Hadoop分布式启动报错ERROR: but there is no HDFS_NAMENODE

今天启动集群的时候报了一个错误，看一下

[root@hadloop2 hadoop-3.3.0]# sbin/start-dfs.sh
Starting namenodes on [hadoop2]
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 [hadoop1]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.

错误说的很详细了，就是缺少了一些启动参数吧。我们来添加一下就是了
进入咋们的sbin文件夹，这里要修改四个文件的配置(直接在第一行后面添加进行)

对于start-dfs.sh和stop-dfs.sh文件，添加下列参数：

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

对于start-yarn.sh和stop-yarn.sh文件，添加下列参数：

YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root

重新开始运行start-dfs.sh ，就可以了哦~

[root@hadloop2 hadoop-3.3.0]# sbin/start-dfs.sh
WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. Using value of HADOOP_SECURE_DN_USER.
Starting namenodes on [hadoop2]
上一次登录：二 8月 11 20:48:22 CST 2020从 hadoop4pts/4 上
hadoop2: ERROR: JAVA_HOME is not set and could not be found.

怎么又报错了呢？让不让人活了呀

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Hadoop分布式启动报错ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.

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