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Title: Troubleshooting Kafka Producer Callbacks: Dealing with message.offset() returning 0 in confluent-python
Apache Kafka is a distributed streaming platform that allows the building of real-time data pipelines and streaming applications. The confluent-python library provides a Python interface to interact with Kafka. In this tutorial, we will explore a common issue encountered with Kafka producers using the send() callback in confluent-python when the message.offset() returns 0.
When using the Kafka producer's send() method with a callback to handle delivery reports, you may encounter a situation where the message.offset() in the callback function always returns 0, even though the message was successfully produced. This discrepancy can be confusing, as the offset should represent the position of the message in the Kafka topic partition.
This issue is often caused by the producer's max_in_flight_requests_per_connection configuration. When set to 1, the producer will wait for an acknowledgment (ACK) from the broker before sending the next message. This can result in the offset being reported as 0 in the callback since the acknowledgment hasn't been received when the callback is invoked.
To address this issue, you can adjust the max_in_flight_requests_per_connection configuration to allow multiple in-flight requests before waiting for acknowledgments.
Adjust the max_in_flight_requests_per_connection value according to your requirements. Setting it to a value greater than 1 allows the producer to send multiple messages without waiting for acknowledgments, which should resolve the issue of message.offset() returning 0 in the callback.
By understanding the impact of the max_in_flight_requests_per_connection configuration on the Kafka producer's callback, you can ensure that the reported offset accurately reflects the position of the produced message in the topic partition. Adjusting this configuration appropriately will help avoid confusion and ensure a smooth interaction with Kafka in your Python applications.
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