System Architecture Design Overview and Principles for an Online Education Platform

Background : The existing product lines have accumulated technical debt, with isolated simple architectures that are costly to maintain. Rapid growth of online education in 2020 exposed performance and reliability issues, prompting a strategic plan to launch an integrated "Smart Education Brain" and expand to the consumer market.

Design Goals :

High availability: system uptime >99% (downtime <12 hours per year).

Scalability: clear, loosely‑coupled components that can be horizontally expanded.

Cost efficiency: open platform, reusable code, and mature open‑source technologies.

Performance: 90th‑percentile response <200 ms, 99th‑percentile <500 ms.

Security: protection against common internet threats and rapid response to new risks.

Design Principles :

Fit‑for‑purpose: choose solutions that match current resources and can be delivered quickly.

Simplicity: prefer simple designs when they meet requirements.

Evolutionary: allow incremental improvements rather than a big‑bang rewrite.

Stability: prioritize stable operation over excessive design.

Fault tolerance: design to survive hardware/software failures.

Design Scheme :

Application Architecture : Diagram illustrating layered services (not shown).

Infrastructure Architecture : Diagram of underlying platforms (not shown).

Service Network Topology : Includes load balancer, API gateway, micro‑services, service registry, configuration center, storage clusters, etc.

Front‑Back Service Framework : Simple, stable, gradually evolving toward micro‑services.

Unified Technology Stack :

Frontend: Vue, cross‑platform frameworks (uniapp, React Native) Backend: Java 8, Spring Boot, MySQL, MongoDB, Redis, RabbitMQ, Elasticsearch

Standardization & Governance :

Scaffolding: user/role/department management, dictionary, code generation, multi‑DB adapters. Process: defined R&D workflow (requirement → design → development → testing → release) with coding standards.

Modular Common Services :

Shared packages & services: Maven repository, SSO, workflow, SMS, email, OAuth2, task scheduling, push, rule engine, config center, message center.

Micro‑service Enablement :

Service governance components: registry, invocation, deployment, logging, monitoring, tracing.

Database Architecture :

Supported databases: MySQL, MongoDB, Redis, Elasticsearch (relational, NoSQL, OLAP/OLTP).

High availability: primary‑secondary replication with automatic failover.

Reliability: real‑time monitoring, backup & restore, minimal permission control.

Performance & scalability: sharding‑jdbc for read/write splitting, partitioning.

R&D Infrastructure :

Code repository standards, Jenkins CI/CD automation.

Separate test and production environments.

Optional continuous integration pipelines.

Overall, the architecture aims to provide a stable, scalable, and cost‑effective foundation that can evolve from a simple monolithic system to a fully micro‑service‑oriented platform supporting massive online education workloads.