Right. I don't personally think incremental backup is useful beyond restoring individual nodes unless none of your data happens to reference any other rows.
On Fri, Dec 7, 2012 at 11:37 AM, Andrey Ilinykh <ailin...@gmail.com> wrote: > That's right. But when I have incremental backup on each CF gets flushed > independently. I have "hot" CF which gets flushed every several minutes and > regular CF which gets flushed every hour or so. They have references to > each other and data in sstables is definitely inconsistent. > > > > On Fri, Dec 7, 2012 at 9:28 AM, Tyler Hobbs <ty...@datastax.com> wrote: > >> Snapshots trigger a flush first, so data that's currently in the commit >> log will be covered by the snapshot. >> >> >> On Thu, Dec 6, 2012 at 11:52 PM, Andrey Ilinykh <ailin...@gmail.com>wrote: >> >>> >>> >>> >>> On Thu, Dec 6, 2012 at 7:34 PM, aaron morton <aa...@thelastpickle.com>wrote: >>> >>>> For background >>>> >>>> >>>> http://wiki.apache.org/cassandra/Operations?highlight=%28snapshot%29#Consistent_backups<http://wiki.apache.org/cassandra/Operations?highlight=(snapshot)#Consistent_backups> >>>> >>>> If you it for a single node then yes there is a chance of inconsistency >>>> across CF's. >>>> >>>> If you have mulitple nodes the snashots you take on the later nodes >>>> will help. If you use CL QUOURM for reads you *may* be ok (cannot work it >>>> out quickly.). If you use CL ALL for reads you will be ok. Or you can use >>>> nodetool repair to ensure the data is consistent. >>>> >>>> I'm talking about restoring whole cluster, so all nodes are restored >>> from backup and all of them are inconsistent because they lost data from >>> commit logs. It doesn't matter what CL I use, some data may be lost. >>> Cassandra 1.1 supports commit log archiving >>> http://www.datastax.com/docs/1.1/configuration/commitlog_archiving >>> I think if I store both flushed sstables and commit logs it should >>> solve my problem. I'm wondering if someone has any experience with this >>> feature? >>> >>> Thank you, >>> Andrey >>> >> >> >> >> -- >> Tyler Hobbs >> DataStax <http://datastax.com/> >> >> > -- Tyler Hobbs DataStax <http://datastax.com/>
