Each nodetool subcommand is defined here. https://github.com/apache/cassandra/tree/trunk/src/java/org/apache/cassandra/tools/nodetool
Each command will call back into the NodeProbe object (sometimes indirectly), which makes the actual JMX calls: https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/tools/NodeProbe.java Often times one nodetool command may call multiple JMX methods or read multiple JMX properties. My general approach is to start from the command ad follow all the method calls until I find the name of an MBean (using an IDE can be helpful for this). In the case of status, it is getting the DC info from org.apache.cassandra.db:type=EndpointSnitchInfo, which is accessed from NodeProbe.getEndpointSnitchInfoProxy(). In the case of gossipinfo, it's from org.apache.cassandra.net: type=FailureDetector. On Mon, Mar 30, 2020 at 1:55 PM Jai Bheemsen Rao Dhanwada < jaibheem...@gmail.com> wrote: > Hello All, > > I am trying to find the mBean that gives information for "node tool > gossipinfo" or "nodetool status". > Back ground: I am trying find the available Datacenters in my Cassandra > cluster using the JMX mBeans. > > Thanks in advance. >
