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MapReduce, mail # user - rack topology data update


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Re: rack topology data update
Viji R 2012-09-13, 05:55
Hi Jameson,

If the NameNode has cached the wrong value earlier, it will not
refresh that until you restart it.

On Thu, Sep 13, 2012 at 11:21 AM, Jameson Li <[EMAIL PROTECTED]> wrote:
> Hi harsh,
>
> I have followed your suggestion operation.
>
> 1, stop the new datanode.(I have modified the topology file in the namenode
> before.)
> 2, run 'hadoop dfsadmin -refreshNodes' on the namenode
> 3, start the new datanode.
>
> But it really not update the new topology mapping.
> It just show the start info in the namenode that:
> "
> 2012-09-13 13:44:14,706 INFO org.apache.hadoop.net.NetworkTopology: Removing
> a node: /default-rack/10.0.10.100:50010
> 2012-09-13 13:44:14,706 INFO org.apache.hadoop.net.NetworkTopology: Adding a
> new node: /default-rack/10.0.10.100:50010
> "
>
>
> 专注于Mysql,MSSQL,Oracle,Hadoop
>
>
>
> 2012/9/13 Harsh J <[EMAIL PROTECTED]>
>>
>> the DN only after (2) so it picks up the right mapping an
>
>