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https://issues.apache.org/jira/browse/KAFKA-2359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ray Chiang updated KAFKA-2359:
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Component/s: consumer
> New consumer - partitions auto assigned only on poll
> ----------------------------------------------------
>
> Key: KAFKA-2359
> URL: https://issues.apache.org/jira/browse/KAFKA-2359
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 0.9.0.0
> Reporter: Stevo Slavic
> Priority: Minor
>
> In the new consumer I encountered unexpected behavior. After constructing
> {{KafkaConsumer}} instance with configured consumer rebalance callback
> handler, and subscribing to a topic with "consumer.subscribe(topic)",
> retrieving subscriptions would return empty set and callback handler would
> not get called (no partitions ever assigned or revoked), no matter how long
> instance was up.
> Then I found by inspecting {{KafkaConsumer}} code that partition assignment
> will only be triggered on first {{poll}}, since {{pollOnce}} has:
> {noformat}
> // ensure we have partitions assigned if we expect to
> if (subscriptions.partitionsAutoAssigned())
> coordinator.ensurePartitionAssignment();
> {noformat}
> I'm proposing to fix this by including same {{ensurePartitionAssignment}}
> fragment in {{KafkaConsumer.subscriptions}} accessor as well.
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