Apache Kafka is a distributed event streaming platform used by thousands of companies for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications. Kafka is designed to handle real-time data feeds, providing a unified, high-throughput, low-latency platform for handling data streams.
When working with Kafka, you might encounter the InvalidRequiredAcksException. This exception typically arises when there is an issue with the acknowledgment settings in your Kafka producer configuration. The symptom is usually observed as an error message indicating that the required acks setting is invalid.
The acks parameter in Kafka producer configuration controls the number of acknowledgments the producer requires the leader to have received before considering a request complete. It is a crucial setting for ensuring message durability and consistency.
The InvalidRequiredAcksException is thrown when the acks setting in the producer configuration is not set to a valid value. Valid values for acks are:
0: No acknowledgment is required.1: The leader writes the record to its local log and responds without waiting for full acknowledgment from all followers.-1 or all: The leader waits for the full set of in-sync replicas to acknowledge the record.Setting the acks to any other value will result in the InvalidRequiredAcksException.
To resolve the InvalidRequiredAcksException, follow these steps:
Check your producer configuration file or code to ensure that the acks parameter is set correctly. Here is an example of how to set it in Java:
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("acks", "1"); // Set to 0, 1, or -1
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
If the acks setting is incorrect, update it to one of the valid values (0, 1, or -1). For example, if you want to ensure message durability, you might set it to -1:
props.put("acks", "-1");
After updating the configuration, restart your Kafka producer to apply the changes. This ensures that the new settings are in effect.
For more information on Kafka producer configurations, you can refer to the official Kafka Documentation. Additionally, for a deeper understanding of Kafka's acknowledgment mechanism, check out the Confluent Blog.
By following these steps, you should be able to resolve the InvalidRequiredAcksException and ensure your Kafka producer is configured correctly for reliable message delivery.
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