Spring boot cold start

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I have a spring boot application which I'm running inside docker containers in an openshift cluster. In steady state, there are N instances of the application (say N=5) and requests are load balanced to these N instances. Everything runs fine and response time is low (~5ms with total throughput of ~60k).

Whenever I add a new instance, response time goes up briefly (upto ~70ms) and then comes back to normal.

Is there anything I can do to avoid this type of cold start? I tried pre-warming the app by making ~100 curl calls sequentially before sending traffic, but that did not help?

Do I need better warmup script with high concurrency? Is there a better way to handle this?


If your application is healthy when you serve a request to it, but you still have a problem with slow response, you should try to enable Tiered Compilation

-XX:CompileThreshold -XX:TieredCompilation

Normally, the VM uses the interpreter to collect profiling information on methods that are fed into the compiler. In the tiered scheme, in addition to the interpreter, the client compiler is used to generate compiled versions of methods that collect profiling information about themselves.

Since compiled code is substantially faster than interpreted code, the program executes with better performance during the profiling phase.

Faster Cold Starts of Spring-Boot in AWS Lambda, Cold start of 1.5 GB Lambda takes about 14-15 seconds - 10 seconds less than before. Does it improve anything for 3GB Lambdas? It can, because it eliminates cases when spinning up context takes more than 10 seconds, which can randomly happen, depending on AWS load. Spring boot cold start. Ask Question Asked 9 months ago. Active 9 months ago. Viewed 1k times 8. 4. I have a spring boot application which I'm running inside docker

we faced a similar issue with our microservices , in order to warmup we added a Component

ApplicationStartup implements ApplicationListener<ApplicationReadyEvent> 

within the application to make a call to the services just after application startup,this worked for us. with this solution it is guarentted that all class that will be used in your payload will be loaded just after the startup of the instance in every instance you start and you dont need external script to make calls . Also problem with external script we can not say for sure that calls where handled by the new instance .

public class ApplicationStartup implements ApplicationListener<ApplicationReadyEvent> {

    YourService yourService;

    public void onApplicationEvent(final ApplicationReadyEvent event) {

        System.out.println("ApplicationReadyEvent: application is up");
        try {
            // some code to call yourservice with property driven or constant inputs 
        } catch (Exception e) {


Is it Cost Effective to Deploy a Spring Boot Application as a Lambda , Java Container library because I would have expected cold start times for a Spring Boot application to be unreasonable for a serverless API. AWS Lambda cold start issue with spring boot. Ask Question Asked 3 months ago. Active 3 months ago. Viewed 133 times 0. I am new to aws lambda and I am moving my

First of all, I'd try to enable JIT compilation and compare results. There's a good article in Baeldung comparing Graal performance with the default C1 and C2 JIT compilers -- you may want to run some tests against your workload. Basically, you need to set the following options when running your Java application:

-XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler

Also, make sure you've configured readiness probe in OpenShift using Spring Boot's actuator health check URL (/actuator/health). Otherwise your container may receive traffic before being ready to serve.

A readiness probe determines if a container is ready to service requests. If the readiness probe fails a container, the endpoints controller ensures the container has its IP address removed from the endpoints of all services. A readiness probe can be used to signal to the endpoints controller that even though a container is running, it should not receive any traffic from a proxy. Set a readiness check by configuring the template.spec.containers.readinessprobe stanza of a pod configuration.

Finally, having your responses being cached by NGINX or some other reverse proxy also helps.

Cold start / Warm start with AWS Lambda, Even if Spring is not slow to run, adding libraries (spring-boot-starter-web, spring- data-dynamo, etc.) makes everything longer to initialize. A� Cold boot is the process of starting a computer from shutdown or a powerless state and setting it to normal working condition. A cold boot refers to the general process of starting the hardware components of a computer, laptop or server to the point that its operating system and all startup applications and services are launched. Cold boot is also known as hard boot, cold start or dead start.

Spring Boot quick start, Big fan of both Spring Boot and AWS Lambda/Serverless computing. it up, and response time needs to be under a second or two, it sucks because cold starts. Spring Boot facilitates project setup with most common defaults and ready to use configurations, which is undeniably great because it saves us precious time. Yet, for newcomers to the framework it might hide some of the old features which are present in Spring for many years.

Does anybody use Spring Boot with AWS Lambda? Do you , The actual problem with having a lot of dependencies is the number of classes you have to load. Let's take a sample SpringBoot application that� Those instances are much more powerful, resulting in a "cold start" that will easily be under 5 seconds (including less than 2 seconds for Spring Boot to start). They also provide "pre-warmed" instances which will remove most of the issue anyway, as there will always be active instances ready to serve requests. Is Spring Boot fast enough?

AWS Lambda Java Tutorial: Best Practices to Lower Cold Starts , or loading heavy frameworks like Spring Boot. In our analysis of production usage, this causes by far the largest share of overall cold start� Spring Quickstart Guide Step 1: Start a new Spring Boot project Use start.spring.io to create a “web” project. In the “Dependencies” dialog Step 2: Add your code Open up the project in your IDE and locate the DemoApplication.java file in the Step 3: Try it

  • This sounds more like an OpenShift configuration problem.
  • @chrylis Could you please elaborate?
  • @Vikk, you should elaborate the question itself too. What does your application do? I would personally try to deploy a sample spring boot app and perform a test with it. If the same issue happens, then it's openshift related.
  • It could be JVM/JIT warm-up time. I would guess lazy class loading - for which making a bunch of curl calls is a good start - or JIT optimations for which calling the critical code about 100 times isn't enough (default: -xx:CompileThreshold=10000 afaik). Or, depending on what your application is actually doing, it could be necessary to warm up cache
  • Are you using pre-deployed images? What's the memory consumption per instance? Can you increase the overall allocated memory per node and test?