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Chapter 112. Ganglia Component
Available as of Camel version 2.15
Provides a mechanism to send a value (the message body) as a metric to the Ganglia monitoring system. Uses the gmetric4j library. Can be used in conjunction with standard Ganglia and JMXetric for monitoring metrics from the OS, JVM and business processes through a single platform.
You should have a Ganglia gmond agent running on the machine where your JVM runs. The gmond sends a heartbeat to the Ganglia infrastructure, camel-ganglia can’t send the heartbeat itself currently.
On most Linux systems (Debian, Ubuntu, Fedora and RHEL/CentOS with EPEL) you can just install the Ganglia agent package and it runs automatically using multicast configuration. You can configure it to use regular UDP unicast if you prefer.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-ganglia</artifactId>
<version>x.x.x</version>
<!-- use the same version as your Camel core version -->
</dependency>112.1. URI format
ganglia:address:port[?options]
You can append query options to the URI in the following format, ?option=value&option=value&…
112.2. Ganglia component and endpoint URI options
The Ganglia component supports 2 options which are listed below.
| Name | Description | Default | Type |
|---|---|---|---|
| configuration (advanced) | To use the shared configuration | GangliaConfiguration | |
| resolveProperty Placeholders (advanced) | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | boolean |
The Ganglia endpoint is configured using URI syntax:
ganglia:host:port
with the following path and query parameters:
112.2.1. Path Parameters (2 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| host | Host name for Ganglia server | 239.2.11.71 | String |
| port | Port for Ganglia server | 8649 | int |
112.2.2. Query Parameters (13 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| dmax (producer) | Minumum time in seconds before Ganglia will purge the metric value if it expires. Set to 0 and the value will remain in Ganglia indefinitely until a gmond agent restart. | 0 | int |
| groupName (producer) | The group that the metric belongs to. | java | String |
| metricName (producer) | The name to use for the metric. | metric | String |
| mode (producer) | Send the UDP metric packets using MULTICAST or UNICAST | MULTICAST | UDPAddressingMode |
| prefix (producer) | Prefix the metric name with this string and an underscore. | String | |
| slope (producer) | The slope | BOTH | GMetricSlope |
| spoofHostname (producer) | Spoofing information IP:hostname | String | |
| tmax (producer) | Maximum time in seconds that the value can be considered current. After this, Ganglia considers the value to have expired. | 60 | int |
| ttl (producer) | If using multicast, set the TTL of the packets | 5 | int |
| type (producer) | The type of value | STRING | GMetricType |
| units (producer) | Any unit of measurement that qualifies the metric, e.g. widgets, litres, bytes. Do not include a prefix such as k (kilo) or m (milli), other tools may scale the units later. The value should be unscaled. | String | |
| wireFormat31x (producer) | Use the wire format of Ganglia 3.1.0 and later versions. Set this to false to use Ganglia 3.0.x or earlier. | true | boolean |
| synchronous (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean |
112.3. Message body
Any value (such as a string or numeric type) in the body is sent to the Ganglia system.
112.4. Return value / response
Ganglia sends metrics using unidirectional UDP or multicast. There is no response or change to the message body.
112.5. Examples
112.5.1. Sending a String metric
The message body will be converted to a String and sent as a metric value. Unlike numeric metrics, String values can’t be charted but Ganglia makes them available for reporting. The os_version string at the top of every Ganglia host page is an example of a String metric.
from("direct:string.for.ganglia")
.setHeader(GangliaConstants.METRIC_NAME, simple("my_string_metric"))
.setHeader(GangliaConstants.METRIC_TYPE, GMetricType.STRING)
.to("direct:ganglia.tx");
from("direct:ganglia.tx")
.to("ganglia:239.2.11.71:8649?mode=MULTICAST&prefix=test");112.5.2. Sending a numeric metric
from("direct:value.for.ganglia")
.setHeader(GangliaConstants.METRIC_NAME, simple("widgets_in_stock"))
.setHeader(GangliaConstants.METRIC_TYPE, GMetricType.UINT32)
.setHeader(GangliaConstants.METRIC_UNITS, simple("widgets"))
.to("direct:ganglia.tx");
from("direct:ganglia.tx")
.to("ganglia:239.2.11.71:8649?mode=MULTICAST&prefix=test");