You want to design a cache invalidation system combining TTL and event-driven invalidation for a REST API with frequent updates. Which approach is optimal?

hard📝 Application Q8 of 15

Rest API - Caching Strategies

ARely solely on TTL to simplify cache management

BUse event-driven invalidation for critical updates and TTL as a fallback for stale data

CInvalidate cache only on server restarts

DUse manual invalidation exclusively without TTL

Step-by-Step Solution

Solution:

Step 1: Understand hybrid strategies
Combining TTL and event-driven invalidation leverages strengths of both: immediate invalidation and safety net for stale data.
Step 2: Evaluate options
Use event-driven invalidation for critical updates and TTL as a fallback for stale data uses event-driven invalidation for timely updates and TTL to prevent stale cache if events are missed.
Final Answer:
Use event-driven invalidation for critical updates and TTL as a fallback for stale data -> Option B
Quick Check:
Hybrid uses event-driven plus TTL fallback [OK]

Quick Trick: Combine event-driven with TTL fallback for freshness [OK]

Common Mistakes:

MISTAKES

Using only TTL causes stale data delays
Ignoring TTL risks stale cache if events fail
Invalidating only on server restart is inefficient

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You want to design a cache invalidation system combining TTL and event-driven invalidation for a REST API with frequent updates. Which approach is optimal?

Step 1: Understand hybrid strategies

Step 2: Evaluate options

Final Answer:

Quick Check:

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