Your reasoning is absolutely correct. The Namenode writes its metadata to
all these directories. This setting automatically replicates the Namenode
metadata to multiple locations.
Sent: Friday, November 24, 2006 5:58 AM
Subject: Can I set more than one dfs.name.dir?
I found that I can set more than one dfs.name.dir in hadoop-site.xml
<description>Determines where on the local filesystem the NDFS name
should store the name table.</description>
Does this mean I have a backup of my namenode info? Or this is for some
other special reasons?