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Release It!, 2nd Edition by Michael T. Nygard

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Call In a Specialist

It felt like half of forever (but was probably only half an hour) when the support engineer dialed in to the bridge. He explained that of the four servers that normally handle scheduling, two were down for maintenance over the holiday weekend and one of the others was malfunctioning for reasons unknown. To this day, I have no idea why they would schedule maintenance for that weekend of all weekends!

That left us with a huge imbalance in the sizes of the systems, as shown in the following figure. The sole scheduling server that remained could handle up to twenty-five concurrent requests before it started to slow down and hang. We estimated that right then the order management system was probably sending it ninety requests. ...

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