有好几次，启动Hadoop和HBase之后，执行jps命令，已经看到有HMaster的进程，

但是进入到HBase的shell，执行一个命令，会出现下面的错误：

ERROR: org.apache.hadoop.hbase.MasterNotRunningException: Retried 7 times

进入到logs目录查看master的日志：发现一直显示下面的内容：

2013-04-13 17:13:17,374 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...

2013-04-13 17:13:27,377 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...

2013-04-13 17:13:37,386 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...

2013-04-13 17:13:47,393 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...

2013-04-13 17:13:57,395 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...

2013-04-13 17:14:07,409 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...

原来是Hadoop在刚启动的时候，还处在安全模式造成的。

[root@Hadoop-NN-01 hadoop-2.6.0-cdh5.6.0]$ bin/hadoop dfsadmin -safemode get

Safe mode is ON

可等Hadoop退出安全模式后再执行HBase命令，或者手动退出Hadoop的安全模式

[root@Hadoop-NN-01 hadoop-2.6.0-cdh5.6.0]$ bin/hadoop dfsadmin -safemode leave

Safe mode is OFF

现在再执行HBase的命令就没有问题了。

hadoop dfsadmin-safemode 命令参数说明：

enter    - 进入安全模式

leave    - 强制NameNode离开安全模式

get      - 返回安全模式是否开启的信息

wait     - 等待，一直到安全模式结束。

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