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Release It! 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! Figure 34, Order Management Hits ``Enterprise'' Scheduling System shows the relative sizes of the three systems involved.

The sole remaining server could handle up to twenty-five concurrent requests before it started to slow down and hang. We estimated that right at that moment, the order management system was probably sending ...

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