23. GeoMesa Metrics¶

GeoMesa provides integration with the DropWizard Metrics library for real-time reporting with the geomesa-metrics module.

23.1. Instrumentation of GeoServer¶

GeoMesa metrics provides a servlet filter that will instrument GeoServer requests.

23.2. Installation¶

Copy the following jars into geoserver’s WEB-INF/lib directory:

geomesa-metrics-.jar
metrics-core-3.1.2.jar
metrics-graphite-3.1.2.jar
metrics-ganglia-3.1.2.jar

Also copy the following jars if not already present:

scala-library-2.11.7.jar
scala-logging_2.11-3.1.0.jar
scala-reflect-2.11.7.jar
config-1.2.1.jar
joda-time-2.3.jar

23.2.1. Ganglia Reporting¶

To enable ganglia reporters, also copy the following jars:

gmetric4j-1.0.7.jar
oncrpc-1.0.7.jar

23.2.2. Delimited File Reporting¶

To enable TSV/CSV reporters, also copy the following jars:

commons-csv-1.0.jar

23.3. Configuration¶

To configure instrumentation, add the metrics filter to GeoServer’s WEB-INF/web.xml:

<filter>
  <filter-name>metricsFilter</filter-name>
  <filter-class>org.locationtech.geomesa.metrics.servlet.AggregatedMetricsFilter</filter-class>
  <!-- name used for registering metrics - can also be specified in the config, but this takes priority -->
  <init-param>
    <param-name>name-prefix</param-name>
    <param-value>geoserver</param-value>
  </init-param>
  <!-- can embed configuration directly, otherwise will load default
       configurations and look under 'geomesa.metrics.servlet' -->
  <init-param>
    <param-name>config</param-name>
    <param-value>
    {
      // name used for registering metrics - init-param takes precedence
      name-prefix = "geoserver"
      // will only instrument matching urls
      // example string matched against: '/geoserver/&lt;workspace&gt;/ows'
      url-patterns = [ "(?i).*/(ows|wfs|wms)" ]
      // match request mappings based on just the workspace:layer name, or the whole url
      // if you are instrumenting non-wfs/wms requests, layer names will never match
      map-by-layer = true
      // mappings of urls to metric groups, based on regexes
      // any urls not mapped will end up under 'other'
      request-mappings = [
        {
          name = "qs"
          regex = ".*:AccumuloQuickStart"
        }
      ]
      // metrics reporters - see configuration details below
      reporters = {
        console = {
          type = "console"
          rate-units = "MINUTES"
          duration-units = "MILLISECONDS"
          interval = 10
        }
      }
    }
    </param-value>
  </init-param>
</filter>

<filter-mapping>
  <filter-name>metricsFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

23.4. Session Tracking¶

The metrics servlet doesn’t track active user sessions by default. GeoServer mostly doesn’t create sessions for OWS requests, and blatantly warns you against doing so. However, if you are willing to incur the cost of session management, you may enable session tracking in the metrics servlet.

Update the configuration for the metrics servlet (either in application.conf or web.xml) with the following attribute:

// how often to update metrics for expired sessions, in seconds
// if set to &lt; 1, sessions will not be tracked
// use in conjunction with the session listener defined below
session-removal-interval = 60

Add the following listener to GeoServer’s WEB-INF/web.xml:

Warning

Failure to add this listener when session tracking is enabled will cause incorrect metrics reports and eventually lead to out-of-memory errors

<!-- listener for sessions events
     if you enable session tracking and this is not defined, sessions will never
     be expired from the metrics cache and you will eventually run out of memory -->
<listener>
  <listener-class>org.locationtech.geomesa.metrics.servlet.SessionMetricsListener</listener-class>
</listener>

In order to suppress GeoServer’s warnings about session creation, comment out the following filter in GeoServer’s WEB-INF/web.xml:

<!--
<filter>
  <filter-name>SessionDebugger</filter-name>
  <filter-class>org.geoserver.filters.SessionDebugFilter</filter-class>
</filter>
-->
...
<!--
<filter-mapping>
  <filter-name>SessionDebugger</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>
-->

