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From Raghu Angadi <rang...@yahoo-inc.com>
Subject Re: Upgrade of DFS - Urgent
Date Fri, 01 Jun 2007 06:23:06 GMT

This is the result of HADOOP-1242. I prefer if it did not require 
presence of this image directory.

For now you could manually create image/fsimage file in name/ directory. 
If you write random 4 bytes to fsimage, you have 50% chance of success. 
Basically readInt() from the file should be less than -3. Only first 4 
bytes are important.


Dennis Kubes wrote:
> All,
> I upgraded to the most recent trunk of Hadoop and I started getting the 
> error below, where /d01/hadoop/dfs/name is our namenode directory:
> org.apache.hadoop.dfs.InconsistentFSStateException: Directory 
> /d01/hadoop/dfs/name is in an inconsistent state: 
> /d01/hadoop/dfs/name/image does not exist.
> The old configuration was under a directory structure like:
> /d01/hadoop/dfs/name/current
> After backup up the namenode and playing around a little I found that if 
> I reformatted the namenode and then copied over the old files that were 
> in the current directory back into the "new" current directory that the 
> namenode would start up.
> We have quite a bit of data on this cluster (around 8T) and I am a 
> little nervous about starting up the entire cluster without a little 
> clarification.  If I startup the cluster now, will any old data blocks 
> be deleted or will those data blocks remain because I copied over the 
> old configuration files into the new "current"?
> Is there another way to upgrade this DFS cluster?  Any help is appreciated.
> Dennis Kubes

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