Re: Cassandra cluster: could not reach linear scalability

Thanks for your help, I'been biased with Cassandra server and forget about the client completely! Sent using Zoho Mail On Mon, 19 Feb 2018 15:21:03 +0330 Lucas Benevides lu...@maurobenevides.com.br wrote Why did you set the number of 1000 threads? Does it show to be the

Re: Cassandra cluster: could not reach linear scalability

Why did you set the number of 1000 threads? Does it show to be the more performatic when threads = auto? I have used stress tool in a larger test bed (10 nodes) and my optimal setup was 24 threads. To check this you must monitor the stress node, both the CPU and I/O. And give it a try with fewer

Re: Cassandra cluster: could not reach linear scalability

If that is the case you could also try to run more stress from another machine as well. -- Rahul Singh rahul.si...@anant.us Anant Corporation On Feb 18, 2018, 2:37 PM -0500, Jeff Jirsa , wrote: > Stress client may be cpu bound as well > > -- > Jeff Jirsa > > > On Feb 18,

Re: Cassandra cluster: could not reach linear scalability

Stress client may be cpu bound as well -- Jeff Jirsa > On Feb 18, 2018, at 7:40 AM, onmstester onmstester > wrote: > > I'm running tests on separate machine (not member of the cluster) > I'm using the default data model of cassandra-stress tool : keyspace1 and > table:

Re: Cassandra cluster: could not reach linear scalability

I'm running tests on separate machine (not member of the cluster) I'm using the default data model of cassandra-stress tool : keyspace1 and table: standard1. nothing special on network or data traffic. Network capable of 1 G and tested it with ipperf. iftop shows maximum of 48Mbit traffic

Re: Cassandra cluster: could not reach linear scalability

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.

Re: Cassandra cluster: could not reach linear scalability

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 rahul.xavier.si...@gmail.com wrote You don’t don’t have enough memory. That’s just a start. -- Rahul

Re: Cassandra cluster: could not reach linear scalability

You don’t don’t have enough memory. That’s just a start. -- Rahul Singh rahul.si...@anant.us Anant Corporation On Feb 18, 2018, 6:29 AM -0500, onmstester onmstester , wrote: > I've configured a simple cluster using two PC with identical spec: > cpu core i5 > RAM: 8GB

Cassandra cluster: could not reach linear scalability

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