9/22/2023 0 Comments Sqs queue trigger lambdaIf there is any error while processing the messages in the queue, the message will not be deleted after the execution of function. You can investigate these messages later. const nodeJsFunctionProps: NodejsFunctionProps = ) SQS queue creation with receiveMessageWaitTime and visibilityTimeout Dead letter queueĭead letter queue is another queue to store the messages which are not successful in processing. Both of these services are going to use AWS Lambda.īelow are the generic properties for both of these lambda functions. Service A would be writing to SQS Queue and Service B would be reading from the same SQS Queue. We're going to create 2 services - Service A and Service B using AWS Lambda. Producer and Consumer service creation using Lambda const queue = new sqs.Queue(this, 'AwsLambdaSqsQueue') SQS queue creation You can use below code snippet to create Standard SQS queue. We'll create above architecture using AWS CDK Let's write some code to see it in action. So, when the Service B comes up again - it can pick up where it left off - processing all the remaining messages in the queue. When Service B goes down - the messages sent by Service A would be still in SQS queue. Microservices with queuing system (Lambda-SQS) Instead of directly sending messages between services, we use a queuing system with SQS Queue as intermediary. In below diagram, these are same services ( Service A and Service B ) backed by AWS Lambda. In this scenario, messages would get lost, which you might not want to happen. What would happen to the messages sent by Service A? The consuming service Service B goes down.Now, tell me what would happen in below scenario inter service communication without any queuing system Let's assume that you're not using any kind of queuing system here. One service, say Service A, is producing messages and another service ,say Service B, is consuming messages. Let's consider a scenario - where you've multiple services in a microservices environment. Why you would use SQS with Lambda? What are its use cases? Internally, AWS stores your messages in many servers to have redundancy. You can send, store and retrieve messages from SQS. SQS is a managed queuing service from AWS. It follows event driven architecture - meaning if any event happens - your lambda code will be invoked automatically. Download the free ebook on AWS Lambda here Introductionīefore discussing about using AWS Lambda with SQS, let us discuss about some basics What is AWS Lambda?ĪWS Lambda lets you to run your code without provisioning servers.
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