Microservices - Event-Driven Architecture
Why is it important to design idempotent event consumers with a persistent store for processed event IDs rather than an in-memory cache?
Why is it important to design idempotent event consumers with a persistent store for processed event IDs rather than an in-memory cache?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand volatility of in-memory caches
In-memory caches lose all data if the service crashes or restarts.Step 2: Importance of persistence for idempotency
Without persistence, the consumer may reprocess events after restart, breaking idempotency guarantees.Final Answer:
Because in-memory caches lose data on crashes, risking duplicate processing after restart -> Option CQuick Check:
Persistence ensures idempotency survives restarts [OK]
Quick Trick: Use persistent store to survive crashes [OK]
Common Mistakes:
MISTAKES- Assuming in-memory cache is durable
- Believing persistent stores are slower always
- Thinking persistent stores order events automatically
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