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Qunar Tech Salon

Qunar Tech Salon is a learning and exchange platform for Qunar engineers and industry peers. We share cutting-edge technology trends and topics, providing a free platform for mid-to-senior technical professionals to exchange and learn.

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Latest from Qunar Tech Salon

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Qunar Tech Salon

May 5, 2022 · Backend Development

Applying Domain-Driven Design (DDD) to Hotel Transaction Systems: Architecture and Code Implementation

This article explains how Domain-Driven Design is applied to a hotel transaction platform, detailing a four‑layer loose DDD architecture, the responsibilities of each layer, code implementation examples, and strategies for maintaining consistency across aggregates using events and factories.

DDDHotel Transactiondomain-driven design

0 likes · 9 min read

Applying Domain-Driven Design (DDD) to Hotel Transaction Systems: Architecture and Code Implementation

Qunar Tech Salon

Apr 27, 2022 · Fundamentals

Understanding Domain‑Driven Design: Strategic and Tactical Concepts for Complex Business Systems

This article introduces Domain‑Driven Design, explaining its strategic and tactical aspects, core concepts such as bounded contexts, ubiquitous language, aggregates, entities, and value objects, and illustrates how DDD can be applied to complex business domains like hotel transaction systems.

Strategic DesignTactical Designbounded context

0 likes · 17 min read

Understanding Domain‑Driven Design: Strategic and Tactical Concepts for Complex Business Systems

Qunar Tech Salon

Apr 20, 2022 · R&D Management

Designing Business Architecture for Activity Capability Layer: A Qunar Case Study

This article examines the concept of business architecture, its origins in TOGAF, and presents a detailed case study of Qunar’s activity capability layer design, highlighting pain points, architectural solutions, and a step-by-step methodology for building robust, reusable activity systems.

Business ArchitectureQunarSoftware Architecture

0 likes · 15 min read

Designing Business Architecture for Activity Capability Layer: A Qunar Case Study

Qunar Tech Salon

Apr 13, 2022 · Big Data

Design and Implementation of a High‑Performance, Scalable MySQL Log Analysis System

This document describes the background, problems, requirements, analysis, and detailed design of a high‑performance, highly available, and scalable log‑analysis pipeline for MySQL that leverages Kafka, ClickHouse, MySQL, and custom services to aggregate, enrich, and visualize massive query logs.

ClickHouseLog AnalysisMySQL

0 likes · 17 min read

Design and Implementation of a High‑Performance, Scalable MySQL Log Analysis System

Qunar Tech Salon

Apr 7, 2022 · Databases

Performance Analysis of Redis HSCAN vs HGETALL and Optimization Recommendations

This article examines why Redis HSCAN can cause high CPU usage on ziplist‑encoded hash objects, compares its performance with HGETALL through benchmark tests, and provides practical recommendations for avoiding costly full‑scan operations in production environments.

HSCANOptimizationRedis

0 likes · 10 min read

Performance Analysis of Redis HSCAN vs HGETALL and Optimization Recommendations

Qunar Tech Salon

Mar 30, 2022 · Databases

Understanding and Optimizing PostgreSQL VACUUM and AUTOVACUUM

This article explains the purpose and mechanics of PostgreSQL's VACUUM and AUTOVACUUM processes, demonstrates practical examples of table bloat, transaction ID handling, and provides step‑by‑step guidance for precise triggering and performance optimization of vacuum operations.

AUTOVACUUMSQLdatabase tuning

0 likes · 37 min read

Understanding and Optimizing PostgreSQL VACUUM and AUTOVACUUM

Qunar Tech Salon

Mar 23, 2022 · Backend Development

Case Study: DDD‑Driven Architectural Refactoring of the Hotel Pricing System at Qunar

This case study details how Qunar’s hotel pricing platform was reorganized in 2021 using Domain‑Driven Design and explicit architecture principles to streamline cross‑team collaboration, reduce data‑flow complexity, and improve response time by 25%, while aligning system structure with Conway’s Law.

Conway's LawDDDHotel Pricing

0 likes · 14 min read

Case Study: DDD‑Driven Architectural Refactoring of the Hotel Pricing System at Qunar

Qunar Tech Salon

Mar 22, 2022 · Backend Development

Interview with Zheng Jimin on Domain-Driven Design Practices and Technical Brand Building at Qunar

In this interview, Qunar's technical director Zheng Jimin shares how the company revived Domain‑Driven Design to restructure hotel pricing, discusses strategic and tactical design, implementation challenges, success criteria, and the broader impact of technical influence on organizational growth.

DDDQunardomain-driven design

0 likes · 14 min read

Qunar Tech Salon

Mar 17, 2022 · Databases

Killing Slow Queries in MySQL: Problems, Drawbacks, and Practical Design Solutions

The article analyses why indiscriminately killing slow MySQL queries is risky, enumerates the drawbacks of common kill‑based approaches, and proposes more reliable designs such as registration, signature‑based killing, and source‑code modifications to safely mitigate query‑induced database avalanches.

MySQLSQL signaturedatabase performance

0 likes · 16 min read

Killing Slow Queries in MySQL: Problems, Drawbacks, and Practical Design Solutions

Qunar Tech Salon

Mar 10, 2022 · Operations

Design and Implementation of Cisco Nexus VPC for Qunar K8S Network

This article details the background, design rationale, network topology changes, and step‑by‑step procedures—including VPC configuration, BGP setup, and port‑channel adjustments—used to upgrade Qunar's data‑center network for Kubernetes deployments, with practical code examples and operational tips.

BGPCiscoDataCenter

0 likes · 11 min read

Design and Implementation of Cisco Nexus VPC for Qunar K8S Network