Got it. Here are some other questions.
Are you running the test on separate machine or one of the cluster members? When configuring Cassandra stress what data model did you end up using? ( do you see Data or traffic skew?) Do you see any wide partitions or Tombstone warnings on either node. Have you visualized the GC logs using something like VisualVM or hubspots GC visualizer? This is to see if there are chokepoints in the GC cycle. -- Rahul Singh [email protected] Anant Corporation On Feb 18, 2018, 9:23 AM -0500, onmstester onmstester <[email protected]>, wrote: > But monitoring cassandra with jmx using jvisualVM shows no problem, less than > 30% of heap size used > > Sent using Zoho Mail > > > ---- On Sun, 18 Feb 2018 17:26:59 +0330 Rahul Singh > <[email protected]> wrote ---- > > > You don’t don’t have enough memory. That’s just a start. > > > > -- > > Rahul Singh > > [email protected] > > > > Anant Corporation > > > > On Feb 18, 2018, 6:29 AM -0500, onmstester onmstester > > <[email protected]>, wrote: > > > > > I've configured a simple cluster using two PC with identical spec: > > > cpu core i5 > > > RAM: 8GB ddr3 > > > Disk: 1TB 5400rpm > > > Network: 1 G (I've test it with iperf, it really is!) > > > > > > using the common configs described in many sites including datastax > > > itself: > > > cluster_name: 'MyCassandraCluster' > > > num_tokens: 256 > > > seed_provider: > > > - class_name: org.apache.cassandra.locator.SimpleSeedProvider > > > parameters: > > > - seeds: "192.168.1.1,192.168.1.2" > > > listen_address: > > > rpc_address: 0.0.0.0 > > > endpoint_snitch: GossipingPropertyFileSnitch > > > > > > Running stress tool: > > > cassandra-stress write n=1000000 -rate threads=1000 -mode native cql3 > > > -node 192.168.1.1,192.168.1.2 > > > > > > Over each node it shows 39 K writes/seconds, but running the same stress > > > tool command on cluster of both nodes shows 45 K writes/seconds. I've > > > done all the tuning mentioned by apache and datastax. There are many use > > > cases on the net proving Cassandra linear Scalability So what is wrong > > > with my cluster? > > > > > > Sent using Zoho Mail > > > > >
