名称节点处于安全模式。无法离开 [英] Name node is in safe mode. Not able to leave

问题描述

  root＃bin / hadoop fs -mkdir t 
 mkdir：org.apache.hadoop.hdfs.server.namenode.SafeModeException：无法创建目录/ user / root / t 。名称节点处于安全模式。 
  

无法在hdfs中创建任何内容

我做了

  root＃bin / hadoop fs -safemode leave 
   
 
 
但显示
 
 
 安全模式：未知命令
  
有什么问题？ 
 
 
  <强>解决方案  
解决方案
为了强制让namenode离开安全模式，应执行以下命令：
 
 
  bin / hadoop dfsadmin -safemode leave 
  
 未知命令您的命令错误为 -safemode 不是 hadoop的子命令fs ，但它是 hadoop dfsadmin 。
 
 
 
在上述命令之后，我建议你一次运行 hadoop fsck 这样
 
 
 
 更新：  
 
 
使用 hdfs 命令而不是 hadoop 命令更新的发行版。  hadoop 命令已被弃用：
  hdfs dfsadmin -safemode leave 
  
  hadoop dfsadmin 已被弃用， code> hadoop fs 命令，所有与hdfs相关的任务都被移动到一个单独的命令 hdfs 中。  
root# bin/hadoop fs -mkdir t
mkdir: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /user/root/t. Name node is in safe mode.
not able to create anything in hdfs

I did 
root# bin/hadoop fs -safemode leave
But showing 
safemode: Unknown command
what is the problem?

Solution
解决方案
In order to forcefully let the namenode leave safemode, following command should be executed:
 bin/hadoop dfsadmin -safemode leave
You are getting Unknown command error for your command as -safemode isn't a sub-command for hadoop fs, but it is of hadoop dfsadmin.

Also after the above command, I would suggest you to once run hadoop fsck so that any inconsistencies crept in the hdfs might be sorted out.

Update:

Use hdfs command instead of hadoop command for newer distributions. The hadoop command is being deprecated:
hdfs dfsadmin -safemode leave
hadoop dfsadmin has been deprecated and so is hadoop fs command, all hdfs related tasks are being moved to a separate command hdfs. 

                        
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