So by enabling this feature, AWS SQS uses an SHA-256 hash to generate the deduplication ID using the body of the message not the attributes of the message. This assures that your messages will be processed exactly once. ![]() If you retry to send an identical message within the 5-minute deduplication interval, the message will be tossed out. Please see Figure 1 for reference.įigure 1: PendingOrders.fifo created with Content-Based Deduplication enabled Content-Based Deduplication:įIFO queues do not allow for duplicate messages. You can see the URL for your SQS in the details screen of SQS in AWS console or by using the AWS CLI command aws sqs list-queues. The format of this URL is Take note of this URL, as it will need it to run the application (Set this in a SIXTHPOINT_SQSURL environment variable). Begin by creating an SQS queue call PendingOrders.fifo in a region of your choice with content-based deduplication enabled. This tutorial assumes you have an AWS account already created. Prevent a user from buying an item that isn’t available on a marketplace.What Is A FIFO Queue?Ī FIFO (first in, first out) queue is used when the order of items or events is critical, or where duplicates items in the queue are not permitted. The code for this application is available on Github. ![]() In this quick start tutorial, we will demonstrate how to configure a FIFO queue for a fictional online marketplace. Please keep that in mind as you read the post.ĪWS SQS (Simple Queue Service) can provide developers with flexibility and scalability when building microservice application(s). Attention: The following article was published over 4 years ago, and the information provided may be aged or outdated.
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