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Discover practical solutions for sending large messages through MongoDB Kafka Connect and overcome configuration challenges.
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How to Resolve the MongoDB Kafka Connect Large Message Issue

Are you having trouble sending large messages (over 1 MB) from MongoDB using Kafka Connect? If you've managed to send smaller pieces of data but are met with frustrating errors when dealing with large JSON objects, you're not alone. This guide tackles the common issue where Kafka Connect throws an error for messages exceeding the set size limits, specifically when utilizing MongoDB as a source. Let’s explore the problem and the steps you can take toward a solution.

Understanding the Problem

When you try to send larger JSON data from MongoDB to Kafka using Kafka Connect, you might encounter an error similar to the following:

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This error message indicates that the message size you are trying to send exceeds the max.request.size limit set in your Kafka configuration, which defaults to 1 MB (1048576 bytes).

Why Does This Happen?

Kafka has built-in limits to prevent overwhelming the system with excessively large messages. If your messages regularly exceed the limit, it’s essential to adjust your configuration settings. In your case, you attempted to configure the topic related to the large messages but still encountered issues. Here’s what you need to consider to solve the problem effectively:

Steps to Solve the Large Message Issue

1. Configure Kafka Broker Settings

You must update the broker configuration to allow larger messages. This can be accomplished by modifying the server.properties file on your Kafka broker. Change the following property:

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2. Update Producer Settings

You should also adjust the producer's settings through the configuration file or dynamically through the command line. Set the max.request.size property like so:

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3. Configure Topic Settings

If you already modified your topic configurations, ensure they reflect the changes. You mentioned a dynamic configuration; use the following command to confirm your settings or adjust them as needed:

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4. Check Consumer Configuration

Finally, ensure that your consumer settings can accommodate larger messages as well. Update the max.partition.fetch.bytes property in the consumer configuration if necessary:

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Conclusion

By following these steps, you should effectively eliminate the issue of sending large messages via MongoDB Kafka Connect. Adjusting the broker, producer, topic, and consumer settings to handle larger message sizes is crucial for proper data flow between MongoDB and Kafka. If issues persist even after these adjustments, consider reviewing the batch size and timeout settings, as these can also play a role in message handling.

With the guidance provided, you should now be equipped to tackle any large message challenges you face. Happy coding!