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ClickHouse
Knowledge Tutorial

ClickHouse is a high-performance OLAP database designed for real-time analytics. The project includes a sophisticated CI/CD infrastructure powered by the Praktika framework to orchestrate builds and tests. It utilizes Docker for deployment and runs extensive integration and stateless query tests to verify distributed features, external integrations, and core database functionality.

14

Chapters

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Subsystems

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Rabbit Holes

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System Architecture

How the pieces fit

ClickHouse is organized as connected concepts and components. Start broad, then drill down chapter by chapter.

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Praktika Framework

Praktika Framework

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CI Workflows

CI Workflows

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Build Configuration

Build Configuration

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Build Job Script

Build Job Script

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Docker Server Image

Docker Server Image

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Stateless Queries

Stateless Queries

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Integration Test Job Script

Integration Test Job Script

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Integration Tests

Integration Tests

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Core Feature Tests

Core Feature Tests

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Analyzer Tests

Analyzer Tests

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ClickHouse Keeper Tests

ClickHouse Keeper Tests

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Protocol Tests

Protocol Tests

ClickHouse — bash

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Repository Overview

Intro and Architecture Diagram

ClickHouse is a high-performance OLAP database designed for real-time analytics. The project includes a sophisticated CI/CD infrastructure powered by the Praktika framework to orchestrate builds and tests. It utilizes Docker for deployment and runs extensive integration and stateless query tests to verify distributed features, external integrations, and core database functionality.

Source Repository: https://github.com/ClickHouse/ClickHouse

flowchart TD A0["Build Configuration"] A1["Docker Server Image"] A2["Praktika Framework"] A3["CI Workflows"] A4["Build Job Script"] A5["Integration Test Job Script"] A6["Integration Tests"] A7["Core Feature Tests"] A8["External Integrations Tests"] A9["Protocol Tests"] A10["Stateless Queries"] A11["ClickHouse Keeper Tests"] A12["Analyzer Tests"] A13["Integration Test Helpers"] A2 -->|"Defines pipeline"| A3 A3 -->|"Triggers build"| A4 A4 -->|"Uses configuration"| A0 A3 -->|"Triggers testing"| A5 A5 -->|"Deploys container"| A1 A5 -->|"Runs suite"| A6 A6 -->|"Uses utilities"| A13 A5 -->|"Runs suite"| A7 A7 -->|"Uses utilities"| A13 A5 -->|"Runs suite"| A8 A5 -->|"Runs suite"| A9 A3 -->|"Executes queries"| A10 A5 -->|"Runs suite"| A11 A5 -->|"Runs suite"| A12

Tutorial Chapters

All 14 chapters

Follow sequentially or jump to any topic. Start with Praktika Framework.

Praktika Framework

Welcome to the ClickHouse development tutorials! If you are looking to contribute to ClickHouse or understand how this massive project ensu…

In the previous chapter, we introduced the Praktika Framework as the brain behind our CI system. We learned that it acts as a "Traffic Cont…

Build Configuration

In the previous chapter, CI Workflows, we learned how Praktika schedules work based on events like Pull Requests. The first and most import…

Build Job Script

In the previous chapter, Build Configuration, we created the "Instruction Manual" (CMake) for our project. We defined how to switch between…

Docker Server Image

In the previous chapter, Build Job Script, we successfully compiled the ClickHouse source code into a binary executable. We have the "brain…

Stateless Queries

In the previous chapter, Docker Server Image, we successfully packaged our compiled binary into a portable container. We have a running dat…

Integration Test Job Script

In the previous chapter, Stateless Queries, we learned how to check if ClickHouse can answer simple questions like 1 + 1. We ran these test…

Integration Tests

In the previous chapter, Integration Test Job Script, we built the "Site Manager" that orchestrates our testing environment. We learned how…

Core Feature Tests

In the previous chapter, Integration Tests, we learned how to spin up a "virtual world" of multiple ClickHouse servers using Python. We ran…

In the previous chapter, Core Feature Tests, we tested the "Pillars" of ClickHouse, such as backups and security. We made sure the database…

ClickHouse Keeper Tests

In the previous chapter, Analyzer Tests, we ensured that the "New Brain" of ClickHouse understands complex SQL queries correctly. We verifi…

In the previous chapter, ClickHouse Keeper Tests, we ensured that our servers can coordinate and agree on a leader. We verified the interna…

External Integrations Tests

In the previous chapter, Protocol Tests, we ensured that clients (like MySQL tools or web browsers) could talk to ClickHouse. We verified t…

Integration Test Helpers

In the previous chapter, External Integrations Tests, we learned how to test ClickHouse against real-world external systems like S3 and Kaf…

About This Project

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