What are SQS and SNS services and explain difference between them

This recipe explains what are SQS and SNS services and explain difference between them

Recipe Objective - What are SQS and SNS services and explain the difference between them?

The Amazon Simple Queue Service (SQS) is widely used and is defined as a fully managed message queuing service that enables users to decouple and scale microservices, distributed systems, and serverless applications. The Amazon SQS eliminates the complexity and the overhead associated with managing and operating message-oriented middleware and further empowers developers to focus on much-differentiating work. Using Simple Queue Service, users can send, store, and receive messages between software components at any volume, without losing messages or requiring other services to be available. The Amazon SQS provides easy steps to get started with it in minutes using the AWS console, Command Line Interface or Software Development Kit(SDK) of users choice and in three simple commands. The Amazon SQS offers two types of message queues i.e. Standard queues which offer maximum throughput, best-effort ordering, and at-least-once delivery and Amazon SQS FIFO queues are designed to guarantee that messages are processed exactly once and in the exact order that they are sent. The Amazon Simple Notification Service or Amazon SNS is widely used and is defined as a fully managed messaging service for both the application-to-application (A2A) and application-to-person (A2P) communication. For The A2A pub/sub, the functionality provides topics for the high-throughput, push-based, many-to-many messaging between the distributed systems, microservices, and event-driven serverless applications. Using the Amazon SNS topics, users publisher systems can find out the messages to a large number of subscriber systems which includes Amazon SQS queues, AWS Lambda functions, HTTPS endpoints, and Amazon Kinesis Data Firehose, for parallel processing. The A2P functionality further enables users to send messages to users at a scale via SMS, mobile push, and email.

Benefits of Amazon SQS and Amazon SNS

  • The Amazon SQS service eliminates the administrative overhead as AWS manages all the ongoing operations and underlying infrastructure needed to provide the highly available and scalable message queuing service. With the SQS, there is no upfront cost, no need to acquire, install, and configure messaging software, and no time-consuming build-out and maintenance of supporting infrastructure. Amazon SQS queues are dynamically created and scale automatically so building and growing applications quickly and efficiently can be done. The Amazon SNS simplifies and reduces costs with message filtering and batching. The Amazon SNS helps users simplify application architecture and further reduce costs. With message batching, publisher systems can send up to 10 messages in a single API request. With message filtering, subscriber systems receive only the messages that they are interested in.
  • The Amazon SQS reliably delivers messages. Also, Using Amazon SQS to transmit any volume of data, at any level of throughput can be done without losing the messages or requiring other services to be available. Amazon SQS lets users decouple application components so that they run and fail independently, further increasing the overall fault tolerance of the system. Multiple copies of every message are stored redundantly across multiple availability zones so that they are available whenever needed. The Amazon SNS ensures accuracy with the message ordering and deduplication. The Amazon SNS FIFO topics work with Amazon SQS FIFO queues to further ensure messages are delivered in a strictly-ordered manner and are only processed once. This enables users to maintain accuracy and consistency when processing the transactions across the single or multiple independent services.

System Requirements

  • Any Operating System(Mac, Windows, Linux)

This recipe explains Amazon SQS, Amazon SNS services and the difference between Amazon SQS and Amazon SNS.

Difference between Amazon SQS and Amazon SNS

    • Entity Type

Amazon SQS offers Queue as the entity type where Queue is similar to JMS and MSMQ. The Amazon SNS offers Topic-Subscriber as the Entity, that is Pub/Sub System Entity is offered by Amazon SNS.

    • Depends upon the Consumer type

The Amazon SQS treats all the consumers as all are supposed to be identical and hence process the messages in the same way. The Amazon SNS teats all the consumers are (supposed to be) processing the messages in different ways.

    • Persistent

The Amazon SQS messages are persisted for some duration is not consumer-available and the retention period value is from 1 minute to 14 days. The default is 4 days. The Amazon SNS offers no persistence that is whichever consumer is present at the time of message arrival gets the message and the message is deleted. If no consumers are available then the message is lost.

    • Depends upon Consumption of Message

The Amazon SQS has a Pull Mechanism that is it pulls Consumers poll messages from Amazon SQS. Further, the Amazon SNS has a Push Mechanism that is Amazon SNS pushes messages to the consumers.

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