#bin/hadoop namenode -format
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.
13/09/04 13:24:48 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = java.net.UnknownHostException: localhost1: localhost1
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 2.1.0-beta
解决办法
1）使用hostname命令设置新的host name与/etc/hosts本机hostname一致
#hostname --file file_whose_content_is_the_hostname
2) # /sbin/service network restart
3) 重新执行命令
#bin/hadoop namenode -format
hadoop版本：hadoop-2.1.0-beta