When the connections-per-thread limit is reached, requests result in 503 responses. Is the problem resolved by increasing the connections-per-thread value to 50 or 100?
Hello,
We are trying to build an API gateway using undertow as a servlet extension, this has been working great until we started our performance tests.
Our setup is two gateways balancing traffic towards 10+ servers and we are using JBoss EAP 7.0 We have observed that some of our requests fail with 503 response. When we get a 503 response from a request, we have also observed that it never reaches the proxy
target.
I made a small test on my machine to see if I could get the same error, to my surprise this was very easy. First I tried with the following code.
public class ApiGatewayServletExtension implements ServletExtension {
@Override
public void handleDeployment(DeploymentInfo deploymentInfo, ServletContext servletContext) {
LOG.info("Deploying {}...", MethodHandles.lookup().lookupClass().getSimpleName());
deploymentInfo.addInitialHandlerChainWrapper(handler -> {
try {
LoadBalancingProxyClient loadBalancer = new LoadBalancingProxyClient()
.setConnectionsPerThread(20);
return new ProxyHandler(loadBalancer, 30000, handler);
} catch (URISyntaxException ex) {
throw new IllegalStateException(ex);
}
});
}
}
I used JMeter with 20 threads making a simple rest GET request and after 30 seconds or so the test stopped with a 503 response.
Then I created a small java application using undertow 2.0.17.Final like this.
public static void main(final String[] args) {
try {
LoadBalancingProxyClient loadBalancer = new LoadBalancingProxyClient()
.setConnectionsPerThread(20);
ProxyHandler proxyHandler = new ProxyHandler(loadBalancer, 30000, ResponseCodeHandler.HANDLE_404);
Undertow server = Undertow.builder()
.addHttpListener(8080, "localhost")
.setHandler(proxyHandler).build();
server.start();
} catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
Getting the same result. I have also tried just loading the home page of one of our servers and still the same result.
Any help would be very much appreciated. I have not created a bug because I'm pretty sure we are just missing something here.
Regards Joakim Eriksson.
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