hotpatches

Hotpatching is a technique for applying updates to running software without stopping or restarting the affected processes. This allows for bug fixes, security patches, or minor feature additions to be implemented in live systems, minimizing downtime and disruption to users. The core principle of hotpatching is to modify the program's code in memory while it is executing.

Different programming languages and operating systems offer varying levels of support for hotpatching. Some systems provide built-in mechanisms, while others require custom solutions or specialized tools. The complexity of a hotpatch can range from simple variable changes to the replacement of entire functions or code segments.

While offering significant advantages in terms of availability, hotpatching is not without its challenges. Ensuring the integrity and stability of the running program after a patch is crucial. Improperly applied hotpatches can lead to unexpected behavior, crashes, or security vulnerabilities. Thorough testing and careful planning are essential for successful hotpatching implementations. This technique is particularly valuable in environments where continuous operation is critical, such as critical infrastructure, financial systems, or high-availability web services.