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AWS SQS - inserting a single message but can only fetch a list?

2

1

I'm using .Net core to access an SQS queue and get a message from that queue.

Everything works fine.

For inserting a message :

 var sendMessageRequest = new SendMessageRequest();
 sendMessageRequest.QueueUrl = queueName;
 sendMessageRequest.MessageBody = message;
 sqs.SendMessage(sendMessageRequest);

Notice that I can only insert a single message :

However when I was looking at the ReceieveMessage method :

 public static void GetMessage(AmazonSQSClient sqs , string queueName )
 {
 var receiveMessageRequest = new ReceiveMessageRequest QueueUrl = queueName ;
 var receiveMessageResponse = sqs.ReceiveMessage(receiveMessageRequest);

I've noticed that I can only get a list :

Question:

I don't understand how come I can insert a single message , but read a list of messages ?

Even if I have many messages in my queue , this code ^ only fetches one message :

Where I have 6 messages :

c# amazon-web-services .net-core amazon-sqs

share|improve this question

asked Mar 6 at 15:22

Royi NamirRoyi Namir

76.1k99333596

add a comment | 

2

1

I'm using .Net core to access an SQS queue and get a message from that queue.

Everything works fine.

For inserting a message :

 var sendMessageRequest = new SendMessageRequest();
 sendMessageRequest.QueueUrl = queueName;
 sendMessageRequest.MessageBody = message;
 sqs.SendMessage(sendMessageRequest);

Notice that I can only insert a single message :

However when I was looking at the ReceieveMessage method :

 public static void GetMessage(AmazonSQSClient sqs , string queueName )
 {
 var receiveMessageRequest = new ReceiveMessageRequest QueueUrl = queueName ;
 var receiveMessageResponse = sqs.ReceiveMessage(receiveMessageRequest);

I've noticed that I can only get a list :

Question:

I don't understand how come I can insert a single message , but read a list of messages ?

Even if I have many messages in my queue , this code ^ only fetches one message :

Where I have 6 messages :

c# amazon-web-services .net-core amazon-sqs

share|improve this question

asked Mar 6 at 15:22

Royi NamirRoyi Namir

76.1k99333596

add a comment | 

I'm using .Net core to access an SQS queue and get a message from that queue.

Everything works fine.

For inserting a message :

 var sendMessageRequest = new SendMessageRequest();
 sendMessageRequest.QueueUrl = queueName;
 sendMessageRequest.MessageBody = message;
 sqs.SendMessage(sendMessageRequest);

Notice that I can only insert a single message :

However when I was looking at the ReceieveMessage method :

 public static void GetMessage(AmazonSQSClient sqs , string queueName )
 {
 var receiveMessageRequest = new ReceiveMessageRequest QueueUrl = queueName ;
 var receiveMessageResponse = sqs.ReceiveMessage(receiveMessageRequest);

I've noticed that I can only get a list :

Question:

I don't understand how come I can insert a single message , but read a list of messages ?

Even if I have many messages in my queue , this code ^ only fetches one message :

Where I have 6 messages :

c# amazon-web-services .net-core amazon-sqs

share|improve this question

asked Mar 6 at 15:22

Royi NamirRoyi Namir

76.1k99333596

 var sendMessageRequest = new SendMessageRequest();
 sendMessageRequest.QueueUrl = queueName;
 sendMessageRequest.MessageBody = message;
 sqs.SendMessage(sendMessageRequest);

 public static void GetMessage(AmazonSQSClient sqs , string queueName )
 {
 var receiveMessageRequest = new ReceiveMessageRequest QueueUrl = queueName ;
 var receiveMessageResponse = sqs.ReceiveMessage(receiveMessageRequest);

share|improve this question

asked Mar 6 at 15:22

Royi NamirRoyi Namir

76.1k99333596

share|improve this question

asked Mar 6 at 15:22

Royi NamirRoyi Namir

76.1k99333596

asked Mar 6 at 15:22

Royi NamirRoyi Namir

76.1k99333596

asked Mar 6 at 15:22

Royi NamirRoyi Namir

76.1k99333596

1 Answer
1

active

oldest

votes

4

If you want to send multiple messages in a single API call, there is SendMessageBatch documented here and here.

If you want to receive only a single message per request, you would set ReceiveMessageRequest.MaxNumberOfMessages to 1.

share|improve this answer

answered Mar 6 at 15:34

Mark BMark B

103k16163177

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks , but How come AWS gives me only 1 message , while I have 5 in queue (while I'm explicitly asking for 5)? i.imgur.com/n3XVtGa.jpg
  
  – Royi Namir
  Mar 6 at 15:36
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can't explicitly ask SQS for 5. You are most likely setting the Max messages to 5, but that doesn't guarantee you will get 5, it just guarantees you will never get more than 5. What are you setting WaitTimeSeconds to? If that is very low it may be affecting how SQS is bundling up messages for you.
  
