On Jan 30, 2014 12:32 PM, "asdf9898" <[email protected]> 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]. > 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.
