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HDFS >> mail # user >> Recover dfs/name


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Re: Recover dfs/name
If /tmp/hadoop-user/dfs/namesecondary doesn't exist now, then yes, you
need to start over. Try keeping multiple copies and on a location
thats off-/tmp (use dfs.name.dir config).

On Wed, Jun 5, 2013 at 3:53 PM, Han JU <[EMAIL PROTECTED]> wrote:
> Thanks Ted.
> In fact it's an experimental cluster so no checkpointing... and snn is
> running in the same machine as nn, so I think its copy of metadata is also
> deleted by my colleague ...
>
> Does this mean that I have no choice but format/start over my HDFS?
>
>
> 2013/6/5 Ted Xu <[EMAIL PROTECTED]>
>>
>> Hi Han,
>>
>> HDFS metadata cannot be fully reconstructed by datanode report.
>>
>> If you have deployed a checkpoint node/secondary namenode, you can copy
>> the metadata to namenode and restart. This could recover most of the
>> metadata.
>>
>>
>> On Wed, Jun 5, 2013 at 5:30 PM, Han JU <[EMAIL PROTECTED]> wrote:
>>>
>>> Hi,
>>>
>>> The folder /tmp/hadoop-user/dfs/name is accidentally deleted by a
>>> colleague (along with all other things in this directory), is there any
>>> means to recover this directory?
>>> I know the directory where dfs is located in every datanode. Can I
>>> reconstruct the deleted files without formatting the hdfs?
>>>
>>> Thanks!
>>>
>>> --
>>> JU Han
>>>
>>> Software Engineer Intern @ KXEN Inc.
>>> UTC   -  Université de Technologie de Compiègne
>>>      GI06 - Fouille de Données et Décisionnel
>>>
>>> +33 0619608888
>>
>>
>>
>>
>> --
>> Regards,
>> Ted Xu
>
>
>
>
> --
> JU Han
>
> Software Engineer Intern @ KXEN Inc.
> UTC   -  Université de Technologie de Compiègne
>      GI06 - Fouille de Données et Décisionnel
>
> +33 0619608888

--
Harsh J