I assume the server also needs to be stopped while your are swapping files, but what about if you have a cluster of several servers and need to restore. Is the process to shutdown all the servers, move the files and restart? Or can you you do it one at a time. (I assume one at a time might mean a lot of read-repair work happening, so not a good idea).
Also, is it best to flush_binary (which I think flushes in memory tables to disk), and compact prior to snapshotting? -Anthony On Mon, Oct 05, 2009 at 08:09:48AM -0500, Jonathan Ellis wrote: > bin/nodeprobe snapshot > > to restore, move the snapshot sstables from the snapshot location to > the live data location (e.g. with dsh). > > note that the 0.4 branch, which will become 0.4.1, automatically > flushes each columnfamily when you ask for a snapshot of the table, so > you don't have to do that manually anymore. > > On Mon, Oct 5, 2009 at 8:05 AM, Joe Van Dyk <joevan...@gmail.com> wrote: > > How do you take the snapshot? What's the restore process? > > > > On Mon, Oct 5, 2009 at 5:22 AM, Jonathan Ellis <jbel...@gmail.com> wrote: > >> You can take a snapshot and either leave it in place indefinitely or > >> throw it into your existing backup ecosystem. That's your best option > >> for backup no matter which kind of partitioner you're using. > >> > >> -Jonathan > >> > >> On Mon, Oct 5, 2009 at 12:52 AM, Edmond Lau <edm...@ooyala.com> wrote: > >>> For folks who are using or considering using cassandra in their > >>> production systems, what do you use for backups? > >>> > >>> With HBase, one could potentially write a mapreduce to perform a row > >>> scan of the entire table (restricted to some historical timestamp to > >>> get a consistent view) and export the data to hdfs. With Cassandra, > >>> if you're using an ordered partitioner, a similar mechanism could be > >>> built over a key range scan. > >>> > >>> With a random partitioner, though, there's no api to iterate through > >>> all existing keys. Why not? > >>> > >>> Edmond > >>> > >> > > > > > > > > -- > > Joe Van Dyk > > http://fixieconsulting.com > > -- ------------------------------------------------------------------------ Anthony Molinaro <antho...@alumni.caltech.edu>
