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java.io.IOException: NameNode is not formatted.	at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:330)	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:100)	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:411)	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.(FSNamesystem.java:379)	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:287)	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:548)	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1431)	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1440)