Hadoop【问题记录 01】【hadoop-3.1.3 单机版】【Attempting to operate on hdfs namenode as root】

以下内容根据 DoNotStop 的博客进行整理。

报错

我是在安装 hadoop-3.1.3.tar.gz 单机版后启动时遇到的报错，内容如下：

[root@tcloud sbin]#  ./start-dfs.sh
Starting namenodes on [tcloud]
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 [tcloud]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.

解决

在 ${HADOOP_HOME}/sbin路径下
start-dfs.sh，stop-dfs.sh 这两个文件顶部添加以下参数：

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

start-yarn.sh，stop-yarn.sh 这两个文件顶部添加以下参数：

YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root

启动后报错：

WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. 
Using value of HADOOP_SECURE_DN_USER.

最终修改：
start-dfs.sh，stop-dfs.sh 这两个文件顶部添加以下参数：

HDFS_DATANODE_USER=root
HDFS_DATANODE_SECURE_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root

start-yarn.sh，stop-yarn.sh 这两个文件顶部添加以下参数：

YARN_RESOURCEMANAGER_USER=root
HDFS_DATANODE_SECURE_USER=yarn
YARN_NODEMANAGER_USER=root

说明：

1. 集群版的 master和slav e都需要修改start-dfs.sh、stop-dfs.sh、start-yarn.sh、stop-yarn.sh这四个文件。
2. 如果Hadoop是其它用户启动，要修改用户名。