Attempting to execute replacement "hdfs namenode" instead.

I'm sorry, but I'm not sure what you mean by "Attempting to execute replacement 'hdfs namenode' instead." Can you provide more context or clarify your question?

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Attempting to operate on hdfs namenode as root

回答: 当启动HDFS时出现"Attempting to operate on hdfs namenode as root"错误时，这意味着你正在以root用户身份尝试操作HDFS的namenode，但是没有定义HDFS_NAMENODE_USER。为了解决这个问题，你可以在start-dfs.sh和stop-dfs.sh两个文件的顶部添加以下参数：HDFS_NAMENODE_USER=root。这样就可以以root用户身份操作HDFS的namenode了。\[1\]\[2\]\[3\]
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ERROR: Attempting to operate on hdfs namenode as root

当启动HDFS时，如果出现错误"ERROR: Attempting to operate on hdfs namenode as root"，这意味着你正在尝试以root用户身份操作HDFS的namenode，但是没有定义HDFS_NAMENODE_USER。这是因为Hadoop在安全性方面的最佳实践是使用非root用户来运行Hadoop服务，以减少潜在的安全风险。要解决这个问题，你可以按照以下方法之一进行操作：

方法一：在启动HDFS之前，通过编辑start-dfs.sh文件，在顶部添加以下参数:

HDFS_NAMENODE_USER=root

然后保存并重新启动HDFS。

方法二：在环境配置文件（如.bashrc或.hadooprc）中添加以下变量并将其设置为root用户:

export HDFS_NAMENODE_USER=root

然后重新加载配置文件并重新启动HDFS。

无论你选择哪种方法，这样做都会将HDFS的namenode运行权限更改为root用户。请注意，这可能会带来一些安全风险，并且只应在测试或开发环境中使用。在生产环境中，建议使用一个专门的非root用户来运行HDFS。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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