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Amazon Simple Queue Service

In this article, we will discuss the Amazon Simple Queue Service.

Purpose

The Amazon Simple Queue Service (SQS) is the message queuing service of Amazon.

Steps

In this article, we will work on the following steps: -

Create an SQS
Send and receive messages

So, let us get started.

Create An SQS

First, search the word SQS in the search box. Click on the Simple Queue Service service from the search result.

Picture showing the Simple Queue Service in search result in AWS console

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A screen will appear to create a queue. Click on the Create queue button.

Picture showing the Create queue button for creating the new queue

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In the create queue screen, enter the queue Type and the queue Name.

Picture showing entering the queue name in the Create Queue screen

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Scroll to the bottom and click on the Create queue button to create a queue.

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Send And Receive Messages

Once the queue is created, click on the Send and receive messages button in the details screen.

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A screen will appear where you can enter the message and click on the Send message button.

Picture showing the Send message section of the screen

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Scroll down to the Receive messages section and click on the Poll for messages button.

Picture showing the Receive messages section of the screen

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The message appears in the Messages grid. You can click on the message to see the message details.

Picture showing the message body of the recieve message

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Polling In SQS

Polling means visiting the set of queues to process the message. There are two types of polling that SQS supports: -

Short polling - Retrieves a subset of requests from a given queue. Basically, the short polling does not wait for message to arrive. It returns the message immediately even if message queue is empty
Long polling - Retrieves all the requests on the given queue. Basically, the long polling waits for message to arrive

How To Set The Polling?

While creating the queue, you can set the value of the Receive message wait time field. If the value is zero then it is called short polling. But if the value is between 1 and 20 then it is called long polling.

Picture showing the Configuration section while creating a queue

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Short Polling And Empty Response

In short polling, the AWS will keep on polling the queue to check if the message is present in the queue. If there is no message in the queue, then the result is the empty response. But the cost will be incurred even in the case of an empty response.

Types Of Queues

Standard Queue	FIFO Queue
Standard queues support nearly unlimited number of transactions per second	FIFO queues support up to 300 messages per second
Occasionally, messages were delivered in the order that is different from which they are sent	The order of message is strictly preserved
A message is delivered at least once. Occasionally, more than one copy of message is delivered	A message is delivered only once and remains in the queue until the customer process or delete the message

Posted By -	Karan Gupta

Posted On -	Wednesday, November 10, 2021

Updated On -	Wednesday, August 17, 2022

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