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What is the likely cause of this error in a Kafka consumer?

medium📝 Debug Q14 of 15
Kafka - Consumers

What is the likely cause of this error in a Kafka consumer?

org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition

Given the consumer uses IntegerDeserializer but the producer sends String keys.

AMismatch between producer's String keys and consumer's IntegerDeserializer
BKafka topic does not exist
CConsumer group ID is missing
DNetwork connection failure
Step-by-Step Solution
Solution:

  1. Step 1: Analyze deserialization error cause

    The error occurs when deserializer cannot convert bytes to expected type.

  2. Step 2: Check key type mismatch

    Producer sends String keys, but consumer expects Integer keys, causing failure.

  3. Final Answer:

    Mismatch between producer's String keys and consumer's IntegerDeserializer -> Option A

  4. Quick Check:

    Deserializer mismatch = SerializationException [OK]
Quick Trick: Producer and consumer deserializers must match data type [OK]
Common Mistakes:
  • Ignoring type mismatch between producer and consumer
  • Blaming unrelated network or topic errors
  • Confusing serialization with deserialization errors

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