Apache Cassandra

Connectors directory^[1] Full listing of connectors^[2]

Description

Monitors performance, operational metrics, and cluster health for Cassandra databases through Java Management Extensions (JMX)

community^[3] database^[4] linux^[5] windows^[6]

Source^[7]

Target

Typical platform: Cassandra^[8]

Operating systems: Linux, Microsoft Windows

Prerequisites

Leverages: Apache Cassandra 3.0 or higher

Technology and protocols: JMX

Examples

CLI

metricshub HOSTNAME -t linux -c +Cassandra --jmx -u USER --jmx-port 7199

metricshub.yaml

resourceGroups:
  <RESOURCE_GROUP>:
    resources:
      <HOSTNAME-ID>:
        attributes:
          host.name: <HOSTNAME> # Change with actual host name
          host.type: linux
        connectors: [ +Cassandra ] # Optional, to load only this connector
        protocols:
          jmx:
            port: 7199
            username: <USERNAME> # Change with actual credentials
            password: <PASSWORD> # Encrypted using metricshub-encrypt

Connector Activation Criteria

The Apache Cassandra connector will be automatically activated, and its status will be reported as OK if all the below criteria are met:

The JMX request below succeeds when querying the monitored resource:
- Object Name: org.apache.cassandra.metrics:type=Storage,name=Load
- Attribute: Count
- Expected Result: ^[0-9] (regex)

Metrics

Type	Collected Metrics	Specific Attributes
cache	`db.server.cache.operations{db.cache.state="hit"}` `db.server.cache.operations{db.cache.state="miss"}` `db.server.cache.requests` `db.server.cache.size`	`db.cassandra.cache.type` `db.cluster.name` `db.server.name` `db.system` `db.version`
cassandra	`db.server.cache.usage{db.cache.state="off_heap", db.cassandra.cache.type="memtable"}` `db.server.cache.usage{db.cache.state="on_heap", db.cassandra.cache.type="memtable"}` `db.server.cassandra.hints` `db.server.current_connections` `db.server.errors{error.type="read_timeout"}` `db.server.errors{error.type="read_unavailable"}` `db.server.errors{error.type="write_timeout"}` `db.server.errors{error.type="write_unavailable"}` `db.server.operations{db.io.direction="read"}` `db.server.operations{db.io.direction="write"}` `db.server.pending_operations{db.operation.type="compaction"}` `db.server.storage.io{db.io.direction="write"}` `db.server.storage.size` `db.server.uptime`	`db.cluster.name` `db.server.name` `db.system` `db.version`
cassandra_cluster	`db.server.cassandra.nodes{db.node.state="joining"}` `db.server.cassandra.nodes{db.node.state="leaving"}` `db.server.cassandra.nodes{db.node.state="live"}` `db.server.cassandra.nodes{db.node.state="moving"}` `db.server.cassandra.nodes{db.node.state="unreachable"}`	`db.cluster.name` `db.server.name` `db.system` `db.version`
thread	`db.server.threads{db.thread.state="active"}` `db.server.threads{db.thread.state="blocked"}` `db.server.threads{db.thread.state="pending"}`	`db.cassandra.thread.role` `db.cluster.name` `db.server.name` `db.system` `db.thread.pool` `db.version`

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