[jira] [Resolved] (KAFKA-986) Topic Consumption Across multiple instances of consumer groups

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

     [ https://issues.apache.org/jira/browse/KAFKA-986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Manikumar resolved KAFKA-986.
-----------------------------
    Resolution: Cannot Reproduce

> Topic Consumption Across multiple instances of consumer groups
> --------------------------------------------------------------
>
>                 Key: KAFKA-986
>                 URL: https://issues.apache.org/jira/browse/KAFKA-986
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions: 0.8.0
>         Environment: Linux
>            Reporter: Subbu Srinivasan
>            Assignee: Neha Narkhede
>
> Folks,
> How can we simulate the notion of queues for consumers from multiple instances?
> For eg: I have a topic log.
> From a single machine ( I tried from different machines also) I started two consumers on same topic with same group id. Both the consumers get copes of messages. 
> bin/kafka-console-consumer.sh --zookeeper kafka1:2181  --topic log --group 1
> bin/kafka-console-consumer.sh --zookeeper kafka1:2181  --topic log --group 1
> From the design section at http://kafka.apache.org/design.html
> <clipped from there>
> Each consumer process belongs to a consumer group and each message is delivered to exactly one process within every consumer group. Hence a consumer group allows many processes or machines to logically act as a single consumer. The concept of consumer group is very powerful and can be used to support the semantics of either a queue or topic as found in JMS. To support queue semantics, we can put all consumers in a single consumer group, in which case each message will go to a single consumer. 
> </clipped from there>
> Can someone elaborate on this?
> Thanks



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