start-yarn.sh出错： ERROR: but there is no YARN_RESOURCEMANAGER_USER defined. Aborting operation.

start-yarn.sh出错
Starting resourcemanager ERROR: Attempting to operate on yarn resourcemanager as root ERROR: but there is no YARN_RESOURCEMANAGER_USER defined. Aborting operation. Starting nodemanagers ERROR: Attempting to operate on yarn nodemanager as root ERROR: but there is no YARN_NODEMANAGER_USER defined. Aborting operation.
是因为共有用户定义造成的，所以分别编辑开始和关闭脚本

$ vim sbin/start-yarn.sh
$ vim sbin/stop-yarn.sh
顶部添加

YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root