问题1.如果在搭建集群时碰到类似于这样的错误， Cannot open channel to 2 at election address
WARN [WorkerSender[myid=1]:QuorumCnxManager@584] - Cannot open channel to 2 at election address cdh03/192.168.5.148:3888
java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.socksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.socket.connect(Socket.java:589)
at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:558)
at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:534)
at org.apache.zookeeper.server.quorum.FastleaderElection$Messenger$WorkerSender.process(FastleaderElection.java:454)
at org.apache.zookeeper.server.quorum.FastleaderElection$Messenger$WorkerSender.run(FastleaderElection.java:435)
at java.lang.Thread.run(Thread.java:748)
4-11 13:22:04,597 [myid:1] - INFO [WorkerSender[myid=1]:QuorumPeer$QuorumServer@184] - Resolved hostname: cdh03 to address: cdh03/192.168.5.148
4-11 13:22:04,598 [myid:1] - WARN [WorkerSender[myid=1]:QuorumCnxManager@584] - Cannot open channel to 3 at election address cdh04/192.168.5.149:3888描述:这样的问题是你在配置集群地址的时候，他无法同时启动其他服务
解决:
本机用节点 用 0.0.0.0 IP代替主机名,如
[hadoop@cdh02 ~]$ cat /opt/software/zookeeper-3.4.13/conf/zoo.cfg
server.1=0.0.0.0:2888:3888
server.2=cdh03:2888:3888
server.3=cdh04:2888:3888
[hadoop@cdh03 ~]$ cat /opt/software/zookeeper-3.4.13/conf/zoo.cfg
server.1=cdh02:2888:3888
server.2=0.0.0.0:2888:3888
server.3=cdh04:2888:3888
[hadoop@cdh04 ~]$ cat /opt/software/zookeeper-3.4.13/conf/zoo.cfg
server.1=cdh02:2888:3888
server.2=cdh03:2888:3888
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