org.apache.hadoop.hdfs.server.namenode.NameNode: java.lang.NullPointerException

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    org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.IOException: NameNode is not formatted.

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    Root Cause Analysis

    1. org.apache.hadoop.hdfs.server.namenode.NameNode

      java.lang.NullPointerException

      at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild()
    2. Apache Hadoop HDFS
      NameNode.main
      1. org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1099)
      2. org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1111)
      3. org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedMkdir(FSDirectory.java:996)
      4. org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedMkdir(FSDirectory.java:983)
      5. org.apache.hadoop.hdfs.server.namenode.FSEditLog.loadFSEdits(FSEditLog.java:712)
      6. org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:1021)
      7. org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:839)
      8. org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:377)
      9. org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:100)
      10. org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:388)
      11. org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:362)
      12. org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:276)
      13. org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:496)
      14. org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1279)
      15. org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1288)
      15 frames