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Given two consumers in the same group consuming from a topic with 3 partitions, how many partitions will each consumer be assigned?

medium📝 Predict Output Q4 of 15
Kafka - Consumer Groups
Given two consumers in the same group consuming from a topic with 3 partitions, how many partitions will each consumer be assigned?
AConsumer 1: 3 partitions, Consumer 2: 0 partitions
BConsumer 1: 2 partitions, Consumer 2: 1 partition
CConsumer 1: 1 partition, Consumer 2: 1 partition
DConsumer 1: 0 partitions, Consumer 2: 3 partitions
Step-by-Step Solution
Solution:

  1. Step 1: Understand partition assignment in consumer groups

    Partitions are divided among consumers as evenly as possible. With 3 partitions and 2 consumers, one gets 2 partitions, the other 1. Assigning all partitions to one consumer or leaving partitions unassigned is incorrect.

  2. Final Answer:

    Consumer 1: 2 partitions, Consumer 2: 1 partition -> Option B

  3. Quick Check:

    Partitions split evenly among consumers = 2 and 1 [OK]
Quick Trick: Partitions divide evenly; extra goes to one consumer [OK]
Common Mistakes:
  • Assuming all partitions go to one consumer
  • Splitting partitions equally without remainder
  • Assigning zero partitions to active consumers

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