GCP Pub/Sub message delivery delay affecting Cloud Functions triggering with Node.js
I've hit a wall trying to I've encountered a strange issue with I'm using Google Cloud Pub/Sub to trigger a Cloud Function whenever a new message is published to a specific topic. However, I'm experiencing unexpected delays in message delivery. Sometimes it takes several minutes for the function to be invoked after a message is published, which is unacceptable for my use case where near real-time processing is essential. I have set up the Pub/Sub topic and subscription as follows: ```javascript const { PubSub } = require('@google-cloud/pubsub'); const pubSubClient = new PubSub(); const topicName = 'my-topic'; async function publishMessage(data) { const dataBuffer = Buffer.from(data); await pubSubClient.topic(topicName).publish(dataBuffer); console.log(`Message published: ${data}`); } ``` The Cloud Function is defined like this: ```javascript exports.processMessage = (message, context) => { const data = Buffer.from(message.data, 'base64').toString(); console.log(`Processing message: ${data}`); }; ``` I have verified that the Pub/Sub subscription is set to "Pull" and I've assigned the correct Cloud IAM roles to the service account running the Cloud Function. I also checked the metrics in the GCP console and see that the messages are being published correctly and acknowledged, but I'm puzzled by the inconsistent latencies in processing. I tried to increase the function's memory allocation and set the timeout to a higher value, but that didn’t seem to have any effect on the message delivery speed. Additionally, I made sure that the function is running in the same region as my Pub/Sub topic to minimize latency. Despite these efforts, I still experience delays ranging from a few seconds up to several minutes at times. Is there anything else I can check or optimize in my configuration or code to enhance the message delivery speed? Any recommendations on best practices for ensuring low-latency processing in this setup would be greatly appreciated! I'm coming from a different tech stack and learning Javascript. I'm on Windows 10 using the latest version of Javascript. Thanks for your help in advance!