A microservice replays a sequence of events but the resulting state is inconsistent with expectations. Which of the following is the most probable reason?

medium📝 Analysis Q5 of 15

Microservices - Event-Driven Architecture

AThe event store is missing some events

BEvents were applied out of order during replay

CThe microservice has too many replicas

DThe network latency is too high

Step-by-Step Solution

Solution:

Step 1: Understand event replay ordering
Event replay requires applying events in the exact order they originally occurred to maintain consistent state.
Step 2: Identify cause of inconsistency
If state is inconsistent, the most common cause is that events were applied out of order, causing incorrect state transitions.
Final Answer:
Events were applied out of order during replay -> Option B
Quick Check:
Ordering is critical in event replay [OK]

Quick Trick: Event order must be preserved during replay [OK]

Common Mistakes:

MISTAKES

Assuming missing events are the main cause without checking order
Blaming network latency for state inconsistency
Thinking replicas affect replay correctness

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More Microservices Quizzes

A microservice replays a sequence of events but the resulting state is inconsistent with expectations. Which of the following is the most probable reason?

Step 1: Understand event replay ordering

Step 2: Identify cause of inconsistency

Final Answer:

Quick Check:

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