To make our program more fault tolerant, adding an Amazon SQS queue would help, as shown in Figure 5. This can cause a failure to process some of the images. If this application sends too many requests to Lambda, events can start to pile up. With this type of architecture, there is no contingency for dealing with multiple images arriving simultaneously in the S3 bucket. Results from Amazon Rekognition could be further processed by the Lambda function and stored in a database like Amazon DynamoDB. This initiates a Lambda function that sends the details of the uploaded image to Amazon Rekognition for tagging. From an architectural perspective (Figure 4), an image is uploaded to an S3 bucket, which generates an event notification. For example, a mobile application processes images uploaded by users and automatically tags the images with the detected objects using Artificial Intelligence/Machine Learning (AI/ML). One common use case for event driven processing, is when synchronous and reliable information is required. Point-to-point processing with S3 and Lambda as a destination This configuration is stored in the notification subresource, which you can find under the Properties tab within your S3 bucket, see Figure 1.įigure 4. Specify the destinations where you want Amazon S3 to send the notifications. To enable notifications, you must first add a notification configuration that identifies the events you want Amazon S3 to publish. This includes information about the object that initiated the event itself. When an event is initiated, a payload is created containing the event metadata. Events can be initiated by uploading, modifying, deleting an object, or other actions. We first must understand the types of events that can be initiated with Amazon S3 Event Notifications. This will allow you to implement an event driven architecture for a variety of common use cases.

In this blog post, we will illustrate how you can use Amazon S3 Event Notifications in combination with a powerful suite of Amazon messaging services. Amazon S3 Event Notifications provides users a mechanism for initiating events when certain actions take place inside an S3 bucket. Examples are ecommerce order processing, image processing, and other long running batch jobs.Īmazon Simple Storage Service (S3) is an object-based storage solution from Amazon Web Services (AWS) that allows you to store and retrieve any amount of data, at any scale. Decoupling is preferable for many workflows, as it allows each component to perform its tasks independently, which improves efficiency. This allows developers to create complex architectures by using the principle of decoupling. For example, the completion of an upload job may then initiate an image processing job. Event driven programs use events to initiate succeeding steps in a process.

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