Project: Netdata (Observability and Analysis / Observability)
File: cassandra.md

<!--startmeta customediturl: "https://github.com/netdata/netdata/edit/master/src/go/collectors/go.d.plugin/modules/cassandra/README.md" meta_yaml: "https://github.com/netdata/netdata/edit/master/src/go/collectors/go.d.plugin/modules/cassandra/metadata.yaml" sidebar_label: "Cassandra" learn_status: "Published" learnrelpath: "Collecting Metrics/Databases" most_popular: False message: "DO NOT EDIT THIS FILE DIRECTLY, IT IS GENERATED BY THE COLLECTOR'S metadata.yaml FILE" endmeta--> <img src="https://netdata.cloud/img/cassandra.svg" width="150"/> Plugin: go.d.plugin Module: cassandra <img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" /> This collector gathers metrics about client requests, cache hits, and many more, while also providing metrics per each thread pool. The is used to fetch metrics from a Cassandra instance and make them available at an endpoint like `http://127.0.0.1:7072/metrics`. This collector is supported on all platforms. This collector supports collecting metrics from multiple instances of this integration, including remote instances. This collector discovers instances running on the local host that provide metrics on port 7072. On startup, it tries to collect metrics from: http://127.0.0.1:7072/metrics The default configuration for this integration does not impose any limits on data collection. The default configuration for this integration is not expected to impose a significant performance impact on the system. Metrics grouped by scope. The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels. These metrics refer to the entire monitored application. This scope has no labels. Metrics: | Metric | Dimensions | Unit | |:|:-|:-| | cassandra.clientrequestsrate | read, write | requests/s | | cassandra.clientrequestreadlatencyhistogram | p50, p75, p95, p98, p99, p999 | seconds | | cassandra.clientrequestwritelatencyhistogram | p50, p75, p95, p98, p99, p999 | seconds | | cassandra.clientrequestslatency | read, write | seconds | | cassandra.rowcachehitratio | hitratio | percentage | | cassandra.rowcachehit_rate | hits, misses | events/s | | cassandra.rowcacheutilization | used | percentage | | cassandra.rowcachesize | size | bytes | | cassandra.keycachehitratio | hitratio | percentage | | cassandra.keycachehit_rate | hits, misses | events/s | | cassandra.keycacheutilization | used | percentage | | cassandra.keycachesize | size | bytes | | cassandra.storagelivediskspaceused | used | bytes | | cassandra.compactioncompletedtasks_rate | completed | tasks/s | | cassandra.compactionpendingtasks_count | pending | tasks | | cassandra.compactioncompactedrate | compacted | bytes/s | | cassandra.jvmmemoryused | heap, nonheap | bytes | | cassandra.jvmgcrate | parnew, cms | gc/s | | cassandra.jvmgctime | parnew, cms | seconds | | cassandra.droppedmessagesrate | dropped | messages/s | | cassandra.clientrequeststimeouts_rate | read, write | timeout/s | | cassandra.clientrequestsunavailables_rate | read, write | exceptions/s | | cassandra.clientrequestsfailures_rate | read, write | failures/s | | cassandra.storageexceptionsrate | storage | exceptions/s | Metrics related to Cassandra's thread pools. Each thread pool provides its own set of the following metrics. Labels: | Label | Description | |:--|:-| | thread_pool | thread pool name | Metrics: | Metric | Dimensions | Unit | |:|:-|:-| | cassandra.threadpoolactivetaskscount | active | tasks | | cassandra.threadpoolpendingtaskscount | pending | tasks | | cassandra.threadpoolblockedtaskscount | blocked | tasks | |

| blocked | tasks/s | There are no alerts configured by default for this integration. To configure Cassandra with the : Note: paths can differ depends on your setup. Download latest jar file and install it in a directory where Cassandra can access it. Add the file to `/etc/cassandra`. Add the following line to `/etc/cassandra/cassandra-env.sh` ``` JVMOPTS="$JVMOPTS $JVMEXTRAOPTS -javaagent:/opt/jmxexporter/jmxexporter.jar=7072:/etc/cassandra/jmx_exporter.yaml ``` Restart cassandra service. The configuration file name for this integration is `go.d/cassandra.conf`. You can edit the configuration file using the `edit-config` script from the Netdata . ```bash cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata sudo ./edit-config go.d/cassandra.conf ``` The following options can be defined globally: updateevery, autodetectionretry. <details><summary>Config options</summary> | Name | Description | Default | Required | |:-|:--|:-|:--:| | update_every | Data collection frequency. | 5 | no | | autodetection_retry | Recheck interval in seconds. Zero means no recheck will be scheduled. | 0 | no | | url | Server URL. | http://127.0.0.1:7072/metrics | yes | | username | Username for basic HTTP authentication. | | no | | password | Password for basic HTTP authentication. | | no | | proxy_url | Proxy URL. | | no | | proxy_username | Username for proxy basic HTTP authentication. | | no | | proxy_password | Password for proxy basic HTTP authentication. | | no | | timeout | HTTP request timeout. | 2 | no | | notfollowredirects | Redirect handling policy. Controls whether the client follows redirects. | no | no | | tlsskipverify | Server certificate chain and hostname validation policy. Controls whether the client performs this check. | no | no | | tls_ca | Certification authority that the client uses when verifying the server's certificates. | | no | | tls_cert | Client TLS certificate. | | no | | tls_key | Client TLS key. | | no | </details> A basic example configuration. ```yaml jobs: name: local url: http://127.0.0.1:7072/metrics ``` Local server with basic HTTP authentication. <details><summary>Config</summary> ```yaml jobs: name: local url: http://127.0.0.1:7072/metrics username: foo password: bar ``` </details> Local server with enabled HTTPS and self-signed certificate. <details><summary>Config</summary> ```yaml jobs: name: local url: https://127.0.0.1:7072/metrics tlsskipverify: yes ``` </details> Note: When you define multiple jobs, their names must be unique. Collecting metrics from local and remote instances. <details><summary>Config</summary> ```yaml jobs: name: local url: http://127.0.0.1:7072/metrics name: remote url: http://192.0.2.1:7072/metrics ``` </details> To troubleshoot issues with the `cassandra` collector, run the `go.d.plugin` with the debug option enabled. The output should give you clues as to why the collector isn't working. Navigate to the `plugins.d` directory, usually at `/usr/libexec/netdata/plugins.d/`. If that's not the case on your system, open `netdata.conf` and look for the `plugins` setting under `[directories]`. ```bash cd /usr/libexec/netdata/plugins.d/ ``` Switch to the `netdata` user. ```bash sudo -u netdata -s ``` Run the `go.d.plugin` to debug the collector: ```bash ./go.d.plugin -d -m cassandra ```