Hadoop mapreduce的“无法解析主机名”错误 [英] Hadoop mapreduce has "Cannot resolve the host name" error

问题描述

现在我运行Hadoop mapreduce作业，输入数据来自HBase表，最近出现错误，错误如下：
$ b ERROR mapreduce。 TableInputFormatBase：由于javax.naming.NameNotFoundException：无法解析/172.16.4.195的主机名：找不到DNS名称[response code 3];剩余名称'195.4.16.172.in-addr.arpa'

* 172.16.4.195 *是群集节点（从属） ip地址，我不知道什么是195.4.16.172。

当我第一次运行这个工作时，没有这样的错误，我不知道为什么会有这样的错误一个错误。
如果你解决了这个问题，请告诉我，谢谢。

解决方案

reverse dns not found，you need add例如

  172.16.4.195 master_host_name 
  

到主机文件

如果在Linux上运行，文件位于/ etc / hosts

如果在Windows上运行，位于％WINDIR％/ System32 / Drivers / etc / hosts的文件

Now I run Hadoop mapreduce job, the input data comes from HBase table, recently there is an error, the error is below:

ERROR mapreduce.TableInputFormatBase: Cannot resolve the host name for /172.16.4.195 because of javax.naming.NameNotFoundException: DNS name not found [response code 3]; remaining name '195.4.16.172.in-addr.arpa'

*172.16.4.195*is cluster node(slave)ip adress, I do not know what is "195.4.16.172".

There was no such error when I firstly run this job,I do not know why there is such an error. If you solved the problem,please tell me,thank you.

解决方案

reverse dns not found, you need add something like

172.16.4.195 master_host_name

to hosts file

if running on linux, the file located at /etc/hosts

if running on windows, the file located at %WINDIR%/System32/Drivers/etc/hosts

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