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Restart=always leads to the following loop: 1. scylla terminates abnormally 2. scylla-jmx sees that, and terminates 3. systemd sees that scylla-jmx terminated, and restarts it. 4. scylla-jmx requires scylla, so systemd starts it. 5. goto 1. To prevent the loop, set Restart=on-abnormal; systemd will restart scylla-jmx if some JVM bug got it killed, but not otherwise. The downside to this patch is that if scylla-server goes down, so does scylla-jmx, but if scylla-server is then restarted, scylla-jmx stays down. To get scylla and scylla-jmx to start together, we need to create scylla.service that requires both of them.
Urchin JMX Interface
This is the JMX interface for Scylla
Compile
To compile do:
mvn install
Run
The maven will create an uber-jar with all dependency under the target directory. You should run it with the remote jmx enable so the nodetool will be able to connect to it.
java -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=7199 -Dcom.sun.management.jmxremote.local.only=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -jar target/scylla-jmx-1.0.jar
Setting IP and Port
By default the the JMX would connect to a node on the localhost on port 10000.
The jmx API uses the system properties to set the IP address and Port. To change the ip address use the apiaddress property (e.g. -Dapiaddress=1.1.1.1) To change the port use the apiport (e.g. -Dapiport=10001)