解决：ERROR: Attempting to operate on hdfs journalnode as rootERROR: but there is no HDFS_JOURNALNODE_
问题描述：安装Hadoop3X HA完成后为了验证安装开启Hadoop
执行：start-all.sh
报错：
ERROR: Attempting to operate on hdfs namenode as root
ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
ERROR: Attempting to operate on hdfs datanode as root
ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
ERROR: Attempting to operate on hdfs journalnode as root
ERROR: but there is no HDFS_JOURNALNODE_USER defined. Aborting operation.
ERROR: Attempting to operate on hdfs journalnode as root
ERROR: but there is no YARN_RESOURCEMANAGER_USER Aborting operation.
ERROR: Attempting to operate on hdfs journalnode as root
ERROR: but there is no YARN_NODEMANAGER_USER Aborting operation.
错误原因：
试图以根用户身份在hdfs namenode上操作，但是没有定义HDFS _ NAMENODE _用户。中止操作。
解决：
在环境变量中在添加：
1.进入环境变量
vi ~/.bash_profile2.添加：
export HDFS_NAMENODE_USER=root
export HDFS_DATANODE_USER=root
export HDFS_JOURNALNODE_USER=root
export HDFS_SECONDARYNAMENODE_USER=root
export YARN_RESOURCEMANAGER_USER=root
export YARN_NODEMANAGER_USER=root
3.环境变量生效
source ~/.bash_profile完成！成功解决！！！
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