Hotpatching

Hotpatching is a technique used in computing to apply updates or fixes to running software without restarting the system or the application. This allows for continuous operation and minimizes downtime, which is especially critical for services that need to be available 24/7.

The process typically involves modifying the executable code in memory or replacing specific code segments. This can be achieved through various methods, depending on the operating system and programming language. For instance, some systems allow direct manipulation of memory addresses where code resides. Other approaches involve using specialized tools or scripting languages that can inject new code or overwrite existing sections.

Hotpatching is often employed for security patches, bug fixes, or minor feature enhancements. While it offers significant advantages in terms of availability, it also carries potential risks. Improperly applied hotpatches can introduce new bugs, cause instability, or even lead to system crashes. Therefore, rigorous testing and careful implementation are essential.

The concept of hotpatching is distinct from traditional patching, which usually requires a reboot or application restart. It's a more advanced technique that demands a deep understanding of software architecture and memory management. Major operating systems and software vendors sometimes utilize hotpatching to maintain service continuity for their users.

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