A system uses caching with a TTL (time to live) of 10 minutes and load balancing across 4 servers. If traffic doubles suddenly, what is the best way to maintain performance?

hard📝 Trade-off Q9 of 15

LLD - Advanced LLD Concepts

AIncrease cache size and add more servers behind the load balancer

BReduce cache TTL to 1 minute and remove servers

CDisable caching and use a single server

DIgnore traffic increase and keep system unchanged

Step-by-Step Solution

Solution:

Step 1: Address increased traffic
Doubling traffic means more requests to handle, risking overload.
Step 2: Use caching and scaling
Increasing cache size helps serve more requests quickly; adding servers spreads load.
Step 3: Avoid reducing cache TTL or removing servers
Reducing TTL increases DB load; fewer servers cause bottlenecks.
Final Answer:
Increase cache size and add more servers behind the load balancer -> Option A
Quick Check:
Scale cache and servers to handle traffic [OK]

Quick Trick: Scale cache and servers to handle more users [OK]

Common Mistakes:

Reducing cache TTL unnecessarily
Removing servers during high load
Ignoring traffic increase

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A system uses caching with a TTL (time to live) of 10 minutes and load balancing across 4 servers. If traffic doubles suddenly, what is the best way to maintain performance?

Step 1: Address increased traffic

Step 2: Use caching and scaling

Step 3: Avoid reducing cache TTL or removing servers

Final Answer:

Quick Check:

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