[GitHub] [pulsar] archfish commented on issue #6535: [BUG]Msg duplicate when consumer in Failover mode

[GitBox <gi...@apache.org>]

archfish commented on issue #6535: [BUG]Msg duplicate when consumer in Failover mode
URL: https://github.com/apache/pulsar/issues/6535#issuecomment-598612987
 
 
   ```golang
   package main
   
   import (
   	"context"
   	"fmt"
   	"log"
   	"time"
   
   	"github.com/apache/pulsar-client-go/pulsar"
   )
   
   func main() {
   	client, err := pulsar.NewClient(pulsar.ClientOptions{URL: "pulsar://my.pulsar.lan:6650"})
   	if err != nil {
   		log.Fatal(err)
   	}
   
   	defer client.Close()
   
   	consumer, err := client.Subscribe(pulsar.ConsumerOptions{
   		Topic:            "shared",
   		SubscriptionName: "my-sub",
   		Type:             pulsar.Failover,
   	})
   	if err != nil {
   		log.Fatal(err)
   	}
   	defer consumer.Close()
   
   	for i := 0; i < 10; i++ {
   		msg, err := consumer.Receive(context.Background())
   		if err != nil {
   			log.Fatal(err)
   		}
   
   		fmt.Printf("Received message msgId: %#v -- content: '%s'\n",
   			msg.ID(), string(msg.Payload()))
   
   		// consumer.Ack(msg)
   		time.Sleep(10 * time.Second)
   	}
   
   	if err := consumer.Unsubscribe(); err != nil {
   		log.Fatal(err)
   	}
   }
   ```
   
   ```shell
   # at least has one message in topic
   go run examples/consumer/consumer.go
   # after consumer started
   go run examples/consumer/consumer.go
   ```

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