hadoop进入退出安全模式

查看状态

bin/hdfs dfsadmin -safemode get	

进入安全模式

[root@master hadoop]# bin/hdfs dfsadmin -safemode enter
19/11/03 05:24:20 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Safe mode is ON

退出安全模式

[root@master hadoop]# bin/hdfs dfsadmin -safemode leave
19/11/03 05:24:30 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Safe mode is OFF

修改配置文件

也可修改安全阀值
修改hdfs-site.xml

设置安全阀值属性，属性值默认为0.999f，如果设为1则不进行安全检查，
大于1将永久的处于安全模式

<property>
  <name>dfs.safemode.threshold.pct</name>
  <value>0.999f</value>
  <description>
    Specifies the percentage of blocks that should satisfy
    the minimal replication requirement defined by dfs.replication.min.
    Values less than or equal to 0 mean not to wait for any particular
    percentage of blocks before exiting safemode.
    Values greater than 1 will make safe mode permanent.
  </description>
</property>