1、查看namenode是否是安全状态
hadoop dfsadmin -safemode get Safe mode is OFF
2、进入安全模式(hadoop启动时30秒内是安全状态)
nange@ubuntu:/$ hadoop dfsadmin -safemode enter Safe mode is ON
3、离开安全模式
nange@ubuntu:/$ hadoop dfsadmin -safemode leave Safe mode is OFF
1、查看namenode是否是安全状态
hadoop dfsadmin -safemode get Safe mode is OFF
2、进入安全模式(hadoop启动时30秒内是安全状态)
nange@ubuntu:/$ hadoop dfsadmin -safemode enter Safe mode is ON
3、离开安全模式
nange@ubuntu:/$ hadoop dfsadmin -safemode leave Safe mode is OFF