Hadoop ERROR: Attempting to operate on hdfs namenode as root ERROR: but there is no HDFS_NAMENODE_US

In the sbin directory under the hadoop installation directory, respectively modify /start-dfs.sh /stop-dfs.sh /start-yarn.sh /stop-yarn.shThe content of the modified file should be added in the file #!/usr/bin/env bash

/start-dfs.sh /stop-dfs.sh Modified content (HADOOP_SECURE_DN_USER is replaced by HADOOP_SECURE_DN_USER.) above hadoop 3.2 version.)

HDFS_DATANODE_USER=root
HADOOP_SECURE_DN_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root

/start-yarn.sh  /stop-yarn.sh Modify content

YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root