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What is the main goal of Exactly-once semantics (EOS) in Kafka?

easy🧠 Conceptual Q11 of Q15
Kafka - Message Delivery Semantics
What is the main goal of Exactly-once semantics (EOS) in Kafka?
ATo compress messages for storage efficiency
BTo prevent duplicate or lost messages during data processing
CTo allow multiple consumers to read the same message simultaneously
DTo increase the speed of message delivery
Step-by-Step Solution
Solution:

  1. Step 1: Understand the purpose of EOS

    Exactly-once semantics ensures that each message is processed exactly one time, avoiding duplicates or losses.

  2. Step 2: Compare options with EOS goal

    Options A, B, and C describe other Kafka features but not EOS's main goal.

  3. Final Answer:

    To prevent duplicate or lost messages during data processing -> Option B

  4. Quick Check:

    EOS = prevent duplicates/losses [OK]
Quick Trick: EOS means no duplicates or lost messages [OK]
Common Mistakes:
MISTAKES
  • Confusing EOS with message speed optimization
  • Thinking EOS allows multiple consumers to read simultaneously
  • Mixing EOS with message compression features

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