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From Raghu Angadi <rang...@yahoo-inc.com>
Subject Re: Thinking about retriving DFS metadata from datanodes!!!
Date Mon, 08 Sep 2008 16:52:59 GMT

There is certainly value in it. But it can not be done with the data 
datanodes currently have.

The usual way to protect NameNode metadata in Hadoop is to write the 
metadata to two different locations.

Raghu.

叶双明 wrote:
> Hi all.
> 
> We all know the importance of NameNode for a cluster, when the NameNode
> whith all matadata of the DFS is breaked down,  the whole of the
> clustes'data is gone.
> 
> So, if we can retrive DFS metadata from datanodes, It should be a additional
> great robustness for hadoop.
> 
> Does any one thinking It's valuable for it?
> 


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