Sharing insights and experiences from Dada Group's R&D department on product refinement and technology advancement, connecting with fellow geeks to exchange ideas and grow together.
This article describes the design, implementation, and practical benefits of a frontend‑focused interface testing tool used at JD.com to simulate public parameters, copy request parameters, and automatically compare actual and expected JSON responses, thereby reducing API confirmation cycles and improving testing efficiency.
This article details the implementation of a custom circuit breaker to prevent system failures in distributed systems, covering design principles, Java and Python implementations, and its effectiveness during high traffic periods.
The talk presented at the Global Architect Summit detailed JD Daojia's backend architecture evolution, covering physical deployment, microservice adoption, gateway design, LBS caching, order system structure, idempotency, data consistency, high‑availability strategies, gray releases, rate limiting, and stress testing, illustrating practical engineering challenges and solutions.
This article explains the purpose of performance (stress) testing, compares four testing approaches, details the chosen proportional‑deployment strategy, and provides comprehensive preparation steps, script guidelines, metric analysis, and practical tips for ensuring system stability during large‑scale traffic spikes.
The article shares practical insights on planning, designing, developing, testing, and rolling out a large‑scale backend system refactor, emphasizing resource limits, pain points of legacy code, unit‑test protection, layering, decoupling, monitoring, and staged deployment to ensure stability during high‑traffic events.
This article explains how Dada's order platform was refactored from a Python Flask service to a Java‑based microservice architecture, employing load testing, circuit breaking with Hystrix, and multi‑datacenter disaster recovery to reliably handle eight million orders in a single day during the Double‑11 shopping festival.
At PyCon China 2023, Dada‑JD Daojia’s algorithm team presented their AI‑driven practices for dynamic pricing, route planning, and order assignment, detailing how multi‑dimensional supply‑demand balancing, genetic‑algorithm‑based TSP solutions, and multi‑objective optimization improve real‑time logistics efficiency.
This article examines the requirements for globally unique IDs in distributed systems, compares classic generation schemes such as UUID, Flickr, Snowflake and TDDL, and details a customized Snowflake‑based implementation with ZooKeeper‑managed worker IDs, clock‑rollback handling, deployment optimizations, and JVM tuning to achieve high performance and reliability.
Pinpoint is a full‑stack, non‑intrusive tracing platform that visualizes service topology, active threads, request latency, and application health, and this article explains its architecture, data model, and step‑by‑step process for creating custom plugins—including ServiceLoader configuration, TraceMetadataProvider, and ProfilerPlugin implementations with code examples.
The article describes how Dada Mall and its crowdsourcing task platform adopted a flexible plugin architecture to modularize product-specific logic, simplify maintenance, enable dynamic configuration, and support rapid business expansion without extensive refactoring.
