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From Matt Massie <m...@cloudera.com>
Subject Re: Error in Cluster Startup: NameNode is not formatted
Date Fri, 26 Jun 2009 20:31:07 GMT

You didn't do anything stupid.  I've forgotten to format a NameNode  
too myself.

If you check the QuickStart guide at http://hadoop.apache.org/core/docs/current/quickstart.html

  you'll see that formatting the NameNode is the first of the  
Execution section (near the bottom of the page).

The command to format the NameNode is:

hadoop namenode -format

A warning though, you should only format your NameNode once.  Just  
like formatting any filesystem, you can loss data if you (re)format.

Good luck.


On Jun 26, 2009, at 1:25 PM, Boyu Zhang wrote:

> 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

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