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Hbase master doesn't start

I have a problem with Hbase master, although namenode, and job tracker are working well.
2012-05-27 09:13:27,587 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server localhost/0:0:0:0:0:0:0:1:21812012-05-27 09:13:27,588 WARN org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnectjava.net.ConnectException: Connection refused at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567) at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1143)
Although /etc/hosts: localhost namenode.dalia.com10.0.2.5 datanode3.dalia.com10.0.2.6 datanode1.dalia.com10.0.2.7 datanode2.dalia.com

So any info.??????