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Memory LIMIT and REQUEST in Containers and JVM

• Do you run a JVM inside a container on Kubernetes (or maybe OpenShift)?
• Do you struggle with REQUEST and LIMIT parameters?
• Do you know the impact of those parameters on your JVM?
• Have you met OOM Killer?

Hope you will find answers to these questions in this example-based article.

How to set up JVM Heap size in a Container

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import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandler;
import java.time.Duration;
import java.util.concurrent.CompletableFuture;

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import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.AppenderBase;
import org.junit.jupiter.api.Assertions;
import org.slf4j.LoggerFactory;

import java.time.Duration;
import java.util.concurrent.CountDownLatch;

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