Group.id
group.id is a Kafka consumer configuration property that identifies the consumer group whose partition assignments and consumption progress the consumer participates in.
Kafka Streams in Action, Second Edition
group.id is a Kafka consumer configuration identifying the consumer group to which a consumer belongs.
- How it is used
- Groups consumers into one logical consumer so they can share topic-partition processing.
- How deep it goes
- Explains group membership, exclusive partition assignments, capacity limits, failures, and rebalancing without detailing configuration code.
- Examples
- Uses a six-partition topic shared by three consumers and a polling sales consumer processing ProductTransaction records.
- What you can do after
- Operate/configure consumers to share partitions through a common group ID and anticipate rebalances when membership changes.
Read how Kafka Streams in Action, Second Edition explains group.id →
Apache Kafka in Action
group.id is the Kafka consumer configuration property that identifies the consumer group to which a consumer belongs.
- How it is used
- Identifies which consumers share partition work and offsets while keeping different services’ consumption independent.
- How deep it goes
- Explains membership, partition assignment, offset continuity and the consequences of reusing an ID; stops short of application configuration code.
- Examples
- Uses price-change services, console consumers sharing a group ID, and a consumer-group command reporting partition offsets and lag.
- What you can do after
- Operate/configure a consumer group with `--group`, inspect its offsets and lag, and avoid unintended group ID reuse.
Related concepts
- consumer groupconfigures · A consumer group is a logical set of message consumers that cooperatively processes a shared stream by distributing its partitions among group members.
- offsetuses · An offset is a position or displacement measured relative to a reference point, such as within an ordered sequence, memory region, or layout.
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