Which is an optional field in an Avro record?

Question

Options

• Adoc
• Bname
• Cnamespace
• Dfields

• A
  92% (44)
• B
  2% (1)
• C
  2% (1)
• D
  4% (2)

Explanation

doc is the correct answer because it is a purely descriptive, human-readable documentation string in an Avro record schema - it has no functional effect and the schema is fully valid without it.

Why the distractors are wrong:

• B (name) is required - every Avro record must have a name to identify the schema type; omitting it causes a schema parse error.
• D (fields) is required - it defines the actual data structure of the record; a record schema without fields is invalid.
• C (namespace) is technically optional in the spec, but the exam distinguishes it from doc because namespace plays a functional role (qualifying the full name to avoid conflicts), whereas doc is purely informational with zero impact on serialization or schema resolution.

Memory tip: Think of doc as a code comment - it helps humans understand the schema but changes nothing about how data is encoded or decoded, making it the one field you can always safely omit.

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