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From Raghu Angadi <rang...@yahoo-inc.com>
Subject Re: Thinking about retriving DFS metadata from datanodes!!!
Date Wed, 10 Sep 2008 06:11:41 GMT

The main problem is the complexity of maintaining accuracy of the 
metadata. In other words, what you think is the cost?

Do you think writing fsimage to multiple places helps with the terrorist 
attack? It is supported even now.

叶双明 wrote:
> Thanks for paying attention  to my tentative idea!
> What I thought isn't how to store the meradata, but the final (or last) way
> to recover valuable data in the cluster when something worst (which destroy
> the metadata in all multiple NameNode) happen. i.e. terrorist attack  or
> natural disasters destroy half of cluster nodes within all NameNode, we can
> recover as much data as possible by this mechanism, and hava big chance to
> recover entire data of cluster because fo original replication.
> Any suggestion is appreciate!

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