I'm trying to use Webclient in my project, but when I load test, I'm noticing the docker memory usage never goes down until the instance dies.
@Component
public class Controller {
//This is an endpoint to another simple api
//I use my local Ip instead of localhost in the container
private static final String ENDPOINT = "http://localhost:9090/";
private WebClient client;
public Controller(WebClient.Builder client) {
super();
this.client = client.build();
}
@Bean
public RouterFunction<ServerResponse> router() {
return RouterFunctions.route(GET("helloworld"), this::handle);
}
Mono<ServerResponse> handle(ServerRequest request) {
Mono<String> helloMono =
client.get().uri(ENDPOINT + "/hello").retrieve().bodyToMono(String.class);
Mono<String> worldMono =
client.get().uri(ENDPOINT + "/world").retrieve().bodyToMono(String.class);
return Mono.zip(helloMono, worldMono, (h, w) -> h + w)
.flatMap(s -> ServerResponse.ok().bodyValue(s));
}
}
Here's my dockerFile as well.
FROM openjdk:8
ENV SERVICE_NAME reactive-hello-world
ADD target/reactive-hello-world-*.jar $APP_HOME/reactive-hello-world.jar
RUN mkdir /opt/reactor-netty/
EXPOSE 9010
CMD java \
-Dcom.sun.management.jmxremote=true \
-Dcom.sun.management.jmxremote.local.only=false \
-Dcom.sun.management.jmxremote.authenticate=false \
-Dcom.sun.management.jmxremote.ssl=false \
-Djava.rmi.server.hostname=localhost \
-Dcom.sun.management.jmxremote.port=9010 \
-Dcom.sun.management.jmxremote.rmi.port=9010 \
-Xmx190M \
-jar reactive-hello-world.jar
EXPOSE 8080
Have I missed a step somewhere?
Edit: Here's some images
Before Load Test:
After Load Test
As you can see, the GC is happening correctly but the memory hasn't decreased. If I let the test continue it kills the instance in a couple minutes.
I've tried similar code using RestTemplate and I'm not experiencing any issues, the memory doesn’t usually exceed 400MB even when I run the Jmeter for an extended time. Can you help understand what's happening?
Edit: I've also tried the deprecated AsyncRestTemplate and I'm not seeing a problem with that either.
Edit: I have created the repos for this example. Please check if you can reproduce the issue.
The Webclient Hello World(JMX is inside this repo)