How to Retrieve Consumer Group Offsets in Golang Kafka 10 using Sarama?

Accessing Consumer Group Offsets in Golang Kafka 10

The evolution of the Golang Kafka library (sarama) with Kafka 10 has introduced native consumer group functionality. This poses the question of how to retrieve the current message offset being processed by a consumer group.

Solution:

To address this need, the sarama library provides a mechanism for accessing consumer group offsets. The following code snippet demonstrates how to obtain the offset using GetCGOffset():

<code class="go">import (
    "context"
    "fmt"
    "strings"
    "github.com/Shopify/sarama"
)

func GetCGOffset(ctx context.Context, brokers, groupName, topic string) (int64, error) {
    config := sarama.NewConfig()
    config.Consumer.Offsets.AutoCommit.Enable = false

    client, err := sarama.NewConsumerGroup(strings.Split(brokers, ","), groupName, config)
    if err != nil {
        return 0, err
    }
    defer client.Close()

    info := gcInfo{}
    if err := client.Consume(ctx, []string{topic}, &info); err != nil {
        return 0, err
    }
    return info.offset, nil
}</code>

This code creates a consumer group and connects to the specified brokers. It disables auto-commit to ensure the offset is not updated during the retrieval process. The gcInfo struct tracks the initial offset, which represents the current message offset being processed by the consumer group.

By using this mechanism, developers can easily inspect and manage the offsets of their consumer groups, enabling more granular control over message processing and tracking.

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