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Youzan Coder

Official Youzan tech channel, delivering technical insights and occasional daily updates from the Youzan tech team.

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Latest from Youzan Coder

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Youzan Coder

Mar 29, 2022 · Databases

Redis Internals: Data Structures, Skip Lists, Dictionaries, Streams, and Thread Model

The article details Redis’s internal architecture, explaining how strings use SDS structures, sorted sets rely on skip‑lists, integers are stored in compact intsets, hash tables employ incremental rehashing, ziplist and listpack provide memory‑efficient encodings, the RAX radix tree underpins key lookup and streams, and the threading model has evolved from a single‑threaded event loop to multithreaded I/O for improved concurrency.

RedisSkip ListThread Model

0 likes · 35 min read

Redis Internals: Data Structures, Skip Lists, Dictionaries, Streams, and Thread Model

Youzan Coder

Mar 21, 2022 · R&D Management

How Shifting the Definition of Done Boosts Agile Team Throughput

This article examines how defining and progressively moving the Definition of Done (DoD) within agile feature teams can clarify goals, reduce unfinished work, improve iteration completion and delivery rates, and ultimately increase development throughput through concrete metrics and practical steps.

Iteration Metricsagiledefinition of done

0 likes · 11 min read

How Shifting the Definition of Done Boosts Agile Team Throughput

Youzan Coder

Mar 14, 2022 · Information Security

Android Privacy Protection: Privacy API and Permission HOOK Implementation Practice

To meet new Chinese privacy regulations, the article presents an mPaaS‑based solution that uses compile‑time Java HOOKs to replace privacy‑sensitive API calls and dangerous permission requests, automatically detecting and logging violations during build and runtime, and providing backend alerts and management tools for compliance.

ASMAndroidBytecode Manipulation

0 likes · 14 min read

Android Privacy Protection: Privacy API and Permission HOOK Implementation Practice

Youzan Coder

Mar 3, 2022 · Operations

How Standard Deviation Uncovers Hidden Bottlenecks in Software R&D Throughput

The article introduces a new R&D efficiency metric—throughput standard deviation—explains its statistical basis, shows how it was derived from annual reports, illustrates its application across multiple teams, and discusses practical insights and limitations for software development operations.

MetricsR&D efficiencyoperations

0 likes · 7 min read

How Standard Deviation Uncovers Hidden Bottlenecks in Software R&D Throughput

Youzan Coder

Feb 23, 2022 · Industry Insights

How Physical Kanban Boards Boost Agile Team Efficiency

This article examines how a software team transformed its daily stand‑ups by introducing physical Scrum and Lean Kanban boards, detailing the observed problems, step‑by‑step improvements, measurable outcomes, and future refinements to enhance transparency, focus, and value‑flow.

KanbanLeanagile

0 likes · 9 min read

How Physical Kanban Boards Boost Agile Team Efficiency

Youzan Coder

Feb 17, 2022 · Databases

Master MySQL Slow Query Optimization: Practical Indexing Techniques

This article shares hands‑on experience with MySQL 5.7 slow‑query problems, explaining common causes, proper index design, pitfalls that invalidate indexes, efficient SQL writing, deep‑pagination avoidance, and how to use EXPLAIN to verify that queries leverage the right indexes.

Database PerformanceExplain PlanIndex Optimization

0 likes · 16 min read

Master MySQL Slow Query Optimization: Practical Indexing Techniques

Youzan Coder

Feb 15, 2022 · Industry Insights

How to Boost Platform Efficiency: Lessons from Youzan’s Mid‑Platform Coordination

This article analyzes the efficiency challenges faced by Youzan’s mid‑platform approach, identifies three major pain points in demand planning, development cycle length, and uneven value delivery, and presents five practical interventions—including a company‑wide backlog, OKR alignment, proportional resource support, and co‑development—that reduced overall delivery time by 10% and highlighted new coordination issues for future improvement.

BacklogOKRResource Coordination

0 likes · 12 min read

How to Boost Platform Efficiency: Lessons from Youzan’s Mid‑Platform Coordination

Youzan Coder

Jan 31, 2022 · Big Data

Youzan Coder's 2021 Top 10 Technical Articles by Read Count

In a festive New‑Year message, Youzan Coder’s WeChat account celebrates the Tiger Year by presenting its six‑year journey and unveiling the 2021 top‑10 most‑read technical articles—ranging from ClickHouse implementation to UI automation, TCP networking, low‑code testing, thread‑pool optimization, elite testing practices, mobile permission systems, search quality assurance, and proactive mobile monitoring—each with thousands of views, and encourages readers to keep learning in 2022.

ClickHouseLow‑code platformReal-time Data Warehouse

0 likes · 7 min read

Youzan Coder

Jan 26, 2022 · Big Data

How to Build a Robust Data Quality Assurance Strategy for Large-Scale Data Platforms

This article outlines a comprehensive data quality assurance framework for a massive reporting platform, covering the data pipeline architecture, detailed testing methods for timeliness, completeness, and accuracy, as well as application‑level checks, downgrade and backup strategies, and future automation plans.

AutomationData WarehouseData quality

0 likes · 14 min read

How to Build a Robust Data Quality Assurance Strategy for Large-Scale Data Platforms

Youzan Coder

Jan 17, 2022 · Artificial Intelligence

Model Deployment Challenges and a Seldon‑Based Cloud‑Native Solution

The team replaced the cumbersome ABox deployment stack with Seldon‑based cloud‑native serving on Kubernetes, unifying TensorFlow and other framework models, adding GPU sharing, automated CRUD, per‑model ingress, monitoring, and log collection, achieving scalable, fault‑tolerant, zero‑downtime model deployment.

AI servingGPUKubernetes

0 likes · 11 min read

Model Deployment Challenges and a Seldon‑Based Cloud‑Native Solution