解决Name node is in safe mode的问题

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问题：解决“Name node is in safe mode”：

命令：hadoop dfsadmin -safemode leave

hadoop dfsadmin -safemode <参数>，参数如下：
enter - 进入安全模式
leave - 强制离开安全模式
get - 返回安全模式状态信息
wait - 等待，一直到安全模式结束

备注，现象：

FAILED: Hive Internal Error: java.lang.RuntimeException(org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /tmp/hive-hadoop/hive_2013-01-15_09-44-13_535_6573627171297486311. Name node is in safe mode.
The ratio of reported blocks 0.9986 has not reached the threshold 0.9990. Safe mode will be turned off automatically.
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:2055)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:2029)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.mkdirs(NameNode.java:817)

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