Thanks guys for updating! Yeah, I read the thread that Checkpoint/BackupNode may be get deprecated. SNN is a way to go then.
I just wonder if we use multiple CheckpointNodes, we might run into the situation where while a checkpoint is on-going, but the first CheckpointNode is slow, then the second checkpointNode kicks in, just wonder what would happen. On Thu, Apr 18, 2013 at 3:07 PM, Mohammad Tariq <donta...@gmail.com> wrote: > 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 <decho...@gmail.com>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 <than...@cs.wisc.edu> 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 < >>> dwivedishash...@gmail.com> 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 <than...@cs.wisc.edu> 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 >> > >
