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This KIP proposes to deprecate the broker.id server configuration property in Apache Kafka 4.3 and remove it in Apache Kafka 5.0.

Config

Type

Default

4.3

5.0

broker.id

INT

-1

Deprecated

Removed

node.id

INT

(required)

No change

No change

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Notes:

  • The default value of -1 for broker.id is effectively unused in KRaft mode. If node.id is set, the synonym mechanism overwrites broker.id with the value of node.id. If neither is set, node.id validation fails with a ConfigException before the default is ever used.
  • The documentation describes node.id as required in KRaft mode, but it can currently be omitted if broker.id is set, because the synonym mechanism automatically populates node.id from broker.id. After the removal in 5.0, node.id must be explicitly set.

No changes to public APIs, network protocols, metrics, or command-line tools.

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