7. zookeeper.RecoverableZooKeeper: ZooKeeper exists failed after 3 retries

ERROR zookeeper.RecoverableZooKeeper: ZooKeeper exists failed after 3 retries
15/04/10 23:26:24 WARN zookeeper.ZKUtil: hconnection Unable to set watcher on znode /hbase/master
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase/master

이런 에러 뜨게 되면

아래 처럼 바구러ㅏ

Hi, J-D,
I just made summary about the experiences to set up a pseudo-distributed
mode HBase.
1) RedHat 9 is not suitable for running HBase and Hadoop. I don't know the
reasons. Now Ubuntu is my choice.
2) After the pseudo-distributed mode of HDFS is configured, it is required
to configure the hbase-env.sh and hbase-site.xml. The book, HBase the
Definitive Guide, does not mentions hbase.env.xml.
3) It should set up JAVA_HOME, HBASE_CLASSPATH and HBASE_MANAGES_ZK. My
hbase-env.sh is as follows.
     export JAVA_HOME=/opt/jdk1.6.1/
     export HBASE_CLASSPATH=/opt/hbase-0.92.0/conf
     export HBASE_OPTS="-XX:+UseConcMarkSweepGC"
     export HBASE_MANAGES_ZK=true
4) When configuring hbase-site.xml, the property,
hbase.cluster.distributed, must be set also. The book, HBase the Definitive
Guide, does not do that either. My hbase-site.xml is as follows.
           hbase.rootdir
           hdfs://localhost:9000/hbase
           dfs.replication
           1
           hbase.cluster.distributed
           true
I am a new user of HBase. Your suggestions are highly appreciated.
Best regards,
Bing