[jira] [Resolved] (KAFKA-2662) Make ConsumerIterator thread-safe for multiple threads in different Kafka groups

["Ismael Juma (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-2662?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ismael Juma resolved KAFKA-2662.
--------------------------------
    Resolution: Auto Closed

The Scala consumers are no longer supported. Please upgrade to the Java consumer whenever possible.

> Make ConsumerIterator thread-safe for multiple threads in different Kafka groups
> --------------------------------------------------------------------------------
>
>                 Key: KAFKA-2662
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2662
>             Project: Kafka
>          Issue Type: Improvement
>          Components: consumer
>    Affects Versions: 0.8.2.1
>            Reporter: Andrew Pennebaker
>            Assignee: Neha Narkhede
>
> The API for obtaining a ConsumerIterator requires a group parameter, implying that ConsumerIterators are thread-safe, as long as each thread is in a different Kafka group. However, in practice, attempting to call hasNext() on ConsumerIterators for a thread in one group, and for a thread in another group, results in an InvalidStateException.
> In the future, can we please make ConsumerIterator thread-safe, for a common use case of one consumer thread per group?



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