FAQ
Your reasoning is absolutely correct. The Namenode writes its metadata to
all these directories. This setting automatically replicates the Namenode
metadata to multiple locations.

Thanks,
dhruba

-----Original Message-----
From: arale.jianglei@gmail.com
Sent: Friday, November 24, 2006 5:58 AM
To: hadoop-dev@lucene.apache.org
Subject: Can I set more than one dfs.name.dir?

Hi all:
I found that I can set more than one dfs.name.dir in hadoop-site.xml
like below:
<property>
<name>dfs.name.dir</name>
<value>/opt/hadoop/dfs/name1</value>
<value>/opt/..../name2</value>
<description>Determines where on the local filesystem the NDFS name
node
should store the name table.</description>
</property>

Does this mean I have a backup of my namenode info? Or this is for some
other special reasons?

Best Regards,

Jianglei
2006-11-24

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