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https://issues.apache.org/jira/browse/KAFKA-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16947659#comment-16947659
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David Arthur commented on KAFKA-8998:
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I'm not sure this is even incompatible since {{Collection<Node>}} is less
specific than {{List<Node>}}. In
[MetadataTest|https://github.com/apache/kafka/blob/2.3.1-rc1/clients/src/test/java/org/apache/kafka/clients/MetadataTest.java#L57]
we still call it with a List.
> Release Candidate Version 2.3.1-rc1 breaks backward compatibility in PATCH
> version
> ----------------------------------------------------------------------------------
>
> Key: KAFKA-8998
> URL: https://issues.apache.org/jira/browse/KAFKA-8998
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 2.3.1
> Reporter: Juan Pablo Correa
> Priority: Major
>
> The expected type for the `preparedResponse` method in the `MetadataResponse`
> ([https://github.com/apache/kafka/blob/2.3.1-rc1/clients/src/main/java/org/apache/kafka/common/requests/MetadataResponse.java#L466])
> has changed from a `List<Node>` to a `Collection<Node>` from the version
> 2.3.0 to 2.3.1, this breaks the backward compatibility that one would expect
> from a PATCH version.
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