KairosDB

What the maker publishes

Aggregators

Built-in aggregators include min, max, sum, count, and mean. source

Aggregators

Available aggregation functions include min, max, sum, count, and mean. source

Data collection

It accepts data through Telnet, REST, Graphite, and plugins. source

Data ingestion

Data can be submitted through Telnet, REST, Graphite, or plugins. source

Deployment

The documentation says KairosDB runs under Kubernetes and is mostly stateless, while Cassandra can be harder to run efficiently there. source

Extensibility

Guice-based plugins can add data point listeners, datastores, protocol handlers, and system monitors. source

Extensibility

Guice-based plugins can add data point listeners, data stores, and protocol handlers. source

Import and export

The server provides command-line tools to import and export data. source

Java client

A separate Java client library is available to send metrics and query data points. source

Java client

KairosDB provides a Java client library using HttpClient to send metrics and query the server. source

License

The project repository identifies the license as Apache License 2.0. source

License

The repository identifies the license as Apache License 2.0. source

Notable configuration limit

The Cassandra row width can be changed when the schema is created, but not afterward. source

Notable limit

The Cassandra row width defaults to about three weeks and cannot be changed after the schema is created without risking data loss. source

Product

KairosDB is a distributed time-series database built on Cassandra. source

Purpose

KairosDB is a fast, distributed, scalable time-series database built on Cassandra. source

Queries

The REST API can query metric data by metric name and time range, optionally filtering by tags, and supports aggregation and downsampling. source

Queries

The REST API supports querying by metric and time range, with optional tags, aggregation, averaging, min and max calculations, and downsampling. source

Requirements

The installation guide says KairosDB runs with Java 1.8 or later. source

Runtime requirement

KairosDB runs with Java 1.8 or later. source

Security

The KairosDB pages reviewed do not state security certifications or compliance claims. source

Storage backends

The documentation describes H2 as the default in-memory datastore and Cassandra as an alternative for persistent storage. source

Storage backends

KairosDB can use an in-memory H2 database or Cassandra to store data points. source

Support

The project README directs users to a KairosDB discussion group for questions and community involvement. source

Checked against the maker's pages on 11 Oct 2026.