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Why might replaying events from an event store be slow as data grows?

medium📝 Analysis Q7 of 15
Microservices - Event-Driven Architecture
Why might replaying events from an event store be slow as data grows?
ABecause event stores use slow disk drives only
BBecause events are stored in random order
CBecause all events must be processed to rebuild state
DBecause event stores delete old events automatically
Step-by-Step Solution
Solution:

  1. Step 1: Understand replay process

    Replaying means processing all events from start to rebuild current state.

  2. Step 2: Identify performance cause

    As event count grows, replaying all events takes longer, causing slowness.

  3. Final Answer:

    Because all events must be processed to rebuild state -> Option C

  4. Quick Check:

    Replay speed depends on event count [OK]
Quick Trick: More events = slower replay unless snapshots used [OK]
Common Mistakes:
MISTAKES
  • Blaming hardware only
  • Thinking events are unordered
  • Assuming old events are deleted

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