[GitHub] [rocketmq-client-go] yangjian102621 commented on issue #946: Orderly message does not work

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

yangjian102621 commented on issue #946:
URL: https://github.com/apache/rocketmq-client-go/issues/946#issuecomment-1278808542

   I had find the reason. i should have specify a QueueSelector for the producer.
   
   ```go
   type MyQueueSelector struct{}
   
   func (q MyQueueSelector) Select(msg *primitive.Message, mqs []*primitive.MessageQueue) *primitive.MessageQueue {
   	orderId, err := strconv.Atoi(msg.GetShardingKey())
   	if err == nil {
   		return mqs[orderId%len(mqs)]
   	} else {
   		return mqs[0]
   	}
   }
   
   // then create producer with specified queue selector
   p, err := rocketmq.NewProducer(
   		producer.WithNameServer(config.NameSrvAddr),
   		producer.WithGroupName(config.ProducerGroup),
   		producer.WithRetry(2),
   		producer.WithQueueSelector(MyQueueSelector{}),
   	)
   ```
   Then it works.
   
   ```go
   INFO[0063] Receive message: Ordered Message Step -> 0, orderId: 0 
   INFO[0063] Receive message: Ordered Message Step -> 1, orderId: 0 
   INFO[0063] Receive message: Ordered Message Step -> 2, orderId: 0 
   INFO[0063] Receive message: Ordered Message Step -> 3, orderId: 0 
   INFO[0063] Receive message: Ordered Message Step -> 4, orderId: 0 
   INFO[0063] Receive message: Ordered Message Step -> 0, orderId: 1 
   INFO[0063] Receive message: Ordered Message Step -> 1, orderId: 1 
   INFO[0063] Receive message: Ordered Message Step -> 2, orderId: 1 
   INFO[0063] Receive message: Ordered Message Step -> 3, orderId: 1 
   INFO[0063] Receive message: Ordered Message Step -> 4, orderId: 1 
   INFO[0063] Receive message: Ordered Message Step -> 0, orderId: 2 
   INFO[0063] Receive message: Ordered Message Step -> 1, orderId: 2 
   INFO[0063] Receive message: Ordered Message Step -> 2, orderId: 2 
   INFO[0063] Receive message: Ordered Message Step -> 3, orderId: 2 
   INFO[0063] Receive message: Ordered Message Step -> 4, orderId: 2
   ```
   
   And i found it does not had a example for orderly message Producer,  considering add one?


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