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From Steve Gao <steve....@yahoo.com>
Subject What's different of 1)namenode metadata 2)image and 3)edit logs?
Date Mon, 16 Nov 2009 20:45:56 GMT
What are the differences between the 3 concepts: (1) namenode metadata, (2) namenode image,
and (3) edit logs?

BTW,I know the secondary namenode backups namenode data. 

I was told that there is another daemon which also backups meta data . Is that true? What
is the daemon? Thanks.

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