CM cluster deployed first run error: Formatting the name directories of the current NameNode.

1. error prompt

Formatting the name directories of the current NameNode. If the name directories are not empty, this is expected to fail.

2. Problem Cause

Namenode formatted before, so this can not be formatted, you need to delete the original formatting.

3. Solution

1) dn at or nn / dfs directory

[root@hadoop101 dfs]# ls /dfs/
nn snn

Delete three machines (all machines) / dfs directory

rm -rf /dfs/

2) Then click to retry

 

Reference: https: //blog.csdn.net/u010886217/article/details/85333016