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The GroupCoordinator in the broker receives a group member’s session timeout upon the JoinGroupRequest and stores this with the rest of the group member's metadata. This means that to dynamically configure a consumer’s session timeout, the consumer must send a JoinGroupRequest. Currently, this could trigger an expensive rebalance operation when members are stable. To get around this, JoinGroup behavior will be changed in the broker so that the session timeout can be updated using JoinGroup without triggering a rebalance in stable group members. The Java consumer's initial DescribeClientConfigsRequest will still be done synchronously before the first JoinGroupRequest to avoid sending an unnecessary JoinGroupRequest.

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