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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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
