-Re: why multiple checkpoint nodes?
Bertrand Dechoux 2013-04-18, 19:45
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.
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?
> 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