hadoop namenode -format出错

hadoop namenode -format 出错

hadoop格式化元数据的时候出错，错误信息

Caused by: java.net.UnknownHostException: at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293) at java.net.InetAddress.getLocalHost(InetAddress.java:1469) ... 8 more

原因本地host 在/etc/hosts 和 /etc/sysconfig/network 中映射错误，重新配置 hostname。在格式化的时候 hadoop会根据本地的hostname从/etc/hosts 寻找映射，如果找不到报错。