#120Dashboard Blocks on Five Sequential Downstream Calls
system-design.hardSYSTEM-DESIGN
1app.get('/api/dashboard', async (req, res) => {
2 const user = await userService.get(req.userId);
3 const orders = await orderService.listRecent(req.userId);
4 const invoices = await invoiceService.listOpen(req.userId);
5 const recommendations = await mlService.recommend(req.userId);
6 const notifications = await notifyService.unread(req.userId);
7 res.json({ user, orders, invoices, recommendations, notifications });
8});
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#120PracticeHard22 min · 200 XP
Dashboard Blocks on Five Sequential Downstream Calls
The dashboard is the slowest page in the product, and whenever the recommendations service degrades the entire dashboard returns 500 even though it is a minor widget.
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