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MapReduce >> mail # user >> why multiple checkpoint nodes?


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Re: why multiple checkpoint nodes?
Hello Thanh,

       Just to keep you updated, checkpoint node might get depricated. So,
it's always better to use secondary namenode. More on this could be found
here :
https://issues.apache.org/jira/browse/HDFS-2397
https://issues.apache.org/jira/browse/HDFS-4114

Warm Regards,
Tariq
https://mtariq.jux.com/
cloudfront.blogspot.com
On Fri, Apr 19, 2013 at 1:15 AM, Bertrand Dechoux <[EMAIL PROTECTED]>wrote:

> It would be important to point the document (which I believe is
> http://hadoop.apache.org/docs/stable/hdfs_user_guide.html) and the
> version of Hadoop you are interested in. At one time, the documentation was
> misleading. The 1.x version didn't have checkpoint/backup nodes only the
> secondary namenode. I don't believe it has changed but I might be wrong (or
> the documentation still hasn't been fixed). The 2.x version will have
> namenode HA which will be the final solution.
>
> Regards
>
> Bertrand
>
>
> On Thu, Apr 18, 2013 at 7:20 PM, Thanh Do <[EMAIL PROTECTED]> wrote:
>
>> so reliability (to prevent metadata loss) is the main motivation for
>> multiple checkpoint nodes?
>>
>> Does anybody use multiple checkpoint nodes in real life?
>>
>> Thanks
>>
>>
>> On Thu, Apr 18, 2013 at 12:07 PM, shashwat shriparv <
>> [EMAIL PROTECTED]> wrote:
>>
>>> more checkpoint nodes means more backup of the metadata :)
>>>
>>> *Thanks & Regards    *
>>>
>>> ∞
>>> Shashwat Shriparv
>>>
>>>
>>>
>>> On Thu, Apr 18, 2013 at 9:35 PM, Thanh Do <[EMAIL PROTECTED]> wrote:
>>>
>>>> Hi all,
>>>>
>>>> The document says "Multiple checkpoint nodes may be specified in the
>>>> cluster configuration file".
>>>>
>>>> Can some one clarify me that why we really need to run multiple
>>>> checkpoint nodes anyway? Is it possible that while checkpoint node A is
>>>> doing checkpoint, and check point node B kicks in and does another
>>>> checkpoint?
>>>>
>>>> Thanks,
>>>> Thanh
>>>>
>>>
>>>
>>
>
>
> --
> Bertrand Dechoux
>