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"Our first finding was that requirements 2 and 3 are satisfied by a feature called Message Groups. What came as a surprise...ActiveMQ and RabbitMQ, do not support this feature"

A quick search seems to indicate that ActiveMQ does support message groups: http://activemq.apache.org/message-groups.html

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Actually this is right, so the information in the article is somewhat incorrect. Thanks for spotting this! There is however an issue with the ActiveMQ implementation: once a user is assigned to a consumer, it is hard to make ActiveMQ rebalance it. At least by default the load-balancing does not take place until a consumer is dead. In case of a chat bot, some users may be returning, while others may quickly go away, leading to drastic imbalances. Apollo does the balancing perfectly out-of-the-box.

Sounded like a perfect fit for Kafka.

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