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From Edward Capriolo <edlinuxg...@gmail.com>
Subject Re: what will happen if a backup name node folder becomes unaccessible?
Date Fri, 20 Aug 2010 21:10:38 GMT
On Fri, Aug 20, 2010 at 4:56 PM, jiang licht <licht_jiang@yahoo.com> wrote:
> Using nfs folder to back up dfs meta information as follows,
> <property>
>         <name>dfs.name.dir</name>
>         <value>/hadoop/dfs/name,/hadoop-backup/dfs/name</value>
>     </property>
> where /hadoop-backup is on a backup machine and mounted on the master node.
> I have a question: if somehow, the backup folder becomes unavailable, will it freeze
master node? That is, will write operation simply hang up on this condition on the master
node? Or will master node log the problem and continues to work?
> Thanks,
> Michael

Hadoop MUST be able to write and read from both directories. If it can
not the NameNode will shutdown and refuse to start again.

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