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From Harsh J <ha...@cloudera.com>
Subject Re: incompatible cluster ID - SOLUTION
Date Tue, 06 Nov 2012 15:09:28 GMT
Hey Andy,

We also have a FAQ wiki page at http://wiki.apache.org/hadoop/FAQ you
can send these kind of things to. Let me know your Apache Hadoop Wiki
user-ID (you can sign up there), and we'll grant you edit rights.

On Tue, Nov 6, 2012 at 8:06 PM, Kartashov, Andy <Andy.Kartashov@mpac.ca> wrote:
> Hello,
> Whenever you are getting below error, trying to start a DN on a slave machine:
>  java.io.IOException: Incompatible clusterIDs in /home/hadoop/dfs/data: namenode clusterID
= ****; datanode clusterID = ****
> It is because after you set up your cluster, you, for whatever reason, decided to reformat
your NN. Your DNs on slaves still bear reference to the old NN. To resolve this simply delete
and recreate data folder on that machine in local Linux FS, namely /home/hadoop/dfs/data.
Restarting that DN's daemon on that machine will recreate data/ folder's content and resolve
the problem.
> Happy Hadooping,
> AK47
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Harsh J

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