批量消费与确认模式
学习批量消费 Kafka 记录，并选择合适的确认模式，在吞吐量、延迟和交付保证之间取得平衡。
批量消费与确认模式 是 CoddyKit 上的免费 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 课时。 这是第 4 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Why Batch Consumption
By default a @KafkaListener processes one record at a time. For high-throughput pipelines, processing records in batches reduces overhead and lets you bulk-write to databases.
Enabling Batch Mode
Set batch-listener to true on the container factory, or configure it in properties.
spring:
kafka:
listener:
type: batchA Batch Listener Method
When batch mode is on, your listener accepts a List of payloads instead of a single value.
@KafkaListener(topics = "orders")
public void handle(List<Order> orders) {
log.info("Received batch of {}", orders.size());
orderRepository.saveAll(orders);
}Accessing Batch Metadata
You can also receive the full list of ConsumerRecord objects to read keys, partitions, and offsets per record.
@KafkaListener(topics = "orders")
public void handle(List<ConsumerRecord<String,Order>> records) {
for (var r : records) {
process(r.value(), r.partition(), r.offset());
}
}Controlling Batch Size
The batch size is bounded by max.poll.records. Tune it to control how many records each poll fetches.
spring:
kafka:
consumer:
max-poll-records: 500Acknowledgment Modes Overview
Spring Kafka offers several AckMode values:
BATCH— commit offsets after the whole batch.RECORD— commit after each record.MANUAL/MANUAL_IMMEDIATE— you call ack explicitly.
Setting AckMode
Configure the ack mode on the listener container factory.
factory.getContainerProperties()
.setAckMode(ContainerProperties.AckMode.BATCH);Manual Acknowledgment in Batches
With MANUAL mode, inject an Acknowledgment and call acknowledge() only after successful processing of the batch.
@KafkaListener(topics = "orders")
public void handle(List<Order> orders, Acknowledgment ack) {
orderRepository.saveAll(orders);
ack.acknowledge();
}Delivery Guarantees
Acknowledging after processing gives at-least-once delivery: if the app crashes mid-batch, the batch is redelivered.
Make your batch processing idempotent so reprocessing is safe.
Throughput vs Latency
Larger batches improve throughput but increase per-message latency and memory use. Start with a moderate max.poll.records and measure.
Putting It Together
Batch consumption plus the right ack mode lets you build efficient, reliable consumers. Combine type: batch, a tuned poll size, manual ack, and idempotent writes.
Quick Check
Test your understanding of batch consumption.
Recap
You learned batch consumption and acknowledgment modes.
- Set
type: batchto receive a List of records. - Tune
max.poll.recordsfor batch size. - Choose an
AckModeto control offset commits. - Acknowledge after processing and keep writes idempotent.
常见问题解答
「批量消费与确认模式」课时是免费的吗？
是的 — 「批量消费与确认模式」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 课程的其余内容，请升级到 CoddyKit PRO。 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 课程共包含 4 节课。
「批量消费与确认模式」这节课中我会学到什么？
学习批量消费 Kafka 记录，并选择合适的确认模式，在吞吐量、延迟和交付保证之间取得平衡。 你通过在浏览器中直接运行的动手代码来练习 Advanced Spring Boot 4: Event-Driven Architecture (Kafka)，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 4 节课，共 4 节。
「批量消费与确认模式」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 课中编写并运行代码吗？
能。每节 Advanced Spring Boot 4: Event-Driven Architecture (Kafka) 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。
此课程中的所有课时
- 构建 Kafka 监听器容器
- 消费者组管理
- 反序列化与消息转换
- 批量消费与确认模式