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https://issues.apache.org/jira/browse/KAFKA-7317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17023198#comment-17023198
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ASF GitHub Bot commented on KAFKA-7317:
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bbejeck commented on pull request #7969: KAFKA-7317: Use collections
subscription for main consumer to reduce metadata
URL: https://github.com/apache/kafka/pull/7969
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> Use collections subscription for main consumer to reduce metadata
> -----------------------------------------------------------------
>
> Key: KAFKA-7317
> URL: https://issues.apache.org/jira/browse/KAFKA-7317
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Matthias J. Sax
> Assignee: Sophie Blee-Goldman
> Priority: Major
>
> In KAFKA-4633 we switched from "collection subscription" to "pattern
> subscription" for `Consumer#subscribe()` to avoid triggering auto topic
> creating on the broker. In KAFKA-5291, the metadata request was extended to
> overwrite the broker config within the request itself. However, this feature
> is only used in `KafkaAdminClient`. KAFKA-7320 adds this feature for the
> consumer client, too.
> This ticket proposes to use the new feature within Kafka Streams to allow the
> usage of collection based subscription in consumer and admit clients to
> reduce the metadata response size than can be very large for large number of
> partitions in the cluster.
> Note, that Streams need to be able to distinguish if it connects to older
> brokers that do not support the new metadata request and still use pattern
> subscription for this case.
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