Debugging AWS Lambda Cold Start Performance Issues in Java 11 with Spring Boot
After trying multiple solutions online, I still can't figure this out..... Currently developing a microservice that runs in AWS Lambda, leveraging Java 11 and Spring Boot. Recently, I've noticed significant latency during cold starts, especially with the initialization of beans. I've tried several approaches to mitigate this, such as reducing the number of beans loaded at startup and optimizing my configuration. For context, here's a snippet from my `SpringBootApplication`: ```java @SpringBootApplication public class MyLambdaApplication { public static void main(String[] args) { SpringApplication.run(MyLambdaApplication.class, args); } } ``` To streamline the startup time, I've configured my lambda function with a memory size of 512 MB, as AWS documentation suggests that a higher memory allocation could reduce cold start duration. I also enabled the Spring Boot lazy initialization feature: ```yaml spring: main: lazy-initialization: true ``` Despite these efforts, cold starts are still around 3-5 seconds, which is impacting user experience. During a debugging session, I noticed that certain beans, particularly those connecting to external services, take longer to initialize. Is there a more effective way to handle bean initialization or perhaps adjust my AWS Lambda configuration to improve performance? Additionally, I've explored using the AWS Lambda Provisioned Concurrency feature. However, the cost implications from AWS's pricing model are a concern. Has anyone successfully balanced performance with costs in this scenario? I'm working on a CLI tool that needs to handle this. Any help would be greatly appreciated! I'd really appreciate any guidance on this.