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

["Mirza Gaush Beg (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-2359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336331#comment-15336331 ] 

Mirza Gaush Beg edited comment on KAFKA-2359 at 6/17/16 4:41 PM:
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Another use case: 
i want to retrieve data based on an offset range (starting from last committed offset to the last message present at topic partition) using  'KafkaUtils.createRDD' for the same consumer group.id.  I am using  high level consumer API from 0.9.0.1, then following below steps,
 2. Call 'subscribe'
 3. call 'partitionsFor'
4. call 'committed' - gives the last committed offset
5. call 'seekToEnd' - to retrieve the last offset  and this fails with "Caused by: java.lang.IllegalStateException: No current assignment for partition test-topic-0". exception is seen with other two methods 'seek' and 'seekToBeginning' as well.



was (Author: gauss2402):
Another use case: 
i want to retrieve data based on an offset range (starting from last committed offset to the last message present at topic partition) using  'KafkaUtils.createRDD' for the same consumer group.id.  I am using  high level consumer API from 0.9.0.1, then following below steps,
 2. Call 'subscribe'
 3. call 'partitionsFor'
4. call 'committed' - gives the last committed offset
5. call 'seekToEnd' - to retrieve the last offset  and this fails with "Caused by: java.lang.IllegalStateException: No current assignment for partition test-topic-0". exception is seen with other two methods 'seek' and 'seekToBeginning'


> 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: 0.9.0.0
>            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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