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From 李洪忠 <lhz...@hotmail.com>
Subject Re: Adding new name node location
Date Wed, 17 Apr 2013 07:17:53 GMT
modify conf file and restart name node is the best way. you needn't 
restart the cluster DFS.
the files in /backup and /home are the same.
于 2013/4/17 14:38, Henry Hung 写道:
>
> Hi Varun Kumar,
>
> Could  you be more elaborate about how the new changes being made to 
> new name node?
>
> The scenario in my mind is:
>
> Suppose old name node metadata contains 100 hdfs files.
>
> Then I restart by using stop-dfs, change config and start-dfs.
>
> Hadoop will automatically create new name node directory in /backup.
>
> Now I have one old name node that have metadata of 100 hdfs files and 
> new name node that have none metadata.
>
> I put a new file into hdfs, the old name node will have 101 and new 
> name node will have 1.
>
> Best regards,
>
> Henry
>
> *From:*varun kumar [mailto:varun.uid@gmail.com]
> *Sent:* Wednesday, April 17, 2013 2:18 PM
> *To:* user
> *Cc:* MA11 YTHung1
> *Subject:* Re: Adding new name node location
>
> Hi Henry,
>
> As per your mail Point number 1 is correct.
>
> After doing these changes metadata will be written in the new partition.
>
> Regards,
>
> Varun Kumar.P
>
> On Wed, Apr 17, 2013 at 11:32 AM, Henry Hung <YTHung1@winbond.com 
> <mailto:YTHung1@winbond.com>> wrote:
>
> Hi Everyone,
>
> I’m using Hadoop 1.0.4 and only define 1 location for name node files, 
> like this:
>
> <property>
>
> <name>dfs.name.dir</name>
>
> <value>/home/hadoop/hadoop-data/namenode</value>
>
> </property>
>
> Now I want to protect my name node files by changing the configuration to:
>
> <property>
>
> <name>dfs.name.dir</name>
>
> <value>/home/hadoop/hadoop-data/namenode,/backup/hadoop/hadoop-data/namenode</value>
>
> </property>
>
> Where /backup is another mount point. This /backup can be another disk 
> or from another NFS server.
>
> My question are:
>
> 1.Is my procedure correct: do stop-dfs.sh then modify conf, and last 
> start-dfs.sh?
>
> 2.If answer to no 1 is no, then could you provide the correct procedure?
>
> 3.Would the new name node files will auto copy the original name node 
> files?
>
> Best regards,
>
> Henry
>
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>
> -- 
>
> Regards,
>
> Varun Kumar.P
>
>
> ------------------------------------------------------------------------
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