Exception in thread "main" java.lang.IllegalArgumentException: java.net.UnknownHostException: node1227
at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:374)
at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:310)
at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:287)
at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.initialize(SecondaryNameNode.java:232)
at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.<init>(SecondaryNameNode.java:192)
at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main(SecondaryNameNode.java:671)
Caused by: java.net.UnknownHostException: node1227
在/etc/hosts目录中配置node1227的ip
原文：https://www.cnblogs.com/allenyip/p/11194512.html