Permission denied: user=dr.who, access=READ_EXECUTE, inode="/tmp":hadoopadmin:supergroup:drwx-wx-wx

2. Cause analysis:

In case of insufficient user permissions, you can see that this tmp folder does not have read r permission for other users. The default login user of the page is dr.who users

3. Solution:

1. Change the permissions of TMP

Just execute the code:

hdfs dfs -chmod -R 777 /tmp

2. Modify the default login user of 50070

The core-site.xml can be configured as the user name corresponding to Hadoop

<property>
    <name>hadoop.http.staticuser.user</name>
    <value>username</value>
</property>