A Kafka topic listed in the Kafka() engine's kafka_topic_list parameter. ClickHouse opens a consumer (or kafka_num_consumers parallel consumers) against this topic under the consumer group named in kafka_group_name and decodes each message using the format named in kafka_format.
kafka_topic — Name of the Kafka topic being consumed
Operations
receive
consumeFromKafka
ClickHouse, on behalf of a CREATE TABLE ... ENGINE = Kafka(...) definition, polls the configured topic(s) and decodes each record according to kafka_format. A downstream MATERIALIZED VIEW typically mo
Messages
KafkaRecord
A single Kafka record consumed by the ClickHouse Kafka engine and exposed as a row with virtual columns.
Content-Type: application/octet-stream
About AsyncAPI
The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.
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