Hanna, Carol; Clark, David; Sarro, Federica; Petke, Justyna; (2025) Hot Fixing Software: A Comprehensive Review of Terminology, Techniques, and Applications. ACM Transactions on Software Engineering and Methodology , Article 3786330. 10.1145/3786330.

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Abstract

A hot fix is an unplanned improvement to a specific time-critical issue deployed to a software system in production. While hot fixing is an essential and common activity in software maintenance, it has never been surveyed as a research activity. Thus, such a review is long overdue. In this paper, we conduct a comprehensive literature review of work on hot fixing. We highlight the fields where this topic has been addressed, inconsistencies we identified in the terminology, gaps in the literature, and directions for future work. Our search concluded with 140 articles on the topic between the years 1986 and 2024. The articles found encompass many different research areas such as log analysis, runtime patching (also known as hot patching), and automated repair, as well as various application domains such as security, mobile, and video games. We find that many directions can take hot fix research forward such as unifying existing terminology, establishing a benchmark set of hot fixes, researching costs and frequency of hot fixes, and researching the possibility of end-to-end automation of detection, mitigation, and deployment. We discuss these avenues in detail to inspire the community to systematize hot fixing as a software engineering activity.

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