错误日志：

2017-03-13T15:25:32.925+0800 o.a.z.ClientCnxn [WARN] 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) ~[na:1.7.0_91]	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:744) ~[na:1.7.0_91]	at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361) ~[zookeeper-3.4.6.jar:3.4.6-1569965]	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081) ~[zookeeper-3.4.6.jar:3.4.6-1569965]

work中报以上错误时，storm集群中supervisor可能挂掉了