Barry - i believe the error refers to the consumer group "protocol" that is used to decide which partitions get assigned to which consumers. The way it works is that each consumer says it wants to join X group and it can support protocols (1, 2, 3...). The broker looks at all consumers in group X and picks a protocol that all can support. If there is no common protocol you would see this error. Example protocols are 'roundrobin' and 'range' .
You should check the configuration of the group protocol for each consumer and also check that you don't have extra consumers in the group, perhaps because the group id is reused / common. Hope this helps, -Dana On Jun 10, 2016 4:24 AM, "Barry Kaplan" <bkap...@memelet.com> wrote: I delete the group using kafka-consumer-groups.sh --delete and still I get the error.
