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https://issues.apache.org/jira/browse/KAFKA-2350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-2350.
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Resolution: Fixed
Fix Version/s: 0.9.0
Issue resolved by pull request 100
[https://github.com/apache/kafka/pull/100]
> Add KafkaConsumer pause capability
> ----------------------------------
>
> Key: KAFKA-2350
> URL: https://issues.apache.org/jira/browse/KAFKA-2350
> Project: Kafka
> Issue Type: Improvement
> Components: consumer
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Fix For: 0.9.0
>
>
> 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 calls to poll() or if you unsubscribe, then
> a rebalance will be triggered and your partitions will be reassigned to
> another consumer. The desired behavior is instead that you keep the partition
> assigned and simply
> One way to achieve this would be to add two new methods to KafkaConsumer:
> {code}
> void pause(TopicPartition... partitions);
> void resume(TopicPartition... partitions);
> {code}
> Here is the expected behavior of pause/resume:
> * When a partition is paused, calls to KafkaConsumer.poll will not initiate
> any new fetches for that partition.
> * After the partition is resumed, fetches will begin again.
> * While a partition is paused, seek() and position() can still be used to
> advance or query the current position.
> * Rebalance does not preserve pause/resume state.
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