Source Code Hotspots: A Diagnostic Method for Quality Issues

2026-02-13

Technology Category

Data Mining & Knowledge Management: Anomaly/Outlier DetectionNatural Language Processing: Code Generation / Program Synthesis from Natural LanguagePlanning, Routing, and Scheduling: Optimization of Spatio-temporal Systems

Application Category

Web Mining and Content Analysis: Robustness and generalizability of Web mining methodsGraph Algorithms and Modeling for the Web: Representation, reconstruction, and subgraph or motif discovery in Web-related graphsUser Modeling, Personalization and Recommendation: Attacks and countermeasures in recommendation systems

Abstract

Software source code often harbours"hotspots": small portions of the code that change far more often than the rest of the project and thus concentrate maintenance activity. We mine the complete version histories of 91 evolving, actively developed GitHub repositories and identify 15 recurring line-level hotspot patterns that explain why these hotspots emerge. The three most prevalent patterns are Pinned Version Bump (26%), revealing brittle release practices; Long Line Change (17%), signalling deficient layout; and Formatting Ping-Pong (9%), indicating missing or inconsistent style automation. Surprisingly, automated accounts generate 74% of all hotspot edits, suggesting that bot activity is a dominant but largely avoidable source of noise in change histories. By mapping each pattern to concrete refactoring guidelines and continuous integration checks, our taxonomy equips practitioners with actionable steps to curb hotspots and systematically improve software quality in terms of configurability, stability, and changeability.

Problem

• source code hotspots
• software quality
• change history
• maintenance activity
• code churn

Innovation

• code hotspots
• version history mining
• refactoring guidelines
• automated bots
• software quality diagnostics