[jira] [Created] (KAFKA-2359) New consumer - partitions auto assigned only on poll

["Stevo Slavic (JIRA)" <ji...@apache.org>]

Stevo Slavic created KAFKA-2359:
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             Summary: 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
    Affects Versions: 0.8.3
            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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