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A developer tries to start Kafka but gets an error: 'Zookeeper connection failed'. What is the likely cause?

medium📝 Debug Q6 of 15
Kafka - Basics and Event Streaming
A developer tries to start Kafka but gets an error: 'Zookeeper connection failed'. What is the likely cause?
AKafka broker configuration file is missing
BZookeeper service is not running or unreachable
CKafka topic does not exist yet
DProducer is sending invalid messages
Step-by-Step Solution
Solution:

  1. Step 1: Understand Kafka's dependency on Zookeeper

    Kafka requires Zookeeper to manage cluster metadata and coordination.

  2. Step 2: Analyze error message

    'Zookeeper connection failed' means Kafka cannot reach Zookeeper, likely because it is down or unreachable.

  3. Final Answer:

    Zookeeper service is not running or unreachable -> Option B

  4. Quick Check:

    Zookeeper error = Service down/unreachable [OK]
Quick Trick: Check Zookeeper is running before starting Kafka [OK]
Common Mistakes:
  • Ignoring Zookeeper dependency
  • Blaming missing config files
  • Confusing topic existence with connection issues

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