  – Mark B
  Mar 6 at 15:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Got it. it's AWS that determines how much to fetch up to this max boundry.
  
  – Royi Namir
  Mar 6 at 15:46
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @RoyiNamir yes, but you should always set WaitTimeSeconds to 20 unless you have a specific reason not to. Not setting this at all will increase your chances of getting fewer messages or even 0 messages, and setting it does not cause SQS to actually wait that long unless there really are no messages available -- in which case, it will wait that long and then return 0, or will return the next message to arrive immediately upon its arrival. This dramatically reduces operational costs and improves overall performance and should have been the default behavior.
  
  – Michael - sqlbot
  Mar 7 at 9:05
  

  
  
  
  

add a comment | 

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4

If you want to send multiple messages in a single API call, there is SendMessageBatch documented here and here.

If you want to receive only a single message per request, you would set ReceiveMessageRequest.MaxNumberOfMessages to 1.

share|improve this answer

answered Mar 6 at 15:34

Mark BMark B

103k16163177

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks , but How come AWS gives me only 1 message , while I have 5 in queue (while I'm explicitly asking for 5)? i.imgur.com/n3XVtGa.jpg
  
  – Royi Namir
  Mar 6 at 15:36
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can't explicitly ask SQS for 5. You are most likely setting the Max messages to 5, but that doesn't guarantee you will get 5, it just guarantees you will never get more than 5. What are you setting WaitTimeSeconds to? If that is very low it may be affecting how SQS is bundling up messages for you.
  
  – Mark B
  Mar 6 at 15:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Got it. it's AWS that determines how much to fetch up to this max boundry.
  
  – Royi Namir
  Mar 6 at 15:46
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @RoyiNamir yes, but you should always set WaitTimeSeconds to 20 unless you have a specific reason not to. Not setting this at all will increase your chances of getting fewer messages or even 0 messages, and setting it does not cause SQS to actually wait that long unless there really are no messages available -- in which case, it will wait that long and then return 0, or will return the next message to arrive immediately upon its arrival. This dramatically reduces operational costs and improves overall performance and should have been the default behavior.
  
  – Michael - sqlbot
  Mar 7 at 9:05
  

  
  
  
  

add a comment | 

4

If you want to send multiple messages in a single API call, there is SendMessageBatch documented here and here.

If you want to receive only a single message per request, you would set ReceiveMessageRequest.MaxNumberOfMessages to 1.

share|improve this answer

answered Mar 6 at 15:34

Mark BMark B

103k16163177

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks , but How come AWS gives me only 1 message , while I have 5 in queue (while I'm explicitly asking for 5)? i.imgur.com/n3XVtGa.jpg
  
  – Royi Namir
  Mar 6 at 15:36
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can't explicitly ask SQS for 5. You are most likely setting the Max messages to 5, but that doesn't guarantee you will get 5, it just guarantees you will never get more than 5. What are you setting WaitTimeSeconds to? If that is very low it may be affecting how SQS is bundling up messages for you.
  
  – Mark B
  Mar 6 at 15:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Got it. it's AWS that determines how much to fetch up to this max boundry.
  
  – Royi Namir
  Mar 6 at 15:46
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @RoyiNamir yes, but you should always set WaitTimeSeconds to 20 unless you have a specific reason not to. Not setting this at all will increase your chances of getting fewer messages or even 0 messages, and setting it does not cause SQS to actually wait that long unless there really are no messages available -- in which case, it will wait that long and then return 0, or will return the next message to arrive immediately upon its arrival. This dramatically reduces operational costs and improves overall performance and should have been the default behavior.
  
  – Michael - sqlbot
  Mar 7 at 9:05
  

  
  
  
  

add a comment | 

If you want to send multiple messages in a single API call, there is SendMessageBatch documented here and here.

If you want to receive only a single message per request, you would set ReceiveMessageRequest.MaxNumberOfMessages to 1.

share|improve this answer

answered Mar 6 at 15:34

Mark BMark B

103k16163177

share|improve this answer

answered Mar 6 at 15:34

Mark BMark B

103k16163177

answered Mar 6 at 15:34

Mark BMark B

103k16163177

answered Mar 6 at 15:34

Mark BMark B

103k16163177