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From spring-docs, I can see
MANUAL - the message listener is responsible to acknowledge() the Acknowledgment; after which, the same semantics as BATCH are applied.
MANUAL_IMMEDIATE - commit the offset immediately when the Acknowledgment.acknowledge() method is called by the listener.
But what exactly is the difference if the listener is committing the offset. What additional steps are done for MANUAL mode
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Method Summary Manually assign a list of partition to this consumer. Get the set of partitions currently assigned to this consumer. Close the consumer, waiting indefinitely for any needed cleanup. Commit offsets returned on the last poll() for all the subscribed list of topics and partition.
When a Reactive Messaging Message processing completes, it acknowledges the message. In the case of processing failures, it sends a negative acknowledgment. The Kafka connector receives these acknowledgments and can decide what needs to be done, basically: to commit or not to commit.
public static final ContainerProperties.AckMode MANUAL. Listener is responsible for acking - use a AcknowledgingMessageListener ; acks will be queued and offsets will be committed when all the records returned by the previous poll have been processed by the listener.
The acks setting is a client (producer) configuration. It denotes the number of brokers that must receive the record before we consider the write as successful. It support three values — 0 , 1 , and all .
Although the Serializer and Deserializer API is quite simple and flexible from the low-level Kafka Consumer and Producer perspective, you might need more flexibility at the Spring Messaging level, when using either @KafkaListener or Spring Integration .
Starting with version 1.1.4, Spring for Apache Kafka provides first-class support for Kafka Streams . To use it from a Spring application, the kafka-streams jar must be present on classpath.
To let you easily convert to and from org.springframework.messaging.Message, Spring for Apache Kafka provides a MessageConverter abstraction with the MessagingMessageConverter implementation and its StringJsonMessageConverter and BytesJsonMessageConverter customization.
The KafkaTransactionManager is an implementation of Spring Framework’s PlatformTransactionManager . It is provided with a reference to the producer factory in its constructor. If you provide a custom producer factory, it must support transactions.
MANUAL - acks are queued and the offsets committed in one operation when all the results from the last poll have been processed.
MANUAL_IMMEDIATE - the offset is committed immediately (sync or async) as long as the ack is performed on the listener thread.
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