Configure the Collectd Service Heap Size

The collectd service uses an embedded JVM when it gathers metrics from the CLDB, Node Manager, Resource Manager, and Drill. You can edit the Plugin Java section of collectd.conf to configure limits to the collectd virtual memory footprint.

Note: The Plugin Java section of the collectd.conf file may be commented or uncommented. The configure.sh utility will uncomment the Plugin Java section when collectd runs on a node that requires an embedded JVM. Therefore, when you update the file, do not add or remove comment symbols (#) in the Plugin java section

Complete the following steps on each collectd node:

Open the /opt/mapr/collectd/collectd-<version>/etc/collectd.conf file.

Look for the following section:

## **** MAPR_CONF_JMX_TAG: MAPR CONFIGURATION - DO NOT EDIT or REMOVE TAG/BLOCK ***
 <Plugin java> 
JVMArg "-Djava.class.path=......

Update Xms and Xmx options in the Plugin java section.
Xms defines the amount of memory allocated to the service when it starts. Xmx defines the maximum amount of memory allocated to the service.
If the <Plugin java> section is not commented out, the configuration may look like this:
```
## **** MAPR_CONF_JMX_TAG: MAPR CONFIGURATION - DO NOT EDIT or REMOVE TAG/BLOCK *** 
<Plugin java> 
JVMArg "-Djava.class.path=...... 
JVMArg "-Xms32m" 
JVMArg "-Xmx128m" 
```
If the <Plugin java> section is commented out, the configuration may look like this:
```
### **** MAPR_CONF_JMX_TAG: MAPR CONFIGURATION - DO NOT EDIT or REMOVE TAG/BLOCK *** 
#<Plugin java>
# JVMArg "-Djava.class.path=...... 
# JVMArg "-Xms32m" 
# JVMArg "-Xmx128m"
```

Restart the collectd service.

maprcli node services -name collectd -nodes <space separated list of hostname/IPaddresses> -action restart