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Post By Admin Last Updated At 2021-03-16
Understanding AWS SQS

In terms of technology, a queue is nothing but a series of objects or a list of tasks that is ready to process. It plays an important role in the several managed IT services for different organizations. For example, we can take the tasks that a CPU performs. Once it completes a task of computation, it is ready for the next job waiting in a queue for processing. In this way, Amazon also provides a different version of queues that perform various tasks in the form of AWS SQS. SQS refers to Simple Messaging Service within Amazon Web Services that provides users to access a message queue. Moreover, it is useful to store messages that wait for processing through a computer system.

Hence, it works like a distributed queue system for different tasks that allows web service apps to quickly queue up messages. These messages are produced by one component for consumption by another component. In this case, the queue becomes a short-term repository for the messages waiting for processing. 

Let us discuss the various aspects of AWS SQS, how it works, and its major benefits in the following content.

What is AWS SQS?

AWS SQS is another name for Amazon SQS-Simple Queue Service is a message queue system useful for various processes. It helps them to communicate with each other while carrying out various operations. AWS SQS supports two different types of queue services such as- Standard Queues and FIFO Queues (First-in-First-Out). 

Moreover, it’s a completely manageable message queuing service and it allows users to dissociate and scale various services. Such as microservices, allocated services, and serverless apps. Also, Amazon Simple Queue Service eliminates the overhead and the difficulty related to messaging and message operating based middleware. Moreover, it authorizes developers to concentrate on the distribution of work. 

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How does AWS SQS work?

Amazon or AWS SQS is an allocated queue system that enables service apps to queue messages produced by one component for another component’s consumption. Moreover, by using AWS SQS, a user can store, send, and receive messages between software components irrespective of volume. Here, it doesn’t lose any messages or other services to be available there. 

It works as a short-term message storage repository useful in processing with lower rate while messages produced at a higher volume.

Further, AWS SQS is successful in many industries in providing the required services in the messaging queue process. It handles many complex tasks very simply and within a time-bound. There are majorly three components involved in AWS SQS. Such as- distributed messaging system, queue, and the messages with the queue.  The architecture of AWS SQS is based on two components- distributed messaging and the AWS SQS messaging lifecycle.

In the following image, you can see that the system has many - Producers (the components that send various messages to the queue system), and Consumers (components receiving messages from queues). Here the queue unnecessarily stores the various messages across the AWS SQS Servers. 


AWS SQS life cycle

The AWS SQS lifecycle defines the way of messages creation and deletion within a queue system.

In the beginning, the first component produces the message “A” and sends it to the queue. Then the message gets allocated across the Amazon SQS servers. 

Next, the second component consumes the message “A” and starts processing it. Here, after a component gets a message, the AWS SQS sets a time limit (visibility timeout) for stopping another component to get messages and process them. Till the visibility timeout ends the message stays in a queue. The default duration of visibility timeout for a message is around 30 seconds. 

Here, the minimum timeout is 0 seconds and the maximum limit is 12 hours The AWS SQS doesn’t automatically delete any message as it’s an allocated queue system. Hence, there is no guarantee that a message actually received by a consumer. But the consumer has the right to delete the message after getting and processing it. 

Let us move further to know more about Amazon Simple Queue Service or SQS.

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Benefits of using AWS SQS

There are many useful benefits of AWS SQS in the IT industry. The following are-:

Beats Administrative Overhead

AWS SQS is capable of managing all in-progress operations and the underlying infrastructure. It is required for quality scalable and highly available message queuing service (MQS). This messaging service saves upfront costs, installation, acquisition, and configuring messaging software. There is not at all a need for these services including time-consuming built-out and infra maintenance. 

Further, the simple queueing services dynamically build queues and automatically scale up. Hence, it helps you to develop and grow various apps with great efficiency and in a faster way.

Elastic and cost-effective scaling 

Amazon Simple Queue Service extremely uses the AWS cloud service to dynamically scale based on requirements. Moreover, SQS scales with elasticity so that a user doesn’t need to worry about capacity planning and pre-provisioning. There is no limitation on the number of messages left per queue. Also, the general queues offer unlimited throughput. Besides, there is a significant cost saving in this model against the self-managed messaging middleware that is always-on.

Reliable message delivery

This messaging service, SQS, offers reliable message delivery without losing any messages. It helps in transmitting any volume of data with good throughput. Amazon SQS helps to separate the app components where they run and fail independently. Hence, this model enhances the failure tolerance of the existing system. It helps to store several copies of messages throughout the availability zones. This facilitates that users can use the available messages whenever they need. Further, the queue acts as a shield between the component generating data and the saving data. Then the component gets the data for processing. 

Securing sensitive data

The AWS SQS offers a secure transmission service for exchanging sensitive data across applications. It uses SSE- server-side encryption that encrypts each message body thoroughly. Moreover, the integration of AWS SQS SSE with Aws Key management service allows users to centrally manage the message keys. They provide great protection to the SQS messages and also to the other AWS resources well. 

