zookeeper client error logs

gistfile1.txt

vagrant@host4:/opt/zookeeper/bin$ ./zkCli.sh -server 192.168.33.12:2181
Connecting to 192.168.33.12:2181
2015-03-27 21:01:44,786 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
2015-03-27 21:01:44,791 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=host4.example.org
2015-03-27 21:01:44,791 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.7.0_75
2015-03-27 21:01:44,795 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2015-03-27 21:01:44,795 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-7-openjdk-amd64/jre
2015-03-27 21:01:44,796 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/opt/zookeeper/bin/../build/classes:/opt/zookeeper/bin/../build/lib/*.jar:/opt/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/opt/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/opt/zookeeper/bin/../lib/netty-3.7.0.Final.jar:/opt/zookeeper/bin/../lib/log4j-1.2.16.jar:/opt/zookeeper/bin/../lib/jline-0.9.94.jar:/opt/zookeeper/bin/../zookeeper-3.4.6.jar:/opt/zookeeper/bin/../src/java/lib/*.jar:/opt/zookeeper/bin/../conf:
2015-03-27 21:01:44,796 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
2015-03-27 21:01:44,796 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2015-03-27 21:01:44,797 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2015-03-27 21:01:44,797 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2015-03-27 21:01:44,797 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2015-03-27 21:01:44,797 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.13.0-24-generic
2015-03-27 21:01:44,797 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=vagrant
2015-03-27 21:01:44,798 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/home/vagrant
2015-03-27 21:01:44,798 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/opt/zookeeper/bin
2015-03-27 21:01:44,800 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.33.12:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@65297ad9
Welcome to ZooKeeper!
2015-03-27 21:01:44,844 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@975] - Opening socket connection to server 192.168.33.12/192.168.33.12:2181. Will not attempt to authenticate using SASL (unknown error)
2015-03-27 21:01:44,863 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@852] - Socket connection established to 192.168.33.12/192.168.33.12:2181, initiating session
JLine support is enabled
2015-03-27 21:01:44,873 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@1098] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
[zk: 192.168.33.12:2181(CONNECTING) 0] 2015-03-27 21:01:46,764 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@975] - Opening socket connection to server 192.168.33.12/192.168.33.12:2181. Will not attempt to authenticate using SASL (unknown error)
2015-03-27 21:01:46,765 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@852] - Socket connection established to 192.168.33.12/192.168.33.12:2181, initiating session
2015-03-27 21:01:46,768 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@1098] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2015-03-27 21:01:48,729 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@975] - Opening socket connection to server 192.168.33.12/192.168.33.12:2181. Will not attempt to authenticate using SASL (unknown error)
2015-03-27 21:01:48,731 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@852] - Socket connection established to 192.168.33.12/192.168.33.12:2181, initiating session
2015-03-27 21:01:48,734 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@1098] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2015-03-27 21:01:50,173 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@975] - Opening socket connection to server 192.168.33.12/192.168.33.12:2181. Will not attempt to authenticate using SASL (unknown error)
2015-03-27 21:01:50,175 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@852] - Socket connection established to 192.168.33.12/192.168.33.12:2181, initiating session
2015-03-27 21:01:50,177 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@1098] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2015-03-27 21:01:51,718 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@975] - Opening socket connection to server 192.168.33.12/192.168.33.12:2181. Will not attempt to authenticate using SASL (unknown error)
2015-03-27 21:01:51,719 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@852] - Socket connection established to 192.168.33.12/192.168.33.12:2181, initiating session
2015-03-27 21:01:51,721 [myid:] - INFO  [main-SendThread(192.168.33.12:2181):ClientCnxn$SendThread@1098] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect