Error in Cluster Startup: NameNode is not formatted

[Boyu Zhang]

Hi all,

I am a student and I am trying to install the Hadoop on a cluster, I have
one machine running namenode, one running jobtracker, two slaves.

When I run the /bin/start-dfs.sh , there is something wrong with my
namenode, it won't start. Here is the error message in the log file:

 ERROR org.apache.hadoop.fs.FSNamesystem: FSNamesystem initialization
failed.
java.io.IOException: NameNode is not formatted.
        at
org.apache.hadoop.dfs.FSImage.recoverTransitionRead(FSImage.java:243)
        at
org.apache.hadoop.dfs.FSDirectory.loadFSImage(FSDirectory.java:80)
        at
org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:294)
        at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:273)
        at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:148)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:193)
        at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:179)
        at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:830)
        at org.apache.hadoop.dfs.NameNode.main(NameNode.java:839)


I think it is something stupid i did, could somebody help me out? Thanks a
lot!


Sincerely,

Boyu Zhang