Group leader
A group leader is the elected Kafka consumer-group member responsible for calculating the group’s partition assignments.
Apache Kafka in Action
A group leader is the first consumer to join a consumer group and the member responsible for creating its partition distribution plan.
- How it is used
- Coordinates partition distribution within a consumer group by having its first member plan assignments during a rebalance.
- How deep it goes
- Traces leader selection and the assignment handoff through the group coordinator, then explains assignment strategies without detailing leader implementation.
- Examples
- Illustrates Range assignment with two two-partition topics and three consumers, leaving one consumer without partitions.
- What you can do after
- Operate/configure it by keeping partition assignment strategies consistent across group members and interpreting the leader’s role during rebalances.
Kafka Streams in Action, Second Edition
A group leader is the elected Kafka consumer-group member that calculates partition assignments and submits them to the group coordinator.
- How it is used
- Coordinates consumer-group partition assignment when members join, leave, or fail.
- How deep it goes
- Explains the leader’s role within coordinator-driven rebalancing but does not detail its assignment algorithm.
- Examples
- Uses a coordinator-and-leader diagram plus join, failure, and partition-redistribution scenarios.
- What you can do after
- Evaluate how Kafka distributes partitions after consumer-group membership changes.
Read how Kafka Streams in Action, Second Edition explains group leader →
Related concepts
- clientkind of · A client is a person, organization, device, or software component that receives or uses a product, service, resource, or functionality provided by another entity.
- consumer assignment strategyuses · A consumer assignment strategy is the algorithm that distributes Kafka topic partitions among members of a consumer group.
- group coordinatoruses · A group coordinator is the Kafka broker responsible for managing a consumer group’s membership, liveness, partition assignments, and committed offsets.
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