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[release-1.12] Document how to set Kafka Topic config options #5860

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Mar 19, 2024
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[release-1.12] Document how to set Kafka Topic config options #5860

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51e8f33
doc: documented how to set topic config
Cali0707 Feb 7, 2024
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doc: add link to allowed kafka topic config options
Cali0707 Feb 8, 2024
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20 changes: 20 additions & 0 deletions docs/eventing/brokers/broker-types/kafka-broker/README.md
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Expand Up @@ -113,6 +113,26 @@ different `name` on your Kafka Broker's `spec.config` field.
!!! note
The `default.topic.replication.factor` value must be less than or equal to the number of Kafka broker instances in your cluster. For example, if you only have one Kafka broker, the `default.topic.replication.factor` value should not be more than `1`.

Knative supports the [full set of topic config options that your version of Kafka supports](https://kafka.apache.org/documentation/#topicconfigs). To set any of these, you need to add a key to the configmap with the `default.topic.config.` prefix.
For example, to set the `retention.ms` value you would modify the `ConfigMap` to look like the following:

```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: kafka-broker-config
namespace: knative-eventing
data:
# Number of topic partitions
default.topic.partitions: "10"
# Replication factor of topic messages.
default.topic.replication.factor: "3"
# A comma separated list of bootstrap servers. (It can be in or out the k8s cluster)
bootstrap.servers: "my-cluster-kafka-bootstrap.kafka:9092"
# Here is our retention.ms config
default.topic.config.retention.ms: "3600"
```

## Set as default broker implementation

To set the Kafka broker as the default implementation for all brokers in the Knative deployment,
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