be8f1ac511
Currently scylla-jmx.service's PWD is "/", we get following error when JVM trying to write heap dump on current directory: Aug 17 05:52:15 localhost.localdomain scylla-jmx[3469]: Starting the JMX server Aug 17 05:52:16 localhost.localdomain scylla-jmx[3469]: java.lang.OutOfMemoryError: Java heap space Aug 17 05:52:16 localhost.localdomain scylla-jmx[3469]: Dumping heap to java_pid3469.hprof ... Aug 17 05:52:16 localhost.localdomain scylla-jmx[3469]: Unable to create java_pid3469.hprof: Permission denied To fix this, we need to specify WorkingDirectory on systemd unit.
Scylla JMX Server
Scylla JMX server implements the Apache Cassandra JMX interface for compatibility with tooling such as nodetool. The JMX server uses Scylla's REST API to communicate with a Scylla server.
Compiling
To compile JMX server, run:
$ mvn --file scylla-jmx-parent/pom.xml package
Running
To start the JMX server, run:
$ ./scripts/scylla-jmx
To get help on supported options:
$ ./scripts/scylla-jmx --help