jamesgolick / cassandra-munin-plugins

Munin plugins for apache cassandra.

Cassandra Munin Plugins

These plugins are configurations for something called jmxquery that I found somewhere. Unfortunately, though, I forget where.

Installation

Make sure all the files from this repo are in the same directory and that jmx_ is executable. Then in /etc/munin/plugins, create a symlink named after each of the plugin configurations to the jmx_ executable. The symlink needs to be an absolute path, not relative, or jmx_ won't be able to parse it correctly.

Copy and modify the standard1* metrics for the columnfamlies you wish to monitor. (These should include system.HintsColumnFamily, in production.)

If you take a look at the .conf files, it should be fairly straightforward to figure out how to create your own.

If you have JMX running on a non-standard port (something other than 8080), you can set it in your munin config like this:

[cassandra_] env.jmxurl service:jmx:rmi:///jndi/rmi://localhost:YOURPORTHERE/jmxrmi

Credits

Configs by James Golick and Jonathan Ellis. I wish I knew who wrote jmxquery so I could credit them here.

cassandra-munin-plugins's Issues

jmxquery source

I believe this is the source of jmxquery:

http://code.google.com/p/jmxquery/

Failed creating compaction bytes graph

I'm not sure if this is a bug on my end, but I just noticed this while trying to setup cassandra-munin plugin for the first time.

2010/08/20 15:40:23 [INFO] creating rrd-file for compactions_bytes->bytes: '/var/lib/munin/squidoo.com/db3.squidoo.com-compactions_bytes-bytes-d.rrd'
2010/08/20 15:40:23 [ERROR] In RRD: Error updating /var/lib/munin/squidoo.com/db3.squidoo.com-compactions_bytes-bytes-d.rrd: not a simple integer: 'null'

Also, I am planning to write a tool to help with creating and linking conf files for each CF. Will share if/when I manage to get it working.