Hadoop 解除 安全模式、"Name node is in safe mode"
2017-10-17 19:59
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有两个方法离开安全模式
(1)修改dfs.safemode.threshold.pct为一个比较小的值,默认缺省是0.999f。在hadoop的安装目录中的hdfs-site.xml 加修改的配置项,默认的值是float类型,设置一个较小的数值。
如:
<property> <name>dfs.safemode.threshold.pct</name> <value>0.111f</value> </property>
(2)hadoop dfsadmin -safemode leave命令强制离开
用户可以通过dfsadmin -safemode value 来操作安全模式,参数value的说明如下:
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。
方法一,可以一劳永逸,虽然有风险,方法二需要在每次重启hdfs集群的时候都要输入!
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