23.5. Configuration of Reporters¶

Use org.locationtech.geomesa.metrics.config.MetricsConfig.reporters to configure reporters via TypeSafe Config. Reporters should be defined as objects under the path geomesa.metrics.reporters:

geomesa = {
  metrics = {
    reporters = {
      console = {
        type     = "console"
        units    = "MILLISECONDS"
        interval = 60
      }
      slf4j = {
        type     = "slf4j"
        units    = "MILLISECONDS"
        interval = 60
        logger   = "org.locationtech.geomesa"
        level    = "debug"
      }
      delimited-text = {
        type      = "delimited-text"
        units     = "MILLISECONDS"
        interval  = 60
        tabs      = true
        aggregate = true
        output    = ${java.io.tmpdir}/"geoserver-metrics"
      }
      graphite = {
        type     = "graphite"
        units    = "MILLISECONDS"
        interval = 60
        url      = "graphite.example.com:80"
        prefix   = "org.locationtech.geomesa"
      }
      ganglia = {
        type            = "ganglia"
        units           = "MILLISECONDS"
        interval        = 60
        group           = "ganglia.example.com"
        port            = 8649
        addressing-mode = "MULTICAST"
        ttl             = 1
        ganglia311      = true
      }
      accumulo = {
        type       = "accumulo"
        units      = "MILLISECONDS"
        interval   = -1
        instanceId = "mycloud"
        zookeepers = "zoo1,zoo2,zoo3"
        user       = "myuser"
        password   = "mypassword"
        tableName  = "geomesa_metrics"
      }
    }
  }
}

23.6. Standard Configuration¶

The following fields are common among all reporters:

Field	Type	Description
`rate-units`	String	The type of units used to report the rate of a metric. Corresponds to `java.util.concurrent.TimeUnit`
`duration-units`	String	The type of units used to report the duration of a metric. Corresponds to `java.util.concurrent.TimeUnit`
`units`	String	If rate or duration units are not specified, this will be used instead.
`interval`	Integer	How often the reporter will run, in seconds. If less than 1, reporter will not run automatically.
`type`	String	The type of reporter. Types are documented below.

23.6.1. Console Reporter¶

Writes metrics to the console.

Field	Type	Description
`type`	String	Must be `console`

23.6.2. Slf4j Reporter¶

Writes metrics using an slf4j logger.

Field	Type	Description
`type`	String	Must be `slf4j`
`logger`	String	The name of the logger that will be used for logging.
`level`	String	(optional) Level to use for logger messages. One of `trace`, `debug`, `info`, `warn`, `error`. Default is `debug`

23.6.3. Delimited Text Reporter¶

Writes metrics to tab or comma-delimited files.

Field	Type	Description
`type`	String	Must be `delimited-text`
`output`	String	The path to output metrics to. Will be passed into `new java.io.File(output)`
`aggregate`	Boolean	(optional) Aggregate output files by type. If true, there will be one file per metric type; if false there will be one file per metric. Default is `true`
`tabs`	Boolean	(optional) If true, delimit entries with tabs, else delimit entries with commas. Default is `true`

23.6.4. Graphite Reporter¶

Writes metrics to Graphite.

Field	Type	Description
`type`	String	Must be `graphite`
`url`	String	The URL to the graphite server, in the form of `<host>:<port>`
`prefix`	String	(optional) The graphite prefix to use

23.6.5. Ganglia Reporter¶

Writes metrics to Ganglia.

Field	Type	Description
`type`	String	Must be `ganglia`
`group`	String	The group (url) used for connecting to the ganglia server
`port`	Int	The port used for connecting to the ganglia server
`ttl`	Int	Time-to-live for broadcast packets, in the range of 0-255
`addressing-mode`	String	(optional) Addressing mode to use. Must be one of `unicast` or `multicast`
`ganglia311`	Boolean	(optional) To use protocol version 3.1 (true) or 3.0 (false). Default is 3.1

23.6.6. Accumulo Reporter¶

Writes metrics to Accumulo.

Field	Type	Description
`type`	String	Must be `accumulo`
`instanceId`	String	The instance ID for the accumulo cluster
`zookeepers`	String	The zookeeper connection string for the accumulo cluster
`user`	String	The accumulo user to connect with
`password`	String	The password for the accumulo user
`tableName`	String	The table metrics will be written to
`visibilities`	String	(optional) Visibilities applied to written data