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java.lang.NullPointerException: 	at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:135)	at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:172)	at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:176)	at org.apache.hadoop.hdfs.server.namenode.NameNode.getRpcServerAddress(NameNode.java:204)	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:242)	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:373)	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:367)	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1121)	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1130)