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From Nigel Daley <nda...@yahoo-inc.com>
Subject Re: Incompatible namespaceIDs
Date Mon, 11 Jun 2007 04:30:12 GMT
This is a known issue:
http://issues.apache.org/jira/browse/HADOOP-1212

Nige

On Jun 8, 2007, at 5:35 PM, Bwolen Yang wrote:

> Looks like this problem is not related to the upgrade, but a  
> problem in 0.13.0.
> Basically if I were to delete all the dfs directories and reformat,
> the datanodes come up ok.  however, if I were to reformat again, the
> datanodes won't be able to come up due to the exception mentioned
> below.
>
> bwolen
>
> On 6/8/07, Bwolen Yang <wbwolen@gmail.com> wrote:
>> Hi.
>>
>> Upgrading from 0.12.3 to 0.13 seems to work fine.  (at least the
>> before and after "fsck "and "dfs -lsr" outputs matches).
>>
>> Then I shut down the DFS cluster, and reformat the DFS (to start a  
>> new
>> round of performance test).   The datanodes all have the following
>> exception.
>>
>>   2007-06-08 17:13:27,985 ERROR org.apache.hadoop.dfs.DataNode:
>> java.io.IOExceptio
>> n: Incompatible namespaceIDs in /mnt/hadoop/bwolen/dfs/data: namenode
>> namespaceID = 1399119814; datanode namespaceID = -1646824738
>>
>> I'll blow away these directories and start from scratch.  Just  
>> thought
>> to let you know.
>>
>> bwolen
>>


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