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What is the output when a Kafka consumer tries to read a message with a schema version incompatible with its expected schema?

medium📝 Predict Output Q5 of Q15
Kafka - Schema Registry
What is the output when a Kafka consumer tries to read a message with a schema version incompatible with its expected schema?
AThe consumer throws a schema compatibility error and fails to deserialize.
BThe consumer reads the message but ignores unknown fields.
CThe consumer automatically updates its schema to match the message.
DThe consumer skips the message silently.
Step-by-Step Solution
Solution:

  1. Step 1: Understand consumer schema compatibility

    Consumers must deserialize messages using compatible schemas.

  2. Step 2: Identify behavior on incompatibility

    If schemas are incompatible, deserialization fails with an error.

  3. Final Answer:

    The consumer throws a schema compatibility error and fails to deserialize. -> Option A

  4. Quick Check:

    Incompatible schema = Consumer error [OK]
Quick Trick: Consumer fails on incompatible schema [OK]
Common Mistakes:
MISTAKES
  • Assuming consumer auto-updates schema
  • Thinking consumer silently skips messages
  • Believing consumer ignores unknown fields always

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