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What is the primary purpose of monitoring consumer lag in Kafka?

easy🧠 Conceptual Q1 of Q15
Kafka - Monitoring and Operations
What is the primary purpose of monitoring consumer lag in Kafka?
ATo monitor the CPU usage of Kafka brokers
BTo measure the total number of messages produced to a topic
CTo check how far behind a consumer group is from the latest messages
DTo verify the number of partitions in a Kafka topic
Step-by-Step Solution
Solution:

  1. Step 1: Understand consumer lag meaning

    Consumer lag shows how many messages a consumer group has not yet processed compared to the latest messages in the topic.

  2. Step 2: Identify the monitoring goal

    Monitoring lag helps ensure consumers keep up with producers and avoid delays in processing.

  3. Final Answer:

    To check how far behind a consumer group is from the latest messages -> Option C

  4. Quick Check:

    Consumer lag purpose = Check lag behind latest messages [OK]
Quick Trick: Lag means how many messages consumer is behind [OK]
Common Mistakes:
MISTAKES
  • Confusing lag with total messages produced
  • Thinking lag measures broker CPU usage
  • Mixing lag with partition count

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