Matthias J. Sax created KAFKA-7317:
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Summary: 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
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`.
This ticket proposes to use the same feature within Kafka Streams to allow the
usage of collection based subscription in all clients to reduce the metadata
response size than can be very large for large number of partitions in the
cluster.
Also, the new metadata request cannot be used in consumer clients atm. Thus, we
either need an internal config to allow Streams to enable this feature on the
consumer, or we do a KIP and add a public config to enable this feature for all
users.
For the AdminClient that is used during rebalance, Streams should also switch
from wildcard metadata requests to topic-collection requests.
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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