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From: Harsh J <harsh@cloudera.com>
Date: Mon, 19 May 2014 15:52:08 +0530
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Subject: Re: about hadoop upgrade
To: "<user@hadoop.apache.org>" <user@hadoop.apache.org>
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Backing up one of them is sufficient, but do check if both their
contents are same and backup the more recent one (a mount may lag
behind if it had a failure earlier, for ex.).

On Mon, May 19, 2014 at 3:39 PM, ch huang <justlooks@gmail.com> wrote:
> hi,maillist:
>         i want to upgrade my cluster ,in doc,one of step is backup namenode
> dfs.namenode.name.dir directory,i have 2 directories defined in
> hdfs-site.xml,should i backup them all ,or just one of them?
>
>     <property>
>         <name>dfs.namenode.name.dir</name>
>         <value>file:///data/namespace/1,file:///data/namespace/2</value>
>     </property>



-- 
Harsh J