为什么我无法访问http：// hadoop-master：50070当我定义dfs.namenode.http-address [英] Why I can't access http://hadoop-master:50070 when i define dfs.namenode.http-address

问题描述

Hadoop版本为2.7.1
修改hdfs.xml，添加两个属性：

 <性> 
<名称> dfs.namenode.http-address< / name> 
<值> HADOOP-MASTER：50070< /值> 
< / property> 
<属性> 
< name> dfs.namenode.secondary.http-address< / name> 
<值> HADOOP-SLAVE-1：50090< /值> 
< / property> 
  

然后重新启动hadoop群集，但我无法访问 http：// hadoop-master：50070 。
namenode进程处于活动状态。
和

  [hadoop @ HADOOP-MASTER〜] $ lsof -i：50070 
 COMMAND PID USER FD类型设备大小/关闭节点名称
 java 26541 hadoop 184u IPv4 1261606 0t0 TCP HADOOP-MASTER：50070（LISTEN）
  

但是，当我删除 dfs.namenode.http-address 属性时，50070正在运行。

$ b $因此，问题是 dfs.namenode.http-address 属性的意思，我猜它定义了可以访问的节点？

$ b $该值被定义为地址和dfs namenode web ui将在其上侦听的基础端口，并且默认值为 0.0.0.0:50070，这意味着它可以被所有可达到它的机器公开访问。

注意地址是地址，而不是主机名。如果您需要从默认值更改此值，请使用IP地址，而不是物理机器名称。

资料来源： https://hadoop.apache.org/docs/r2.7.1/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml

The Hadoop Version is 2.7.1 Modify the hdfs.xml , add two properties：

<property>
    <name>dfs.namenode.http-address</name>
    <value>HADOOP-MASTER:50070</value>
</property>
<property>
    <name>dfs.namenode.secondary.http-address</name>
    <value>HADOOP-SLAVE-1:50090</value>
</property>

And restart the hadoop cluster,but I can't access http://hadoop-master:50070. the namenode process is alive. and

 [hadoop@HADOOP-MASTER ~]$ lsof -i:50070
 COMMAND   PID   USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
 java    26541 hadoop  184u  IPv4 1261606      0t0  TCP HADOOP-MASTER:50070 (LISTEN)

But when I remove the dfs.namenode.http-address property,the 50070 worked on.

So,The Problem is what dfs.namenode.http-address property mean,I guess it define the node who can access?

解决方案

That value is defined as "The address and the base port where the dfs namenode web ui will listen on" and defaults to 0.0.0.0:50070, which means it is publicly accessible to all machines that can reach it.

Notice that is says address, not hostname. If you need to change this value from the default, use an IP address, not a physical machine name.

Source: https://hadoop.apache.org/docs/r2.7.1/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml

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