使用root配置的hadoop啟動時報錯

一、報錯信息：

　　Starting namenodes on [master]

        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 [slave1]

        ERROR: Attempting to operate on hdfs secondarynamenode as root

        ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.

二、解決辦法

在/hadoop/sbin路徑下： 

將 start-dfs.sh，stop-dfs.sh兩個文件頂部添加以下參數

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

如下圖：

start-yarn.sh，stop-yarn.sh頂部也添加以下參數
YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root

 如下圖：

 

三、添加完啟動遇到如下警告：

WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER.

需要將第二句：HADOOP_SECURE_DN_USER=hdfs  改為 HDFS_DATANODE_SECURE_USER=hdfs