You need to also have the mx4j jar in your Cassandra lib directory. Double checking you did that – its not included with the distro. You have to download it.
http://mx4j.sourceforge.net/ R From: Nitan Kainth <ni...@sleepiqlabs.com> Reply-To: "user@cassandra.apache.org" <user@cassandra.apache.org> Date: Wednesday, July 26, 2017 at 8:22 AM To: "User cassandra.apache.org" <user@cassandra.apache.org> Subject: Re: read/write request counts and write size of each write Thank you very much Kurt. I am not a java guy, need one small help. I initiated JMX connection but I am getting some exception: java -jar ~/jmxterm-1.0-alpha-4-uber.jar --url localhost:7199 Welcome to JMX terminal. Type "help" for available commands. $>run -b org.apache.cassandra.metrics:type=ClientRequest scope=CASWrite name=MutationSizeHistogram #InstanceNotFoundException: org.apache.cassandra.metrics:type=ClientRequest I verified, Cassandra is running on my machine. On Tue, Jul 25, 2017 at 9:36 PM, kurt greaves <k...@instaclustr.com<mailto:k...@instaclustr.com>> wrote: Looks like you can collect MutationSizeHistogram for each write as well from the coordinator, in regards to write request size. See the Write request section under https://cassandra.apache.org/doc/latest/operating/metrics.html#client-request-metrics<https://urldefense.proofpoint.com/v2/url?u=https-3A__cassandra.apache.org_doc_latest_operating_metrics.html-23client-2Drequest-2Dmetrics&d=DwMFaQ&c=gFTBenQ7Vj71sUi1A4CkFnmPzqwDo07QsHw-JRepxyw&r=_V9IzBxaV864n6VoHCzfArKKHY9Xqk-DWw-wAB9JU7E&m=_TOyM3vR40V4Xvh1nWnClVq3MYuybHfhdtWfkIGvVlk&s=vgnwngzAkTiksz5qoRNA71R9UZTCiYLkjw4qXe5nK74&e=>
