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https://issues.apache.org/jira/browse/KAFKA-986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13721061#comment-13721061
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Subbu Srinivasan commented on KAFKA-986:
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Folks,
Can anyone comment on this?
> 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
> 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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