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A developer attempts to modify an event already stored in an event store but encounters an error. What is the most probable reason?

medium📝 Analysis Q6 of 15
Microservices - Event-Driven Architecture
A developer attempts to modify an event already stored in an event store but encounters an error. What is the most probable reason?
AThe developer lacks write permissions
BThe event store is offline
CEvents are immutable and cannot be changed once stored
DThe event store requires manual approval for edits
Step-by-Step Solution
Solution:

  1. Step 1: Recall event store properties

    Events are immutable by design to ensure auditability and consistency.

  2. Step 2: Evaluate error cause

    Attempting to modify an event violates immutability, causing errors.

  3. Final Answer:

    Events are immutable and cannot be changed once stored -> Option C

  4. Quick Check:

    Event immutability prevents edits [OK]
Quick Trick: Event immutability prevents edits [OK]
Common Mistakes:
MISTAKES
  • Assuming permission issues cause errors
  • Believing events can be updated after storage
  • Thinking event store requires approvals for edits

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