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Given the following trace spans collected by Zipkin, what is the total time taken by the root request?

medium📝 Analysis Q13 of 15
Microservices - Monitoring and Observability
Given the following trace spans collected by Zipkin, what is the total time taken by the root request?
Span A (root): start=0ms, duration=50ms
Span B (child of A): start=10ms, duration=20ms
Span C (child of A): start=35ms, duration=10ms
A50ms
B40ms
C30ms
D60ms
Step-by-Step Solution
Solution:

  1. Step 1: Understand root span duration

    The root span duration represents the total time of the entire request, including child spans.

  2. Step 2: Analyze given spans

    Span A starts at 0ms and lasts 50ms, so total time is 50ms regardless of child spans.

  3. Final Answer:

    50ms -> Option A

  4. Quick Check:

    Root span duration = total request time = 50ms [OK]
Quick Trick: Root span duration = total request time [OK]
Common Mistakes:
MISTAKES
  • Adding child spans durations incorrectly
  • Ignoring root span duration
  • Confusing start times with total duration

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