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Microservicessystem_design~12 mins

Mono-repo vs multi-repo in Microservices - Architecture Patterns Compared

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System Overview - Mono-repo vs multi-repo

This system compares two ways to organize code repositories for microservices: mono-repo and multi-repo. Mono-repo stores all microservices in one big repository, making shared code and coordination easier. Multi-repo keeps each microservice in its own repository, allowing independent development and deployment.

Architecture Diagram
User
  |
  v
+-----------------+       +-----------------+
| Mono-Repo Setup |       | Multi-Repo Setup|
|  (Single Repo)  |       | (Multiple Repos) |
+-----------------+       +-----------------+
       |                           |
       v                           v
+-----------------+       +-----------------+
| Shared Codebase & CI/CD System  |       | Independent     |
|                                 |       | CI/CD Pipelines |
+-----------------+       +-----------------+
       |                           |
       v                           v
+-----------------+       +-----------------+
| Microservice A  |       | Microservice A  |
+-----------------+       +-----------------+
+-----------------+       +-----------------+
| Microservice B  |       | Microservice B  |
+-----------------+       +-----------------+
+-----------------+       +-----------------+
| Microservice C  |       | Microservice C  |
+-----------------+       +-----------------+
Components
User
actor
Developer or team interacting with the code repositories
Mono-Repo Setup
repository
Single repository containing all microservices and shared code
Multi-Repo Setup
repository
Multiple repositories, each for one microservice
Shared Codebase & CI/CD System
service
Centralized shared libraries and continuous integration/delivery pipeline for mono-repo
Independent CI/CD Pipelines
service
Separate build and deployment pipelines for each microservice in multi-repo
Microservice A
service
One microservice component
Microservice B
service
Another microservice component
Microservice C
service
Another microservice component
Request Flow - 4 Hops
User → Mono-Repo Setup
Mono-Repo Setup → Shared Codebase & CI/CD System
User → Multi-Repo Setup
Multi-Repo Setup → Independent CI/CD Pipelines
Failure Scenario
Component Fails:Shared Codebase & CI/CD System
Impact:In mono-repo, build and deployment for all microservices may be blocked, delaying releases.
Mitigation:Implement incremental builds and caching; use feature flags to isolate failures.
Architecture Quiz - 3 Questions
Test your understanding
Which repository setup allows easier sharing of common code across microservices?
AMulti-repo
BMono-repo
CNeither
DBoth equally
Design Principle
This comparison shows how repository organization affects development speed, code sharing, and deployment independence. Mono-repos simplify sharing but can create bottlenecks, while multi-repos enable independent workflows but require more coordination.