Re: concurrent_compactors via JMX

2018-07-24 Thread Alain RODRIGUEZ
Hello Ricardo, My understanding is that GP2 is better. I think we did some testing in the past, but I must say I do not remember the exact results. I remember we also thought of IO1 at some point, but we were not convinced by this kind of EBS (not sure if it was not as performant as suggested in t

Re: concurrent_compactors via JMX

2018-07-19 Thread Riccardo Ferrari
Alain, I really appreciate your answers! A little typo is not changing the valuable content! For sure I will give a shot to your GC settings and come back with my findings. Right now I have 6 nodes up and running and everything looks good so far (at least much better). I agree, the hardware I am

Re: concurrent_compactors via JMX

2018-07-19 Thread Alain RODRIGUEZ
> Ah excuse my confusion. I now understand I guide you through changing the > throughput when you wanted to change the compaction throughput. Wow, I meant to say "I guided you through changing the compaction throughput when you wanted to change the number of concurrent compactors." I should not

Re: concurrent_compactors via JMX

2018-07-19 Thread Alain RODRIGUEZ
Ah excuse my confusion. I now understand I guide you through changing the throughput when you wanted to change the compaction throughput. I also found some commands I ran in the past using jmxterm. As mentioned by Chris - and thanks Chris for answering the question properly -, the 'max' can never

Re: concurrent_compactors via JMX

2018-07-18 Thread Riccardo Ferrari
Chris, Thank you for mbean reference. On Wed, Jul 18, 2018 at 6:26 PM, Riccardo Ferrari wrote: > Alain, thank you for email. I really really appreciate it! > > I am actually trying to remove the disk io from the suspect list, thus I'm > want to reduce the number of concurrent compactors. I'll g

Re: concurrent_compactors via JMX

2018-07-18 Thread Riccardo Ferrari
Alain, thank you for email. I really really appreciate it! I am actually trying to remove the disk io from the suspect list, thus I'm want to reduce the number of concurrent compactors. I'll give thorughput a shot. No, I don't have a long list of pending compactions, however my instances are still

Re: concurrent_compactors via JMX

2018-07-18 Thread Chris Lohfink
Refer to Alains email but to strictly answer the question of increasing concurrent_compactors via jmx: There are two attributes you can increase that would set the maximum number of concurrent compactions. org.apache.cassandra.db:type=CompactionManager,name=MaximumCompactorThreads -> 6 org.ap

Re: concurrent_compactors via JMX

2018-07-17 Thread Alain RODRIGUEZ
Hello Riccardo, I noticed I have been writing a novel to answer a simple couple of questions again ¯\_(ツ)_/¯. So here is a short answer in the case that's what you were looking for :). Also, there is a warning that it might be counter-productive and stress the cluster even more to increase the com