集群问题

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dataNode 连接ha两个主节点
nameNode 连接zookeeper
报错

org.apache.hadoop.ipc.Client: Retrying connect to server: THadoop7/26:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)

ip和端口都是通的，防火墙也已经关闭

在关闭集群时
no proxyserver to stop
和下面网址遇到的问题不一样
http://www.aboutyun.com/thread-11610-1-1.html

hive metastore
http://blog.csdn.net/skywalker_only/article/details/26219619
https://cwiki.apache.org/confluence/display/Hive/AdminManual+MetastoreAdmin
http://tangjunliang.iteye.com/blog/2037935

hadoop安全模式
http://www.cloudera.com/documentation/archive/cdh/4-x/4-2-0/CDH4-Security-Guide/cdh4sg_topic_3_9.html
http://f.dataguru.cn/thread-84564-1-1.html
https://discuss.zendesk.com/hc/en-us/articles/200933026-HDFS-goes-into-readonly-mode-and-errors-out-with-Name-node-is-in-safe-mode-

集群两个节点全都是standby ，原因是没有启动zookeeper

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