gokafka-consumer-apisarama

Warp sarama-cluster consuming action in a goroutine, then it fails to consume anything

I'm using sarama-cluster lib to create a kafka group consumer, in a backend service. This example code from godoc works:

for {
    if msg, ok := <-consumer.Messages(); ok {
        fmt.Fprintf(os.Stdout, "%s/%d/%d\t%s\t%s\n", msg.Topic, msg.Partition, msg.Offset, msg.Key, msg.Value)
        consumer.MarkOffset(msg, "") // mark message as processed
    }
}

since it's a dead loop, I put it in a goroutine to avoid blocking other activities, then it can no longer consume any message:

go func() {
    for msg := range consumer.Messages() {
        fmt.Fprintf(os.Stdout, "%s/%d/%d\t%s\t%s\n", msg.Topic, msg.Partition, msg.Offset, msg.Key, msg.Value)
        consumer.MarkOffset(msg, "") // mark message as processed
    }
}()

(service is running, so this goroutine is not terminated. It just fails to consume)

Any idea how to solve this?

Solution

  • sarama-cluster is in unmaintained for quite some time already with the following notice:

    Please note that since https://github.com/Shopify/sarama/pull/1099 was merged and released (>= v1.19.0) this library is officially deprecated. The native implementation supports a variety of use cases that are not available through this library.

    I suggesty you to use github.com/Shopify/sarama instead. It has all the functionalities of sarama-cluster and it's actively maintained.

    You can follow a simple consumer group example from their repository.