Shulou(Shulou.com)06/02 Report--

Solution to an error in hadoop formatting HDFS

Error message:

Host:java.net.UnknownHostException: centos-wang: centos-wang: unknown error

An unknown hostname appears when executing the hadoop namenode-format command.

The cause of the problem:

The reason for this problem is that when Hadoop formatted HDFS, the hostname obtained through the hostname command was mapped to the / etc/hosts file, but not found.

Solution:

1. Modify / etc/hosts content

2. Modify the hostname in / etc/sysconfig/network to localhost.

Execute:

/ etc/rc.d/init.d/network restart

Then rerun the hadoop namenode-format command

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