The messages can include 256 kb of text in different formats such as JSON, xml, etc. Here, the KMS or key management service logs every encryption to the AWS cloud to cover various needs. 

Hence, these are a few benefits of Amazon SQS and the services that the queue system provides to users. Now we will move further in this content to get some more idea on SQS. 

Types of Queues

Here, we will learn the different types of queues available in Amazon SQS. There are types of queues available- Standard and FIFO.

The Standard Queues of SQS are the default one that provides unlimited transactions each second. This service guarantees that a message is delivered at once and sometimes more than one copy might get delivered out of order. 

Also, it ensures that the messages are delivered as per the order in general but it doesn’t guarantee it.

On the other side, the FIFO Queue model guarantees that the message sent in a particular order is also received in the same order. The main feature of this queue system is the message remains with the user until he processes and removes it. Also, it doesn’t allow duplicates to be introduced within the existing queue. The FIFO queue supports the message groups that enable multiple ordered message batches under a single queue. Finally, the FIFO queues have a limitation of 300 transactions/second. They include almost all the features of Standard Queues. 

AWS SQS Features

There are many features of Amazon Simple Queue Services which are as follows.:-

Confidential secure data

The SSE or Server-side encryption facility under SQS enables transmitting highly secure, sensitive, and confidential data. It provides the Key management services as a protection to the messages present within the queues. 

Less data wastage

The Amazon SQS makes sure the messages sent to the components are not lost and stay secure. This message data stores on different general/standard queues. 

Message Locking facility

Amazon SQS helps in message locking when the receiver gets during the process. It makes the other producers send the message to the receivers securely. In case, the processing of messages get fail then the lock will expire and the message will be available again for processing.

Message retain

The message can be retained within the queues up to a maximum period of 14 days. 

Queue Sharing

AWS Simple queue service offers queue sharing securely either anonymously or with a secure Amazon account. This sharing can put on restriction by the time it is shared in a day and also through the IP address of the system. 

Unlimited data 

Users can generate SQS queues using an unlimited message within any region.  

Work Queues

It allows separating components of an allocated application. So that may not all process the same quantity of work in parallel.

Buffer and group Operations

It helps to add scalability and reliability to the user’s system architecture.  Further, it smoothly deals with the data without losing messages or enhancing latency.

Request Offloading

It allows moving slow operations off for the interactive request paths by adding a queue of similar items for the request.

Also, Simple Queue Service provides high scalability and resiliency of the messages. It helps to save the messages from failure and process them securely.

Thus, these are some of the features of Amazon SQS. Let us know the popular use cases held with this system.

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In Amazon, AWS SQS and SNS both are the standard messaging systems that make the smooth performance of events.

About SQS we have seen in the above paragraphs. Now, coming to Amazon SNS (Simple Notification Service), is a type of managed messaging service offers vary fast and flexible push notifications. It helps in device-to-device and application-to-person communications. This service provides users to send messages to huge mobile users, email recipients, and also the allocated services. 

Let us know the key differences between the both messaging services of Amazon. 

Amazon SNS is a notification service with an entity ‘topic” where SQS is a message queueing service with entity “Queue”. 

In SQS, the message consumption is through a pull mechanism, and in the SNS the consumption uses a push mechanism.

Coming to the use case, SQS uses the separation of two apps and enables processing in parallel asynchronously. In AWS SNS, it uses “Fanout” that enables the same message processed in different ways.

In persistency, there is no such thing in AWS SNS because the message is lost in the absence of a customer. Coming to SQS, their message persists or preserves for some time if the customer is absent to receive. 

Moreover, in SNS, all the consumers process the messages in multiple ways. But in SQS the consumers might be identical and process the messages received in a similar way. 

These are some of the key differences between the SNS and SQS services under Amazon.

AWS SQS use cases

There are many popular use cases of AWS SQS where we can explore the following use cases.

The big giants in the blogger that used the SQS services of Amazon are - NASA, BMW, Redbus, Capital One, oyster (hotel reviews), etc. These companies used AWS Simple Queue Services for various purposes in their business operations. Somewhere AWS SNS also used in this regard.

All the services commonly include the messaging services in queues by storing and processing them. 

AWS SQS offers the best services at the best price along with free usage in both standard and FIFO queues. Further, the applicable charges depend upon the usage of services with some limitations.


Hence, we reached to wrap up the discussion on understanding AWS SQS-Simple Queue Service. I hope it will help you to understand the actual meaning of SQS and its importance in Amazon web services. The companies that are using this service are also getting good benefits from it with lots of changing features. There are many more to come in this space of AWS with the latest updates. SQS services provide the tasks to process different types of messages that come into the device in the queue system. There are many things under this platform to know in detail song with the services. To get these details in a practical way through industry experts, get into the AWS Online Training with ITGuru. This learning can take you to explore new things in AWS.