Group coordinator in Kafka - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the role of a Group Coordinator in Kafka consumer groups?

The Group Coordinator manages the membership of a consumer group, assigns partitions to consumers, and ensures all consumers work together without overlap.

beginner

How does the Group Coordinator handle new consumers joining a group?

When a new consumer joins, the Group Coordinator triggers a rebalance to assign partitions fairly among all consumers.

intermediate

What happens if the Group Coordinator fails or becomes unreachable?

Kafka automatically elects a new Group Coordinator to maintain group management and continue partition assignments without disruption.

intermediate

Explain the relationship between the Group Coordinator and partition assignment.

The Group Coordinator decides which consumer gets which partitions, balancing load and ensuring each partition is consumed by only one consumer in the group.

beginner

What is a rebalance in Kafka consumer groups and who initiates it?

A rebalance is the process of redistributing partitions among consumers. The Group Coordinator initiates it when consumers join, leave, or fail.

What does the Group Coordinator do in Kafka?

A Produces messages to topics

B Stores messages permanently

C Manages consumer group membership and partition assignments

D Monitors network traffic

The Group Coordinator manages consumer group membership and assigns partitions to consumers.

When does the Group Coordinator trigger a rebalance?

A When the broker restarts

B When a new consumer joins or leaves the group

C When a message is produced

D When a topic is deleted

A rebalance happens when consumers join or leave to redistribute partitions.

What ensures that each partition is consumed by only one consumer in a group?

A Group Coordinator's partition assignment

B Producer configuration

C Broker replication

D Consumer offset commit

The Group Coordinator assigns partitions so each is consumed by only one consumer.

What happens if the Group Coordinator fails?

A All consumers stop working permanently

B Partitions are deleted

C Messages are lost

D Kafka elects a new Group Coordinator

Kafka automatically elects a new Group Coordinator to keep the group running.

Which Kafka component is responsible for managing consumer groups?

A Group Coordinator

B Producer

C Zookeeper

D Topic Controller

The Group Coordinator manages consumer groups and their partition assignments.

Describe the responsibilities of the Group Coordinator in Kafka consumer groups.

Think about how Kafka keeps consumers working together smoothly.

Explain what happens during a rebalance triggered by the Group Coordinator.

Consider how Kafka keeps workload balanced among consumers.