How does giving the SSD node a higher number of tokens help anything if it's a 3 node cluster with 3 replicas?
On Wed, Mar 5, 2014 at 3:41 PM, Tyler Hobbs <ty...@datastax.com> wrote: > The dynamic snitch wraps whatever snitch you configure (SimpleSnitch, > PropertyFileSnitch, etc). > > The dynamic snitch *will* favor faster replicas, but it might still > under-utilize the SSD nodes. Chris's suggestion to give the SSD nodes a > higher number of tokens will result in them being replicas for a larger > portion of the data, so you may still want to do that. > > > On Wed, Mar 5, 2014 at 4:29 PM, Russell Bradberry <rbradbe...@gmail.com>wrote: > >> Are you using the dynamic snitch? Because the SimpleSnitch is the default. >> >> >> >> On March 5, 2014 at 5:27:03 PM, Elliot Finley (efinley.li...@gmail.com) >> wrote: >> >> Keep in mind, for this 3 node cluster, N = 3. >> >> I did a bit more digging and I found this (for future searches on this >> topic): >> >> http://www.datastax.com/documentation/cassandra/2.0/cassandra/architecture/architectureSnitchDynamic_c.html >> >> http://www.datastax.com/dev/blog/dynamic-snitching-in-cassandra-past-present-and-future >> >> So, according to this, if I'm reading it right, the SSD node WILL take >> the majority of reads. >> >> Any comments welcome. >> >> >> >> On Wed, Mar 5, 2014 at 10:04 AM, Chris Burroughs < >> chris.burrou...@gmail.com> wrote: >> >>> No. If you have a heterogeneous clusters you should consider adjusting >>> the number of vnodes per physical node. >>> >>> >>> On 03/04/2014 10:47 PM, Elliot Finley wrote: >>> >>>> Using Cassandra 2.0.x >>>> >>>> If I have a 3 node cluster and 2 of the nodes use spinning drives and 1 >>>> of >>>> them uses SSD, will the majority of the reads be routed to the SSD node >>>> automatically because it has faster responses? >>>> >>>> TIA, >>>> Elliot >>>> >>>> >>> >> > > > -- > Tyler Hobbs > DataStax <http://datastax.com/> >
