aws fifo queue cannot receive messageGroupID

Question

I want to distinguish the messages after retreiving from aws fifo sqs for routing to correct processor. And I planned to utilize the MessageGroupId , which I set while sending the request. I am using Java sdk. sendMessageRequest.setMessageGroupId(messageGroupId);

Documentation says it can be retrieved as request parameter of AttributeName

MessageGroupId - Returns the value provided by the sender that calls the SendMessage action. Messages with the same MessageGroupId are returned in sequence. However, I could not find the correct way/method to do so. There is no attribute MessageGroupId present and size is 0.

List<Message> messages = sqs.receiveMessage(receiveMessageRequest).getMessages();

for (Message message : messages) 
{  
System.out.println("    Size getAttributes:          " +   message.getAttributes() .size());
}

Only if I set any attribute explicitly then it is retreivable (like with MESSAGEPRIORITY), but how to receive the values of attributes like MessageGroupId?

Help is appreciated.

works with message.getAttributes() after receiveMessageRequest.withAttributeNames("All"), as suggested in below reply. — Surbhi, Mar 19 '17 at 15:44

score 3 · Accepted Answer · answered Mar 18 '17 at 23:36

3

You have to tell SQS which attributes you want it to give you, before getAttributes() will be able to show them to you.

List<Message> messages = sqs.receiveMessage(receiveMessageRequest.withAttributeNames("All")).getMessages();

Note that SQS messages have two different kinds of attributes. Attributes are system-generated (like MessageGroupId), while Message Attributes are user-generated, custom key/value pairs included when the message is sent but transported external to the message body itself.

answered Mar 18 '17 at 23:36

Michael - sqlbot

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Thanks much @Michael. Works. – Surbhi Mar 19 '17 at 15:41
@snijhi great! Don't forget to tick the checkmark to signify that the answer has been "accepted." – Michael - sqlbot Mar 19 '17 at 17:35

aws fifo queue cannot receive messageGroupID

1 Answers1