启动start-yarn.sh报错ERROR: Attempting to operate on yarn resourcemanager as root ERROR: but there is no

ERROR: Attempting to operate on yarn resourcemanager as root
ERROR: but there is no YARN_RESOURCEMANAGER_USER defined. Aborting operation.
出现以上报错信息需要到 sbin 目录下 更改 start-yarn.sh 和 stop-yarn.sh 信息，在两个配置文件的第一行添加：

YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root

最后再 输入命令 /sbin/start-yarn.sh 启动 yarn