安装Hadoop时出现一些问题。错误：尝试以根用户身份在hdfs namenode上操作错误：

我是学习Hadoop的新手。我在配置上遇到了一些问题。在此之前，我完成了JAVA、SSH、core-site.xml、hdfs-site.xml和hadoop-env.sh的配置。请告诉我如何解决这个问题。多谢各位

root@host1-virtual-machine:/home/host1/usr/hadoop-3.2.1# sbin/start-all.sh
Starting namenodes on [localhost]
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 [host1-virtual-machine]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
2020-02-12 13:19:37,322 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
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.

在我向hadoop-env.sh中添加5行之后，它会发出以下警告：

Starting namenodes on [localhost]
localhost: root@localhost: Permission denied (publickey,password).
Starting datanodes
localhost: root@localhost: Permission denied (publickey,password).
Starting secondary namenodes [host1-virtual-machine]
host1-virtual-machine: root@host1-virtual-machine: Permission denied (publickey,password).
2020-02-12 20:26:27,702 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting resourcemanager
Starting nodemanagers
localhost: root@localhost: Permission denied (publickey,password).

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出现此问题的原因是在安装和启动服务时使用了不同的用户。 您可以在hadoop-env.sh中将用户定义为root用户，如下所示：

export HDFS_NAMENODE_USER=root
export HDFS_DATANODE_USER=root
export HDFS_SECONDARYNAMENODE_USER=root
export YARN_RESOURCEMANAGER_USER=root
export YARN_NODEMANAGER_USER=root

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希望这有助于我理解你的意思并尝试你的方法。但是，这一次，它警告其他人，我编辑了我的老问题。你能看看并告诉我怎么解决吗？谢谢你的帮助。