AWS Crash Course – SQS

Today we will discuss about an AWS messaging service called SQS.

  • SQS is Simple Queue Service.
  • It’s a messaging queue service which acts like a buffer between message producing and message receiving components.

  • Using SQS you can decouple the components of an application.
  • Messages can contain upto 256 KB of text in any format.
  • Any component can later retrieve the messages programmatically using the SQS API.
  • SQS queues are dynamically created and scale automatically so you can build and grow applications quickly – and efficiently.
  • You can combine SQS with auto scaling of EC2 instances as per warm up and cool down.
  • Used by companies like Vodafone, BMW, RedBus, Netflix etc.
  • You can use Amazon SQS to exchange sensitive data between applications using server-side encryption (SSE) to encrypt each message body.
  • SQS is pull(or poll) based system. So messages are pulled from SQS queues.
  •  Multiple copies of every message is stored redundantly across multiple availability zones.
  • Amazon SQS is deeply integrated with other AWS services such as EC2, ECS, RDS, Lambda etc.

 

Two types of SQS queues:-

  • Standard Queue
  • FIFO Queue

Standard Queue :-

  • Standard Queue is the default type offered by SQS
  • Allows nearly unlimited transactions per second.
  • Guarantees that a message will be delivered at least once.
  • But it can deliver the message more than once also.
  • It provides best effort ordering.
  • Messages can be kept from 1 minute to 14 days. Default is 4 days.
  • It has a visibility time out window. And if order is not processed till that time, it will become visible again and processed by another reader.

 

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FIFO Queue :-

  • FIFO queue complements the standard queue.
  • It has First in First Out delivery mechanism.
  • Messages are processed only once.
  • Order of the message is strictly preserved.
  • Duplicates are not introduced in the queue.
  • Supports message groups.
  • Limited to 300 transactions per second.

 

Hope the above snapshot give you a decent understanding of SQS. If you want to try some handson check this tutorial .

This series is created to give you a quick snapshot of AWS technologies.  You can check about other AWS services in this series over here .

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