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When many producers where used in 0.8 during the beta period an issue was found https://issues.apache.org/jira/browse/KAFKA-1017 which changed how partitions got message messages when the partition key was null (default value). If you are in development/testing and and want to mimic in your development/testing multiple partitions/consumers getting your messages then what you could do is for the partition key have it be UUID.randomUUID().toString. If you are in production then with a sufficient amount of producers the net net will have all consumers getting messages... if If not then you may have to make the partition key help you do this then too and not rely on a null partition key. For more detail see this thread http://mail-archives.apache.org/mod_mbox/kafka-dev/201310.mbox/%3CCAFbh0Q0aVh%2Bvqxfy7H-%2BMnRFBt6BnyoZk1LWBoMspwSmTqUKMg%40mail.gmail.com%3E

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