Cassandra

This integration collects JMX metrics from Cassandra. The plugin uses the Jolokia read service. A bridge plugin included with the SolarWinds Snap Agent provides the Cassandra integration. The bridge plugin uses the Telegraf Jolokia2 plugin.

This integration is currently only available for Windows and Linux.

Prerequisites

Please follow official Jolokia agent documentation on steps required to download and use the service for your application.

To verify if metrics can be gathered, run following command:

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curl http://localhost:8778/jolokia/read/org.apache.cassandra.metrics:name=*,scope=*,type=Cache

The following response should be returned:

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# response
{
  "request": {
    "mbean": "org.apache.cassandra.metrics:name=*,scope=*,type=Cache",
    "type": "read"
  },
  "value": {
    "org.apache.cassandra.metrics:name=Hits,scope=KeyCache,type=Cache": {
      "RateUnit": "events/second",
      "OneMinuteRate": 1.9906081502830593e-21,
      "Count": 42,
      "FifteenMinuteRate": 0.2902696206403156,
      "FiveMinuteRate": 0.0003821473143686264,
      "MeanRate": 0.014042358437411123
    },
    "org.apache.cassandra.metrics:name=Entries,scope=CounterCache,type=Cache": {
      "Value": 0
    },
    "org.apache.cassandra.metrics:name=OneMinuteHitRate,scope=CounterCache,type=Cache": {
      "Value": null
    },
…

Configuration

The agent provides an example task file to help you get started quickly, but you must provide the correct settings for your Cassandra installation. To enable and configure the task:

Make a copy of the cassandra example task file task-bridge-cassandra.yaml.example, renaming it to task-bridge-cassandra.yaml:

On Windows, using Explorer or PowerShell:

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copy "C:\ProgramData\SolarWinds\Snap\tasks-autoload.d\task-bridge-cassandra.yaml.example" "C:\ProgramData\SolarWinds\Snap\tasks-autoload.d\task-bridge-cassandra.yaml"

On Linux using command line:

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sudo cp -p /opt/SolarWinds/Snap/etc/tasks-autoload.d/task-bridge-cassandra.yaml.example /opt/SolarWinds/Snap/etc/tasks-autoload.d/task-bridge-cassandra.yaml

Edit the task file with settings specific to your Jolokia install:

If you wish to also collect logs for this service, uncomment the last section in the example task file. For more information on collecting logs, see the logs collector docs.

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---
version: 2

schedule:
  type: cron
  interval: "0 * * * * *"

plugins:
  - plugin_name: bridge
    config:
      jolokia2:

        ## Metric name prefix
        bridge_prefix: cassandra

        ## List of urls exposing jolokia read service
        urls:
          - http://localhost:8778/jolokia

        ## List of metrics to be collected from jolokia read service
        metrics:
          ## based on https://github.com/influxdata/telegraf/blob/master/plugins/inputs/jolokia2/examples/cassandra.conf
          - name: Cache
            mbean: org.apache.cassandra.metrics:name=*,scope=*,type=Cache
            tag_keys:
              - name
              - scope
            field_prefix: $1_

          - name: Client
            mbean: org.apache.cassandra.metrics:name=*,type=Client
            tag_keys:
              - name
            field_prefix: $1_

          - name: ClientRequestMetrics
            mbean: org.apache.cassandra.metrics:name=*,type=ClientRequestMetrics
            tag_keys:
              - name
            field_prefix: $1_

          - name: ClientRequest
            mbean: org.apache.cassandra.metrics:name=*,scope=*,type=ClientRequest
            tag_keys:
              - name
              - scope
            field_prefix: $1_

          - name: ColumnFamily
            mbean: org.apache.cassandra.metrics:keyspace=*,name=*,scope=*,type=ColumnFamily
            tag_keys:
              - keyspace
              - name
              - scope
            field_prefix: $2_

          - name: CommitLog
            mbean: org.apache.cassandra.metrics:name=*,type=CommitLog
            tag_keys:
              - name
            field_prefix: $1_

          - name: Compaction
            mbean: org.apache.cassandra.metrics:name=*,type=Compaction
            tag_keys:
              - name
            field_prefix: $1_

          - name: CQL
            mbean: org.apache.cassandra.metrics:name=*,type=CQL
            tag_keys:
              - name
            field_prefix: $1_

          - name: DroppedMessage
            mbean: org.apache.cassandra.metrics:name=*,scope=*,type=DroppedMessage
            tag_keys:
              - name
              - scope
            field_prefix: $1_

          - name: FileCache
            mbean: org.apache.cassandra.metrics:name=*,type=FileCache
            tag_keys:
              - name
            field_prefix: $1_

          - name: ReadRepair
            mbean: org.apache.cassandra.metrics:name=*,type=ReadRepair
            tag_keys:
              - name
            field_prefix: $1_

          - name: Storage
            mbean: org.apache.cassandra.metrics:name=*,type=Storage
            tag_keys:
              - name
            field_prefix: $1_

          - name: ThreadPools
            mbean: org.apache.cassandra.metrics:name=*,path=*,scope=*,type=ThreadPools
            tag_keys:
              - name
              - path
              - scope
            field_prefix: $1_

    tags:
      /:
        collector_plugin: "cassandra"

    publish:
      - plugin_name: publisher-appoptics

## If you want to gather logs for this integration, uncomment the following section.
#  - plugin_name: log-files
#    config:
#      file_paths:
#        - /var/log/cassandra/*

#    publish:
#      - plugin_name: loggly-http-bulk

Restart the agent:

On Windows command line:
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```
net stop swisnapd
net start swisnapd
```
On Linux command line:
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```
sudo service swisnapd restart
```
Enable the Jolokia2 integration in AppOptics:

On the Integrations Page you will see Jolokia2 integration available. It may take a couple minutes before the Jolokia2 integration is identified. Select the Jolokia2 integration to open the configuration menu in AppOptics, and enable it. If you do not see Jolokia2 as an option, see Troubleshooting Linux.

Metrics and Tags

The Cassandra integration collect JMX Cassandra metrics. For a full list of available metrics and their descriptions, please visit Cassandra documentation.

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