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xk6-output-clickhouse

xk6-output-clickhouse is a k6 extension to send k6 metrics to clickhouse in a predefined schema.

Install

You will need go

# Install xk6
go install go.k6.io/xk6/cmd/xk6@latest

# Build the k6 binary
xk6 build --with github.com/grafana/xk6-output-clickhouse

... [INFO] Build environment ready
... [INFO] Building k6
... [INFO] Build complete: ./k6

You will have a k6 binary in the current directory.

Database configure

If custom database (not default) is used

CREATE DATABASE IF NOT EXISTS k6 ON CLUSTER cluster
USE k6

Create replicated schema

CREATE TABLE IF NOT EXISTS k6_samples (
    id UInt64,
    start DateTime64(9, 'UTC'),
    ts DateTime64(9, 'UTC'),
    metric String,
    url String,
    label String,
    status String,
    name String,
    tags Map(String, String),
    value Float64
) ENGINE = ReplicatedReplacingMergeTree('/clickhouse/tables/{shard}/k6_samples', '{replica}', start)
PARTITION BY toYYYYMM(start)
ORDER BY (id, start, ts, metric, url, label, status, name);

CREATE TABLE IF NOT EXISTS k6_tests (
    id UInt64,
    ts DateTime64(9, 'UTC'),
    name String,
    params String
) ENGINE = ReplicatedReplacingMergeTree('/clickhouse/tables/{shard}/k6_tests', '{replica}', id)
PARTITION BY toYYYYMM(ts)
ORDER BY (id, ts, name);

If no tables at start, atotomatic create database and non-replicated schema, like this

CREATE DATABASE IF NOT EXISTS k6
USE k6

CREATE TABLE IF NOT EXISTS k6_samples (
    id UInt64,
    start DateTime64(9, 'UTC'),
    ts DateTime64(9, 'UTC'),
    metric String,
    url String,
    label String,
    status String,
    name String,
    tags Map(String, String),
    value Float64
) ENGINE = ReplacingMergeTree(start)
PARTITION BY toYYYYMM(start)
ORDER BY (id, start, ts, metric, url, label, status, name);

CREATE TABLE IF NOT EXISTS k6_tests (
    id UInt64,
    ts DateTime64(9, 'UTC'),
    name String,
    params String
) ENGINE = ReplacingMergeTree(ts)
PARTITION BY toYYYYMM(ts)
ORDER BY (id, ts, name);

Configuration

First, find the Clickhouse-go DSN connection string of the clickhouse instance.

To run the test and send the k6 metrics to clickhouse, use the k6 run command setting the k6 output option as clickhouse=YOUR_CLICKHOUSE_CONNECTION_STRING. For example:

k6 run -o "clickhouse=http://k6:k6@localhost:8123/default?dial_timeout=200ms&max_execution_time=60" script.js

or set an environment variable:

K6_OUT="clickhouse=http://k6:k6@localhost:8123/default?dial_timeout=200ms&max_execution_time=60" k6 run script.js

For non-default database

K6_OUT="clickhouse=http://k6:k6@localhost:8123/k6?dial_timeout=200ms&max_execution_time=60" k6 run script.js

Options

The xk6-output-clickhouse extension supports this additional option:

  • K6_OUT_CLICKHOUSE_PUSH_INTERVAL: to define how often metrics are sent to clickhouse. The default value is 10s (10 second).
  • K6_OUT_CLICKHOUSE_TESTNAME: to set test name prefix prepended to id (formated start timestamp).
  • K6_OUT_CLICKHOUSE_PARAMS: to set test params.