Hadoop常见问题2 Attempting to operate on hdfs namenode as root but there is no HDFS_NAMENODE_USER define

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问题原因

hadoop 试图使用root用户操作，但是在环境变量中没有配置使用的用户，所以终止了程序。

问题描述

Starting namenodes on [192.168.72.102]
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 [localhost.localdomain]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.

解决方案

在 hadoop安装包下的 etc/hadoop/hadoop-env.sh 环境配置文件下添加如下配置

export HDFS_NAMENODE_USER=root
export HDFS_SECONDARYNAMENODE_USER=root
export HDFS_DATANODE_USER=root

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