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Advanced Spring Boot 4: Event-Driven Architecture (Kafka) · Lesson

Rebalance Listeners and Static Membership

Learn how consumer group rebalances disrupt processing and how rebalance listeners plus static membership minimize downtime and state loss.

What Triggers a Rebalance

A rebalance reassigns partitions among consumers in a group. It happens when a consumer joins, leaves, crashes, or its session times out.

During a rebalance, processing pauses across the group.

The Cost of Rebalancing

Frequent rebalances hurt throughput: partitions are revoked and reassigned, in-flight work may be reprocessed, and local caches are invalidated.

Advanced consumers actively minimize and react to rebalances.

All lessons in this course

  1. Manual Offset Committing
  2. Pausing and Resuming Consumers
  3. Concurrency and Thread Management
  4. Rebalance Listeners and Static Membership
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