Partition assignment in Kafka - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is partition assignment in Kafka?

Partition assignment is the process where Kafka assigns partitions of a topic to different consumer instances in a consumer group to balance load and ensure each partition is consumed by only one consumer at a time.

beginner

Name two common partition assignment strategies in Kafka.

Two common strategies are:<br>1. Range Assignor - assigns consecutive partitions to consumers.<br>2. RoundRobin Assignor - assigns partitions evenly in a round-robin fashion across consumers.

intermediate

What happens when a new consumer joins a Kafka consumer group regarding partition assignment?

Kafka triggers a rebalance where partitions are reassigned among all consumers so the load is balanced, and each partition is assigned to only one consumer.

intermediate

Explain the role of the ConsumerCoordinator in partition assignment.

The ConsumerCoordinator manages group membership and triggers partition assignment by communicating with the Kafka broker's group coordinator to assign partitions to consumers.

beginner

Why is it important that each partition is assigned to only one consumer in a group?

To avoid duplicate processing and ensure message order within a partition, Kafka guarantees that only one consumer reads from a partition at a time.

What does Kafka do when a consumer leaves a consumer group?

A It triggers a rebalance to reassign partitions.

B It deletes the topic.

C It pauses all consumers.

D It duplicates partitions.

When a consumer leaves, Kafka triggers a rebalance to redistribute partitions among remaining consumers.

Which partition assignment strategy assigns consecutive partitions to consumers?

A RoundRobin Assignor

B Random Assignor

C Sticky Assignor

D Range Assignor

Range Assignor assigns consecutive partitions to each consumer.

In Kafka, can two consumers in the same group consume the same partition simultaneously?

A No, only one consumer per partition.

B Yes, always.

C Only if configured manually.

D Only for compacted topics.

Kafka ensures only one consumer in a group reads from a partition at a time to maintain order and avoid duplicates.

What triggers a partition reassignment in Kafka consumer groups?

A Broker restart

B Topic creation

C Consumer group rebalance

D Message production

Partition reassignment happens during consumer group rebalances triggered by membership changes.

Which Kafka component coordinates partition assignment among consumers?

A Producer

B ConsumerCoordinator

C Zookeeper

D Broker Leader

The ConsumerCoordinator manages group membership and partition assignment.

Describe how Kafka assigns partitions to consumers in a consumer group and why this is important.

Think about how Kafka keeps work divided fairly and orderly among consumers.

Explain what happens during a rebalance in Kafka consumer groups and what triggers it.

Consider what changes when consumers come or go.