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Hadoop, mail # user - How to recover a namenode?


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ChingShen 2010-09-17, 06:58
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ChingShen 2010-09-17, 08:36
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Allen Wittenauer 2010-09-17, 15:59
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Re: How to recover a namenode?
Boris Shkolnik 2010-09-22, 00:29
You may want to check importcheckpoint option too
http://hadoop.apache.org/hdfs/docs/current/hdfs_user_guide.html#Import+Checkpoint

Boris.

On 9/17/10 1:36 AM, "ChingShen" <[EMAIL PROTECTED]> wrote:

I think I got it!

Step by step as following:

 1. put two files into hdfs.
 2. kill -9 ${namenode_pid}.
 3. delete the whole ${hadoop.tmp.dir}/dfs directory of NN.
 4. copy the dfs directory of BN to NN.
 5. start-up NN.

It works. Is it correct?

Shen
On Fri, Sep 17, 2010 at 2:58 PM, ChingShen <[EMAIL PROTECTED]> wrote:

> Hi all,
>
>   I have a Backup Node (BN) and a active NameNode (NN), but if NN failed,
> how to recover the NN? Is possible BN replace NN directly? Any resources?
>
> Shen
>