Hadoop Professionals

A Community for Hadoop Users

Incompatible namespaceIDs after formatting namenode

Hi,

We just started implementation of cloudera hadoop on our system for the first time. 

After reformatting a namenode for a few times, DataNode is not coming up with error "Incompatible namespaceIDs" 

I found a note http://pages.cs.brandeis.edu/~cs147a/lab/hadoop-troubleshooting/ but I'm really not sure about removing data node directories. 

How is it possible that data will not be erased (or it will do)?  

Please explain me how I can preserve the actual data along with reformat needs ?

10x

Tags: datanode, format, namenode

Views: 36

▶ Reply to This

Replies to This Discussion

Permalink Reply by Vikas Srivastava on January 28, 2012 at 11:09am

Hey ,

After Stopping cluster ,

Wat you have to do is delete the tmp/$hadoopuser directory and format the namenode.

Hope you get your problem solved

Regards

Vikas Srivastava

▶ Reply to Discussion

RSS




Groups

© 2012   Created by Jason Venner.

Badges  |  Report an Issue  |  Terms of Service

Sign in to chat!