You design a microservice system where orders are created and inventory is updated asynchronously. How do you ensure inventory is never oversold despite eventual consistency?

hard📝 Trade-off Q8 of 15

Microservices - Event-Driven Architecture

AAllow orders without checking inventory and fix later

BUse distributed locks to reserve inventory before order creation

CUpdate inventory synchronously in the order service

DIgnore inventory updates to speed up processing

Step-by-Step Solution

Solution:

Step 1: Identify the risk of overselling
Asynchronous updates can cause race conditions leading to overselling inventory.
Step 2: Apply a solution to prevent overselling
Distributed locks can reserve inventory before order creation, preventing conflicts.
Final Answer:
Use distributed locks to reserve inventory before order creation -> Option B
Quick Check:
Distributed locks prevent overselling in async systems [OK]

Quick Trick: Reserve inventory with locks before async order creation [OK]

Common Mistakes:

MISTAKES

Ignoring inventory checks
Relying on synchronous updates only
Allowing overselling to fix later

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More Microservices Quizzes

You design a microservice system where orders are created and inventory is updated asynchronously. How do you ensure inventory is never oversold despite eventual consistency?

Step 1: Identify the risk of overselling

Step 2: Apply a solution to prevent overselling

Final Answer:

Quick Check:

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