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https://issues.apache.org/jira/browse/KAFKA-2686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-2686.
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Resolution: Fixed
Fix Version/s: 0.9.0.0
Issue resolved by pull request 352
[https://github.com/apache/kafka/pull/352]
> unsubscribe() call leaves KafkaConsumer in invalid state for manual
> topic-partition assignment
> ----------------------------------------------------------------------------------------------
>
> Key: KAFKA-2686
> URL: https://issues.apache.org/jira/browse/KAFKA-2686
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 0.9.0.0
> Reporter: The Data Lorax
> Assignee: Guozhang Wang
> Fix For: 0.9.0.0
>
>
> The bellow code snippet demonstrated the problem.
> Basically, the unsubscribe() call leaves the KafkaConsumer in a state that
> means poll() will always return empty record sets, even if new
> topic-partitions have been assigned that have messages pending. This is
> because unsubscribe() sets SubscriptionState.needsPartitionAssignment to
> true, and assign() does not clear this flag. The only thing that clears this
> flag is when the consumer handles the response from a JoinGroup request.
> {code}
> final KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
> consumer.assign(Collections.singletonList(new TopicPartition(topicName, 1)));
> ConsumerRecords<String, String> records = consumer.poll(100);// <- Works,
> returning records
> consumer.unsubscribe(); // Puts consumer into invalid state.
> consumer.assign(Collections.singletonList(new TopicPartition(topicName, 2)));
> records = consumer.poll(100);// <- Always returns empty record set.
> {code}
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