安装 Hadoop 的一些问题。ERROR: Attempting to operation on hdfs namenode as root ERROR:答案

【问题标题】：Some problems in installing Hadoop.ERROR: Attempting to operate on hdfs namenode as root ERROR:安装 Hadoop 的一些问题。ERROR: Attempting to operation on hdfs namenode as root ERROR:
【发布时间】：2020-05-27 14:59:48
【问题描述】：

我是学习 Hadoop 的新手。我在其配置中遇到了一些问题。在此之前，我完成了 JAVA、SSH、core-site.xml、hdfs-site.xml 和 hadoop-env.sh 的配置。请告诉我该如何解决。非常感谢。

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 hadoop-env.sh 中添加 5 行后，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).

【问题讨论】：

标签： hadoop hdfs hadoop-yarn

【解决方案1】：

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，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

希望对你有帮助

【讨论】：

我理解你的意思，试试你的方法。但是，这一次，它警告其他人，我编辑了我的旧问题。你能看到它并告诉我如何解决它吗？感谢您的帮助。