Nitan, I'm not really familiar with jmxterm but the error it's returning to you is because that MBean doesn't exist. The full MBean matching your example is org.apache.cassandra.metrics:type=ClientRequest,scope=CASWrite,name=MutationSizeHistogram. You can then call the operation values on it to get the current snapshot of metrics.
run -b org.apache.cassandra.metrics:type=ClientRequest,scope=CASWrite,name=MutationSizeHistogram values Alternatively you can use 'get' to get an attribute instead of perform an operation: get -b org.apache.cassandra.metrics:type=ClientRequest,scope=CASWrite,name=MutationSizeHistogram Count And instead of Count you can use 50thPercentile/75thPercentile etc as mentioned in http://cassandra.apache.org/doc/latest/operating/metrics.html (It's a Timer). As Kurt mentioned, there are existing solutions to the JMX calls for you (Graphana, Datadog....). Hope that helps. On 27 July 2017 at 07:07, Roger Warner <rwar...@pandora.com> wrote: > I think that is not the correct lib directory. You want it under > $CASSANDRA_HOME/lib. Ie wherever you deployed cassandra distro into / lib > > > > That directory should be loaded with *.jar files. That is the directory > you want. > > > > Roger > > > > *From: *Nitan Kainth <ni...@bamlabs.com> > *Reply-To: *"user@cassandra.apache.org" <user@cassandra.apache.org> > *Date: *Wednesday, July 26, 2017 at 1:42 PM > *To: *"user@cassandra.apache.org" <user@cassandra.apache.org> > > *Subject: *Re: read/write request counts and write size of each write > > > > Hey Roger, > > > > I downloaded and saved the file in /var/lib/cassandra, but getting same > error: > > > > java -jar /tmp/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 tried using mx4 jar file: > > > > java -jar /var/lib/cassandra/mx4j-3.0.1.jar url localhost:7199 > > no main manifest attribute, in /var/lib/cassandra/mx4j-3.0.1.jar > > > > > > > > On Jul 26, 2017, at 11:50 AM, Roger Warner <rwar...@pandora.com> wrote: > > > > 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/ > <https://urldefense.proofpoint.com/v2/url?u=http-3A__mx4j.sourceforge.net_&d=DwMFaQ&c=gFTBenQ7Vj71sUi1A4CkFnmPzqwDo07QsHw-JRepxyw&r=_V9IzBxaV864n6VoHCzfArKKHY9Xqk-DWw-wAB9JU7E&m=rd2FJwCKPP5z8NHhUlnT38ZikdsXjyW01dIzgTpVNZI&s=ALRm4TAh0JSWovaZA0ijrCAmzPz_H1hBZEJ_psmMGyU&e=> > > > > 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 > <https://urldefense.proofpoint.com/v2/url?u=http-3A__cassandra.apache.org&d=DwMFaQ&c=gFTBenQ7Vj71sUi1A4CkFnmPzqwDo07QsHw-JRepxyw&r=_V9IzBxaV864n6VoHCzfArKKHY9Xqk-DWw-wAB9JU7E&m=rd2FJwCKPP5z8NHhUlnT38ZikdsXjyW01dIzgTpVNZI&s=K_gfKLpT6YRBplNhlYsM7Rgtx7FEz-Q6bvXUom6GMks&e=>" > <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> > 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 underhttps://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=> > > > > > > > > >
