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The "MemtableThresholds" page has been changed by defmikekoh: http://wiki.apache.org/cassandra/MemtableThresholds?action=diff&rev1=21&rev2=22 == Using Jconsole To Optimize Thresholds == Cassandra's column-family mbeans have a number of attributes that can prove invaluable in determining optimal thresholds. One way to access this instrumentation is by using Jconsole, a graphical monitoring and management application that ships with your JDK. - Launching Jconsole with no arguments will display the "New Connection" dialog box. If you are running Jconsole on the same machine that Cassandra is running on, then you can connect using the PID, otherwise you will need to connect remotely. The default startup scripts for Cassandra cause the VM to listen on port 8080 using the JVM option: + Launching Jconsole with no arguments will display the "New Connection" dialog box. If you are running Jconsole on the same machine that Cassandra is running on, then you can connect using the PID, otherwise you will need to connect remotely. The default startup scripts for Cassandra cause the VM to listen on port 8080 (7199 starting in v0.8.0-beta1) using the JVM option: . -Dcom.sun.management.jmxremote.port=8080