You are designing a parallel running strategy for a microservices system with high traffic. Which approach best balances safety and performance?

hard📝 Trade-off Q15 of 15

Microservices - Migration from Monolith

ARoute 100% of traffic to new service and keep old service idle

BRun new service only during low traffic hours without output comparison

CRoute 10% of traffic to new service and 90% to old service, compare outputs, then gradually increase new service traffic

DStop old service immediately and monitor new service logs

Step-by-Step Solution

Solution:

Step 1: Understand gradual traffic shifting in parallel running
Gradually increasing traffic to the new service while comparing outputs reduces risk and performance impact.
Step 2: Evaluate options for safety and performance
Routing a small portion initially and increasing after validation balances safety and system load.
Final Answer:
Route 10% of traffic to new service and 90% to old service, compare outputs, then gradually increase new service traffic -> Option C
Quick Check:
Gradual traffic shift with output comparison = safe and performant [OK]

Quick Trick: Start small traffic to new service, compare, then increase [OK]

Common Mistakes:

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