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=<New CoreCompactorThreads value>. Best, Romain Le Mardi 20 septembre 2016 13h50, Thomas Julian <thomasjul...@zoho.com> 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.