Fetch request
A fetch request is a Kafka protocol request that asks a broker to return records from a topic partition beginning at a specified offset.
Kafka Streams in Action, Second Edition
A fetch request is a Kafka client request that asks a broker to return records from a topic partition starting at a specified offset.
- How it is used
- Uses consumer-to-broker requests to read retained records from topic partitions in event-streaming applications.
- How deep it goes
- Explains request inputs, broker queueing, batch retrieval, responses, retention effects, and polling cache behavior without protocol internals.
- Examples
- Demonstrates broker diagrams and a Java sales consumer that subscribes, polls, and logs transaction values.
- What you can do after
- Operate a KafkaConsumer that retrieves and processes topic records through subscription and polling.
Read how Kafka Streams in Action, Second Edition explains fetch request →
Apache Kafka in Action
A fetch request is a Kafka protocol request for retrieving records from a partition.
- How it is used
- Retrieves partition records for consumers and synchronizes follower replicas with their leaders.
- How deep it goes
- Traces offsets, queues, I/O, page cache, request purgatory, response timing, and replication, without detailing protocol fields.
- Examples
- Demonstrates kafka-console-consumer.sh reading products.prices.changelog from partition 0 and offset 0, plus follower replication.
- What you can do after
- Apply it via Kafka consumers by choosing starting offsets and tuning fetch.min.bytes and fetch.max.wait.ms for performance.
Related concepts
- offsetuses · An offset is a position or displacement measured relative to a reference point, such as within an ordered sequence, memory region, or layout.
- sink nodeused by · A sink node is a terminal or receiving component in a data or flow system that accepts incoming data, messages, or flow for consumption, processing, or storage.
- clientused by · A client is a person, organization, device, or software component that receives or uses a product, service, resource, or functionality provided by another entity.
- fetch.min.bytesconfigured by · fetch.min.bytes is a Kafka consumer configuration specifying the minimum amount of data a broker should accumulate before responding to a fetch request.
- Kafka brokeruses · A Kafka broker is a server process in an Apache Kafka cluster that stores records and handles producer, consumer, and other client requests.
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