AWS SQS Messages Delayed Even After Long Polling Configuration in Node.js
I'm stuck on something that should probably be simple. I'm currently working with an scenario with AWS SQS where messages are experiencing important delays even though I've configured long polling with a wait time of 20 seconds. I've set up my queue and Lambda function using the AWS SDK for Node.js version 3.x. My function is designed to process messages as soon as they arrive in the queue, but I've noticed that some messages are exploring for over a minute before being processed. Here’s a snippet of my Lambda function where I receive messages: ```javascript const { SQSClient, ReceiveMessageCommand } = require('@aws-sdk/client-sqs'); const client = new SQSClient({ region: 'us-west-2' }); const queueUrl = 'https://sqs.us-west-2.amazonaws.com/123456789012/MyQueue'; exports.handler = async (event) => { try { const params = { QueueUrl: queueUrl, WaitTimeSeconds: 20, MaxNumberOfMessages: 10, }; const data = await client.send(new ReceiveMessageCommand(params)); if (data.Messages) { // Process messages for (const message of data.Messages) { console.log('Processing message:', message.Body); // Simulate processing await processMessage(message); } } } catch (behavior) { console.behavior('behavior receiving messages:', behavior); } }; async function processMessage(message) { // Simulated processing logic return new Promise((resolve) => setTimeout(resolve, 1000)); } ``` I’ve ensured that the queue's `ReceiveMessageWaitTimeSeconds` attribute is set to 20, as confirmed in the AWS console. However, I still observe messages being delayed, and the Lambda function is not triggered instantly after they are sent to the queue. I also verified that my Lambda function has the necessary permissions to access the SQS queue. To troubleshoot, I’ve added logging to check the `ApproximateNumberOfMessagesVisible` and `ApproximateNumberOfMessagesNotVisible` metrics, which seem to fluctuate as expected, but the delays continue. Is there anything I'm overlooking, or best practices I should consider for optimizing the real-time processing of messages in SQS? Any insights or similar experiences would be greatly appreciated. My development environment is Windows. How would you solve this?