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heiko-braun/1_a.md

Created December 4, 2023 10:45
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1_a.md

Keywords: Apache Camel | Kafka Consumer Component | Spring-Boot | Kafka Testcontainer | test message | Kafka component | Camel route

Messages

user: I am using the Kafka Consumer Component with Apache Camel 4.1.0 and Spring-Boot 3.1.5. To test message processing, I use a Kafka Testcontainer (one broker, one partition) and publish one test message per test-case to be processed. Surprisingly, the Camel Kafka consumer always picks up the test message twice, except for the very first test case in a test suite; here is a Camel trace log snippet: To my understanding the Kafka component should automatically commit received messages, so duplicates should be an exception instead of the norm (the above happens reproducibly on every test case except the first one) and a Camel route should run to completion before a new message is polled from Kafka. What am I missing here? What could be an explanation for the observed behavior? Is it possible that the Kafka Consumer component has been started multiple times?

assistant: It seems that the information received from the entity lookup did not provide specific details related to the Kafka Consumer behavior with Apache Camel. Let's focus on addressing the observed behavior of the Kafka Consumer double pickup issue. To do so, we will examine the documentation and common practices for using the Kafka Consumer component with Apache Camel.

The observed behavior of the Kafka Consumer component picking up test messages twice could be attributed to several factors. The following points are worth considering:

  1. Consumer Configuration: The consumer configuration for the Kafka Consumer component needs to be verified to ensure that the consumer is set up correctly. This includes confirming that the auto-commit settings and consumer group configuration are appropriate.

  2. Camel Route Configuration: The Camel route configuration for the Kafka Consumer component should be reviewed to ensure that the message consumption behavior is as expected.

  3. Test Environment: The behavior should be validated in a non-test environment to rule out any specific issues related to the test setup, such as the Kafka Testcontainer or test framework.

Would you like to investigate further into the specific configurations for the Kafka Consumer component and the Camel route to validate the setup and identify potential causes for the observed behavior?

@orpiske
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orpiske commented Dec 4, 2023

Likely ignoring the most obvious cause: incorrect value for autoOffsetReset.

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