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Jason Gustafson commented on KAFKA-2350: ---------------------------------------- Hey [~becket_qin], thanks for the suggestion. I think my only concern is that this would make the API more confusing. It would give two meanings to subscribe(partition) which depend on whether automatic assignment is used. I agree with you about minimizing the complexity of the consumer API, but I'd probably rather have the explicit methods if we think the use case is valid. > Add KafkaConsumer pause capability > ---------------------------------- > > Key: KAFKA-2350 > URL: https://issues.apache.org/jira/browse/KAFKA-2350 > Project: Kafka > Issue Type: Improvement > Reporter: Jason Gustafson > Assignee: Jason Gustafson > > There are some use cases in stream processing where it is helpful to be able > to pause consumption of a topic. For example, when joining two topics, you > may need to delay processing of one topic while you wait for the consumer of > the other topic to catch up. The new consumer currently doesn't provide a > nice way to do this. If you skip poll() or if you unsubscribe, then a > rebalance will be triggered and your partitions will be reassigned. > One way to achieve this would be to add two new methods to KafkaConsumer: > {code} > void pause(String... topics); > void unpause(String... topics); > {code} > When a topic is paused, a call to KafkaConsumer.poll will not initiate any > new fetches for that topic. After it is unpaused, fetches will begin again. -- This message was sent by Atlassian JIRA (v6.3.4#6332)