Unable to read additional data from server SessionID 0x0

Today, three zookeeper were installed in this machine, Server1,server2,server3.

tickTime=2000

initLimit=5  

syncLimit=2  

dataDir=/Users/google/Work/Program/zookeeper/server1/zookeeper-3.4.6/data

dataLogDir=/Users/google/Work/Program/zookeeper/server1/zookeeper-3.4.6/logs

clientPort=4080  

server.1=127.0.0.1:9991:7770  

server.2=127.0.0.1:9992:7771  

server.3=127.0.0.1:9993:7772  

Then started the Server3 zkserver.sh, with Server1 zkcli.sh to connect, the results reported the following error:

2015-05-25 18:06:21,667 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Opening socket connection to server 127.0.0.1/127.0.0.1:4083. Will not attempt to authenticate using SASL (java.lang.SecurityException: ?????λ??¼????)
JLine support is enabled
2015-05-25 18:06:21,678 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Socket connection established to 127.0.0.1/127.0.0.1:4083, initiating session
2015-05-25 18:06:21,690 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
[zk: 127.0.0.1:4083(CONNECTING) 0] 2015-05-25 18:06:23,045 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Opening socket connection to server 127.0.0.1/127.0.0.1:4083. Will not attempt to authenticate using SASL (java.lang.SecurityException: ?????λ??¼????)
2015-05-25 18:06:23,047 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Socket connection established to 127.0.0.1/127.0.0.1:4083, initiating session
2015-05-25 18:06:23,048 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2015-05-25 18:06:24,521 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Opening socket connection to server 127.0.0.1/127.0.0.1:4083. Will not attempt to authenticate using SASL (java.lang.SecurityException: ?????λ??¼????)
2015-05-25 18:06:24,522 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Socket connection established to 127.0.0.1/127.0.0.1:4083, initiating session
2015-05-25 18:06:24,523 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2015-05-25 18:06:25,942 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Opening socket connection to server 127.0.0.1/127.0.0.1:4083. Will not attempt to authenticate using SASL (java.lang.SecurityException: ?????λ??¼????)
2015-05-25 18:06:25,943 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Socket connection established to 127.0.0.1/127.0.0.1:4083, initiating session
2015-05-25 18:06:25,944 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2015-05-25 18:06:27,717 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Opening socket connection to server 127.0.0.1/127.0.0.1:4083. Will not attempt to authenticate using SASL (java.lang.SecurityException: ?????λ??¼????)
2015-05-25 18:06:27,717 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Socket connection established to 127.0.0.1/127.0.0.1:4083, initiating session
2015-05-25 18:06:27,718 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2015-05-25 18:06:29,608 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Opening socket connection to server 127.0.0.1/127.0.0.1:4083. Will not attempt to authenticate using SASL (java.lang.SecurityException: ?????λ??¼????)
2015-05-25 18:06:29,609 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Socket connection established to 127.0.0.1/127.0.0.1:4083, initiating session
2015-05-25 18:06:29,610 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2015-05-25 18:06:31,561 [myid:] - INFO  [main-SendThread(127.0.0.1:4083):[email protected]] - Opening socket connection to server 127.0.0.1/127.0.0.1:4083. Will not attempt to authenticate using SASL (java.lang.SecurityException: ?????λ??¼????)

It became clear later that, since I had configured 3 machines in Zoo.cfg, but only 1 were started, zookeeper would think the service was in an unusable state.

Zookeeper has an election algorithm that, when the entire cluster exceeds half of the machine down, zookeeper will assume that the cluster is in an unusable state.

All, 3 machines only start one cannot connect, if start 2 and above can connect.

Unable to read additional data from server SessionID 0x0