http://www.slideshare.net/edwardcapriolo/cassandra-as-memcache
Read at ONE. READ_REPAIR_CHANCE as low as possible. Use short TTL and short GC_GRACE. Make the in memory memtable size as high as possible to avoid flushing and compacting. Optionally turn off commit log. You can use cassandra like memcache but it is not a memcache replacement. Cassandra persists writes and compacts SSTables, memcache only has to keep data in memory. If you want to try a crazy idea. try putting your persistent data on a ram disk! Not data/system however! On Wed, Mar 6, 2013 at 2:45 AM, aaron morton <aa...@thelastpickle.com>wrote: > consider disabling durable_writes in the KS config to remove writing to > the commit log. That will speed things up for you. Note that you risk > losing data is cassandra crashes or is not shut down with nodetool drain. > > Even if you set the gc_grace to 0, deletes will still need to be committed > to disk. > > Cheers > > ----------------- > Aaron Morton > Freelance Cassandra Developer > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 5/03/2013, at 9:51 AM, Drew Kutcharian <d...@venarc.com> wrote: > > Thanks Ben, that article was actually the reason I started thinking about > removing memcached. > > I wanted to see what would be the optimum config to use C* as an in-memory > store. > > -- Drew > > > On Mar 5, 2013, at 2:39 AM, Ben Bromhead <b...@instaclustr.com> wrote: > > Check out > http://techblog.netflix.com/2012/07/benchmarking-high-performance-io-with.html > > Netflix used Cassandra with SSDs and were able to drop their memcache > layer. Mind you they were not using it purely as an in memory KV store. > > Ben > Instaclustr | www.instaclustr.com | > @instaclustr<http://twitter.com/instaclustr> > > > > On 05/03/2013, at 4:33 PM, Drew Kutcharian <d...@venarc.com> wrote: > > Hi Guys, > > I'm thinking about using Cassandra as an in-memory key/value store instead > of memcached for a new project (just to get rid of a dependency if > possible). I was thinking about setting the replication factor to 1, > enabling off-heap row-cache and setting gc_grace_period to zero for the CF > that will be used for the key/value store. > > Has anyone tried this? Any comments? > > Thanks, > > Drew > > > > > >
