[KAFKA-13986] DescribeQuorum does not return the observers (brokers) for the Metadata log

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0, 3.0.1
• Fix Version/s: 3.3.0
• Component/s: kraft
• Assignee: Niket Goel
• Reporter: Niket Goel
• Created: 13/Jun/22 21:17
• Updated: 11/Aug/22 21:23
• Resolved: 11/Aug/22 21:23

Description

Background

While working on the PR for KIP-836, we realized that the `DescribeQuorum` API does not return the brokers as observers for the metadata log.

As noted by dengziming :
We set nodeId=-1 if it's a broker so observers.size==0

The related code is:

https://github.com/apache/kafka/blob/4c9eeef5b2dff9a4f0977fbc5ac7eaaf930d0d0e/core/src/main/scala/kafka/raft/RaftManager.scala#L185-L189

val nodeId = if (config.processRoles.contains(ControllerRole))
{ OptionalInt.of(config.nodeId) }
else
{ OptionalInt.empty() }

ToDo

We should fix this and have the DescribeMetadata API return the brokers as observers for the metadata log.

Issue Links

• links to: GitHub Pull Request #12498