Re: Checkpoint vs Backup Node
Thanks for the response. Well the hanging of BN and its consequences seem to be a scary situation. So when using a CN, in case of a NN failure...we would loose the edits after the last checkpoint, but it seems to be a decent trade-off for the stability which the Backup Node might lack. On Tue, May 24, 2011 at 6:12 PM, Todd Lipcon t...@cloudera.com wrote: Hi Sulabh, Neither of these nodes have been productionized -- so I don't think anyone would have a good answer for you about what works in production. They are only available in 0.21 and haven't had any substantial QA. One of the potential issues with the BN is that it can delay the logging of edits by the primary NN, if the BN were to hang or go offline. The CN would not have such an issue. -Todd On Tue, May 24, 2011 at 5:08 PM, sulabh choudhury sula...@gmail.com wrote: As far as my understanding goes, I feel that Backup node is much more efficient then the Checkpoint node, as it has the current(up-to-date) copy of file system too. I do not understand what would be the use case (in a production environment) tin which someone would prefer Checkpoint node over Backup node, or I should ask, what do people generally prefer of the two and why ? -- Todd Lipcon Software Engineer, Cloudera
Checkpoint vs Backup Node
As far as my understanding goes, I feel that Backup node is much more efficient then the Checkpoint node, as it has the current(up-to-date) copy of file system too. I do not understand what would be the use case (in a production environment) tin which someone would prefer Checkpoint node over Backup node, or I should ask, what do people generally prefer of the two and why ?
Re: Checkpoint vs Backup Node
Hi Sulabh, Neither of these nodes have been productionized -- so I don't think anyone would have a good answer for you about what works in production. They are only available in 0.21 and haven't had any substantial QA. One of the potential issues with the BN is that it can delay the logging of edits by the primary NN, if the BN were to hang or go offline. The CN would not have such an issue. -Todd On Tue, May 24, 2011 at 5:08 PM, sulabh choudhury sula...@gmail.com wrote: As far as my understanding goes, I feel that Backup node is much more efficient then the Checkpoint node, as it has the current(up-to-date) copy of file system too. I do not understand what would be the use case (in a production environment) tin which someone would prefer Checkpoint node over Backup node, or I should ask, what do people generally prefer of the two and why ? -- Todd Lipcon Software Engineer, Cloudera
