On Fri, Oct 8, 2010 at 2:12 AM, Peter Schuller <peter.schul...@infidyne.com> wrote: >> If your C* process dies and/or is killed you should not lose data. It's >> written to the commit log before the client is acked, however that entry may >> not have made it to disk yet in the case of commitlogsync=periodic. So, if >> you kill the C* process you're fine. If you nicely restart the OS, you >> should be fine (assuming your boxen/raid controllers/disks/etc do the sane >> thing). If you nuke your OS, then see above about losing data on CL.ONE. > > Being fine in case of killing Cassandra does depend though on > Cassandra still guaranteeing that it write():s to the fd prior to ack > even in periodic mode. I haven't checked, but I sort of took the > default position of assuming it did not unless otherwise specified. > > If it does, and if this is an intended guarantee, that's great (and > I'll happily submit a patch to make this explicit in docs/comments). > Can anyone confirm/deny that this is an intended guarantee?
It is not. -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
