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These issues lead to inefficient partition management and potential delays in rebalancing, affecting the overall system performance and reliability. Therefore, it is crucial to address this behavior to ensure timely and accurate group membership management and partition rebalancing. By addressing the non-idempotency of the initial heartbeat, this KIP aims to resolve these issues, ensuring more accurate group membership management and timely partition rebalancing.

Last but not least, initially in KIP-848, we rejected the idea of allowing the client to generate its own Member ID due to concerns about additional dependencies and potential issues with correct ID generation. However, since then, improvements in libraries like librdkafka  have addressed these concerns. Given these changes, we now propose requiring client-side Member ID generation, as it simplifies the process and improves reliability.

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