GCP Pub/Sub Message Delay with Node.js - How to Reduce Latency?
I'm stuck trying to I'm stuck trying to I've been researching this but I'm testing a new approach and I've searched everywhere and can't find a clear answer..... I'm currently experiencing important delays when processing messages from GCP Pub/Sub using Node.js. My setup involves a Cloud Function that is triggered by Pub/Sub messages, and I've noticed that the time between a message being published and processed can vary greatly, often taking upwards of 15 seconds, which is unacceptable for my application. I've tried configuring the function with a higher memory allocation, expecting that it might boost performance. My function is defined like this: ```javascript const { PubSub } = require('@google-cloud/pubsub'); const pubsub = new PubSub(); exports.processMessage = async (message, context) => { const data = Buffer.from(message.data, 'base64').toString(); console.log(`Processing message: ${data}`); // Simulate some processing delay(5000); // Simulating a 5 seconds processing delay }; const delay = (ms) => new Promise(resolve => setTimeout(resolve, ms)); ``` In this snippet, I am simulating a 5-second processing time, but the overall time from publishing to completion often exceeds my expectations. I also checked the Pub/Sub metrics and noticed that while the messages are being enqueued quickly, the acknowledgment process seems to be delayed, with spikes in the 'Acknowledgment Latency' metric. I have set the retry policy to 'exponential' to handle transient errors, but it doesn’t explain the consistent latency. Additionally, my Cloud Function is set to allow up to 540 seconds of execution time, which seems more than sufficient. I am also using the latest version of the `@google-cloud/pubsub` library. Could there be any configuration issues or best practices that I might be overlooking? Any insights on optimizing the message processing time would be greatly appreciated. I'm on Ubuntu 22.04 using the latest version of Javascript. I'm working with Javascript in a Docker container on Linux. Thanks for any help you can provide! I appreciate any insights!