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Poser une limite

November 2017, by Karl Dubost[ —]

The 911 outage, at the time the largest ever reported, was traced to software running on a server in Englewood, Colorado. Operated by a systems provider named Intrado, the server kept a running counter of how many calls it had routed to 911 dispatchers around the country. Intrado programmers had set a threshold for how high the counter could go. They picked a number in the millions.

Shortly before midnight on April 10, the counter exceeded that number, resulting in chaos. Because the counter was used to generate a unique identifier for each call, new calls were rejected. And because the programmers hadn’t anticipated the problem, they hadn’t created alarms to call attention to it. Nobody knew what was happening. Dispatch centers in Washington, California, Florida, the Carolinas, and Minnesota, serving 11 million Americans, struggled to make sense of reports that callers were getting busy signals. It took until morning to realize that Intrado’s software in Englewood was responsible, and that the fix was to change a single number.

James Somers, The Coming Software Apocalypse.

À chaque fois que vous posez une limite artificielle (parfois contrainte par la matérialité) dans un code, il est préférable de mettre en place un système d'alerte avant que cette limite soit atteinte. Le principe existe déjà quand il s'agit de transactions financières. Par exemple, lors du renouvellement de vos noms de domaine, la société généralement vous envoie une série d'alertes avant la date fatidique.

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