Okay I will try deleting the bucket and creating and then setting replicas to zero
But on the "read" performance : 22,000 records /second: does that seem low? This number drops to 14,000 with 2 nodes: does that number seem low? On Thursday, January 30, 2014 8:35:11 PM UTC, Aliaksey Kandratsenka wrote: > > > On Jan 30, 2014 12:32 PM, "asdf9898" <[email protected] <javascript:>> > wrote: > > > > Hi: when I have two nodes: how do I disable replicas ? > > > > Replication is enabled and I cannot un-tick the option. > > > > And I cannot change the number of replicas from 1 to 0 > > Feel free to recreate bucket. > > But I believe your problem is more on client side. Your numbers look too > small and thus there's not much reason to expect large speedup with more > nodes. IMO > > > > Thanks > > > > > > On Wednesday, January 29, 2014 8:22:57 PM UTC, asdf9898 wrote: > >> > >> Thanks Guys, > >> > >> I have a Windows machine with 4GB and a Windows machine with 8GB RAM. > >> Both have 4 cpus. Regular hard drive. > >> > >> The total bucket in the cluster is 2x2GB. > >> > >> I'm loading 50,000 records which takes up maybe 100MB > >> > >> The insert time is between 5000 and 6000 records per second. > >> A single node will give 6000 records but when two nodes I get just 5000 > >> > >> A single node can read back approx 22,000 records /s > >> With two nodes I get maybe 14,000. This increased to 15,000 when I > added the second URI of the second machine in the CouchbaseClient config. > >> And increased to maybe 16,000 when I increased client threads to 32 > >> > >> I'm using the YCSB yahoo benchmark program. > >> > >> But I have found that using Elasticsearch 5 nodes on one machine and > Hazelcast two nodes on one machine also causes a drop in throughput > compared to a single node. > >> > >> By the way are you saying turning off replication could give a > performance increase? That could be the problem? > >> > >> Regards, > >> > >> On Wednesday, January 29, 2014 7:46:33 PM UTC, Aliaksey Kandratsenka > wrote: > >>> > >>> > >>> > >>> > >>> On Wed, Jan 29, 2014 at 11:00 AM, asdf9898 <[email protected]> > wrote: > >>>> > >>>> Hello > >>>> > >>>> I am new to nosql in general and would like some advice on couchbase > and other similar technologies. > >>>> > >>>> I have done some performance testing of a number of technologies and > find the same results with each. > >>>> > >>>> When I do x inserts on a single node I get better performance than > when I add a second node. > >>>> > >>>> Read-performance is much better than insert performance but again a > single node performs better than 2 nodes. > >>>> > >>>> I then thought that if I add the URIs in the buildConnection > >>>> > >>>> URI server = new URI(addresses); > >>>> ArrayList<URI> serverList = new ArrayList<URI>(); > >>>> serverList.add(server); > >>>> CouchbaseClient client = new CouchbaseClient( > >>>> serverList, "default", ""); > >>>> > >>>> In other words by explicitly telling the client about the second node > it should cause double performance but sadly I just got maybe an extra 10% > >>>> > >>>> I then thought if I double the number of client threads because I now > have two servers to target it would double performance but again no: just a > slight increase. > >>>> > >>>> So in summary : would adding an extra node cause an increase or > decrease in throughput (both reading and inserts) ? > >>> > >>> > >>> Should increase (modulo tap load as Matt mentions). But in testing it, > make sure that you don't jump to conclusions too quickly. I.e. when testing > scalability I'd recommend looking at possible client-side contention too. > I.e. if you have single client doing sequential ops, it obviously won't > matter if you have 1 node or 100 nodes. All details matter. > >>> > > -- > > You received this message because you are subscribed to the Google > Groups "Couchbase" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "Couchbase" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
