(writeloop)
OUT1: m-backend(readloop -[taskRunner.out]-> writeloop) --(session.backQ)--> n-client(WritingLoop)
OUT2: n-client(redisTunnel -[session.backQ]-> WritingLoop)