Set system properties during startup

Use the system property (-D) switch to modify the Hyper-Converged Database (HCD) settings during start up. To automatically pass the settings each time HCD starts, uncomment or add the switch to the jvm-server.options file.

Hyper-Converged Database (HCD) is built to run on Java 11.

The default JVM garbage collector for HCD is G1 GC. Configure GC options in the jvm11-server.options file.

Synopsis

Change the start up parameters using the following syntax:

Command line:

hcd cassandra -D<parameter_name>=<value>

jvm-server.options file:
```
-D<parameter_name>=<value>
```

cassandra-env.sh file:

JVM_OPTS="$JVM_OPTS -D<parameter_name>=<value>"

Only pass the parameter to the start-up operation once. If the same switch is passed to the start operation multiple times, for example from both the jvm-server.options file and on the command line, HCD might fail to start or may use the wrong parameter.

Startup examples

Starting a node without joining the ring:

Command line:

hcd cassandra -Dcassandra.join_ring=false

jvm-server.options file:
```
-Dcassandra.join_ring=false
```

Replacing a dead node:

Command line:

hcd cassandra -Dcassandra.replace_address=10.91.176.160

jvm-server.options file:

-Dcassandra.replace_address=10.91.176.160

Apache Cassandra® system properties: Change HCD database native Cassandra system properties at startup.
Java Management Extension system properties: Change Java Management Extension system properties of the HCD database.

Set system properties during startup

Synopsis

Startup examples

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