hadoop使用start-dfs.cm启动时，报如下错误：java.io.IOException: Failed on local exception: java.net.SocketException: Unresolved address; Host Details : local host is: "master"; destination host is: (unknown):0;
解决方法：
修改etc/hadoop目录下的core-site.xml，把hdfs://master:9000中的master改为本机ip即可。