Jason Gustafson created KAFKA-2350:
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Summary: 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... partitions);
void unpause(String... partitions);
{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.
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