Client Error: "java.net.ConnectException: Connection refused: no further information" after update HBase-0.20.6 to HBase0.90.2

[陈加俊]

WARN : 04-12 12:54:13 Session 0x0 for server null, unexpected error, closing
socket connection and attempting reconnect
java.net.ConnectException: Connection refused: no further information
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
WARN : 04-12 12:54:14 Session 0x0 for server null, unexpected error, closing
socket connection and attempting reconnect
java.net.ConnectException: Connection refused: no further information
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
WARN : 04-12 12:54:16 Session 0x0 for server null, unexpected error, closing
socket connection and attempting reconnect
java.net.ConnectException: Connection refused: no further information
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)

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Thanks & Best regards
jiajun