Hadoop3 启动，提示ERROR: Attempting to operate on hdfs namenode as root ***

刺骨的言语ヽ痛彻心扉 2023-10-10 16:14 39阅读 0赞

在CentOS-7 搭建伪分布式Hadoop3 测试环境，执行start-all.sh 提示如下错误信息：

Starting namenodes on [namenode]
    ERROR: Attempting to operate on hdfs namenode as root
    ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
    Starting datanodes
    ERROR: Attempting to operate on hdfs datanode as root
    ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
    Starting secondary namenodes [datanode1]
    ERROR: Attempting to operate on hdfs secondarynamenode as root
    ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
    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.

造成此问题的原因是：将Hadoop各进程(NameNode、DataNode、SECONDARYNAMENODE、ResourceManager、NodeManager)用户设置为root,而start-dfs.sh/stop-dfs.sh、start-yarn.sh/stop-yarn.sh 脚本没有添加root 账户声明。

**解决办法：**

在start-dfs.sh/stop-dfs.sh 开头处添加如下代码片段：

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

在start-yarn.sh/stop-yarn.sh 开头处添加如下代码片段：

YARN_RESOURCEMANAGER_USER=root
    HADOOP_SECURE_DN_USER=yarn
    YARN_NODEMANAGER_USER=root