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From Jameson Li <hovlj...@gmail.com>
Subject Re: rack topology data update
Date Thu, 13 Sep 2012 07:19:21 GMT
Hi  Harsh J,  Viji R,  Saurabh bhutyani,

Thanks for all of yours replying.

But really the namenode not refresh the rack info.

Is my hadoop version issue? My hadoop version is base on
hadoop-0.20-append, and have 4 patches on it that I think they are really
no matter with the rack awareness.

If anytime I add new nodes, and I should restart namenode to refresh the
rack info, I will crazy...

专注于Mysql,MSSQL,Oracle,Hadoop


2012/9/13 Saurabh bhutyani <s4saurabh@gmail.com>

> I believe running the following command on namenode should refresh it.
>
> 'hadoop dfsadmin -refreshNodes'
>
> Thanks & Regards,
> Saurabh Bhutyani
>
> Call  : 9820083104
> Gtalk: s4saurabh@gmail.com
>
>
>
>
> On Thu, Sep 13, 2012 at 11:25 AM, Viji R <viji@cloudera.com> wrote:
>
>> 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 <hovlj.ei@gmail.com> 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 <harsh@cloudera.com>
>> >>
>> >> the DN only after (2) so it picks up the right mapping an
>> >
>> >
>>
>
>

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