Re: How to alter the default value for concurrent_compactors

2016-09-20 Thread Romain Hardouin 
Hi,
You can read and write the value of the following MBean via 
JMX:org.apache.cassandra.db:type=CompactionManager  - CoreCompactorThreads
 - MaximumCompactorThreads

If you modify CoreCompactorThreads it will be effective immediatly, I mean 
assuming you have some pending compactions, you will see N lines with nodetool 
compactionstats where N=.
Best,
Romain
 

Le Mardi 20 septembre 2016 13h50, Thomas Julian  a 
écrit :
 

 Hello,

We have commented out "concurrent_compactors" in our Cassandra 2.1.13 
installation. 
We would like to review this setting, as some issues indicate that the default 
configuration may affect read/write performance. 

https://issues.apache.org/jira/browse/CASSANDRA-8787
https://issues.apache.org/jira/browse/CASSANDRA-7139

Where can we see the value set for concurrent_compactors in our setup? Is it 
possible to update this configuration without a restart?

Best Regards,
Julian.

How to alter the default value for concurrent_compactors

2016-09-20 Thread Thomas Julian 
Hello,



We have commented out "concurrent_compactors" in our Cassandra 2.1.13 
installation. 

We would like to review this setting, as some issues indicate that the default 
configuration may affect read/write performance. 



https://issues.apache.org/jira/browse/CASSANDRA-8787

https://issues.apache.org/jira/browse/CASSANDRA-7139



Where can we see the value set for concurrent_compactors in our setup? Is it 
possible to update this configuration without a restart?



Best Regards,

Julian.