Thanks guys, this is what I was looking for. @Edward. I definitely like crazy ideas ;), I think the only issue here is that C* is a disk space hug, so not sure if that would be feasible since free RAM is not as abundant as disk. BTW, I watched your presentation, are you guys still using C* as in-memory store?
On Mar 6, 2013, at 7:44 AM, Edward Capriolo <edlinuxg...@gmail.com> wrote: > 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 >>> >>> >>> >>> 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 >>>> >>>> >>> >> > >
