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• UnknownTopicOrPartitionException: For this case, the producer handles this exception internally and only issues a WARN log about missing metadata and retries internally. Later, when the producer hits the "deliverdelivery.timeout.ms", it throws a TimeoutException and the user can only blindly retry, resulting in an infinite retry loop. The thrown TimeoutException "cuts" the connection to the underlying root cause of missing metadata (which could indeed be a transient error but is persistent for a non-existing topic). Thus, there is no programmatic way to break the infinite retry loop. Kafka Streams also blindly retries for this case, and the application gets stuck.
  

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