Which of the following is the correct way to declare a new optional field with a default value in an Avro schema for forward compatibility?

easy📝 Syntax Q12 of Q15

Kafka - Schema Registry

A{"name": "age", "type": "string", "default": "unknown"}

B{"name": "age", "type": "int", "default": null}

C{"name": "age", "type": "int", "default": 0}

D{"name": "age", "type": "int"}

Step-by-Step Solution

Solution:

Step 1: Identify forward compatibility rule
Forward compatibility requires new fields to have default values so new consumers can read data produced with the old schema.
Step 2: Check options for default value and type
{"name": "age", "type": "int", "default": 0} declares an int field with default 0, which is correct for forward compatibility.
Final Answer:
{"name": "age", "type": "int", "default": 0} -> Option C
Quick Check:
New optional field with default = {"name": "age", "type": "int", "default": 0} [OK]

Quick Trick: New fields need defaults for forward compatibility [OK]

Common Mistakes:

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