A major use of the consistent ring Hash algorithm is to solve the Memcache server down machine problem. The purpose is to minimize the impact of a Memcache server after it is added or removed. I will not describe the theory. There is too much information on the Internet. Please search for it by yourself. A ConsistencyRing class is written here to implement the algorithm. The specific code is downloaded here. Test class: public static void Test () {ConsistencyRing cr = new ConsistencyRing (); Console. writeLine ("=============== AddServer Test ==============="); cr. addServer ("1"); cr. addServer ("5"); cr. addServer ("9"); cr. addServer ("11"); cr. addServer ("3"); Console. writeLine ("=============== RemoveServer Test =================="); cr. removeServer ("5"); cr. removeServer ("3"); cr. removeServer ("1"); cr. removeServer ("9");} {Co NsistencyRing cr = new ConsistencyRing (); cr. addServer ("1"); cr. addServer ("5"); cr. addServer ("9"); cr. addServer ("11"); cr. addServer ("3"); Console. writeLine ("============== GetServerIp Test =============="); string key; string serverIp; key = "A1"; serverIp = cr [key]; Console. writeLine ("A1 IP:" + serverIp); cr. removeServer ("9"); serverIp = cr [key]; Console. writeLine ("A1 IP:" + serverIp) ;}} AddSer above For demonstration purposes, the parameters in ver/RemoveServer are changed to a concise numeric string. You can use a string like 192.168.1.1 for transmission. Running result: