When querying metadata for a single topic, don't always autocreate if nonexistant.

[llamahunter]

Versions

Please specify real version numbers or git SHAs, not just "Latest" since that changes fairly regularly.

Sarama	Kafka	Go
v1.26.4	2.4.0	1.12

Configuration

N/A

Logs

N/A

Problem Description

When requesting metadata on a single topic, the sarama library will request the broker to create the topic if it does not exist. This in not always desirable, since the topic might get made with some weird broker defined configuration. Would rather that the topic were not created, and that it was just absent from the locally cached cluster metadata.

Otherwise, this forces people to use the non topic specific metadata request, which refreshes the entire cluster's metadata. If there are thousands of topics, this can be quite a performance hit.

There should be a way to request metadata on a single topic while still suppressing auto topic creation.

[github-actions]

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[dnwe]

This is supported since v1.30 and #1983 by setting the AllowAutoTopicCreation bool in config:

sarama/config.go

Lines 164 to 167 in 6162a43

	// Whether to allow auto-create topics in metadata refresh. If set to true,
	// the broker may auto-create topics that we requested which do not already exist,
	// if it is configured to do so (`auto.create.topics.enable` is true). Defaults to true.
	AllowAutoTopicCreation bool