Kafka Maven Mysteries

Question

What is the difference between the two dependencies listed below? Do I really need the first to make an application for consumers or producers?

<dependencies>
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka_2.9.2</artifactId>
        <version>0.8.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka-clients</artifactId>
        <version>0.8.2.1</version>
    </dependency>
</dependencies>

My producer works great with the first, but the consumer needs the second.

I thought that the kafka-clients artifact would work for both the manufacturer and the consumer. But it looks like "kafka.consumer.Consumer" comes from another dependency. Why is there a difference?

Also, why is the first artifact called kafka_2.9.2? So why is the version identifier in the name?

Answer 1

API- , Maven :

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>0.9.0.0</version>
</dependency>

. API.