Introduction

I tried Hystrix in the previous article Circuit breaker pattern with Apache Camel. Hystrix has a Dashboard that can graphically display the state of the circuit, so this time I will move it.

The combination of Apache + Spring Boot seems to be able to run Hystrix Dashboard using Spring Cloud Netflix components. However, I will not use Spring Boot this time, so let's run Hystrix Dashboard in a standalone application.

Output Hyryx Metrics in your application

Use hystrix-metrics-event-stream to allow your application to output Hyrix Metrics.

First, add the following library (for Maven).

<dependency>
    <groupId>com.netflix.hystrix</groupId>
    <artifactId>hystrix-metrics-event-stream</artifactId>
    <version>1.5.18</version>
</dependency>

Embed jetty in your application to make hystrix-metrics-event-stream available. The URL is "http: //localhost:8090/hystrix.stream".

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;

import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;

~ Omitted ~

			Server server = new Server(8090);
			ServletContextHandler servletContext = new ServletContextHandler(ServletContextHandler.NO_SESSIONS);
			server.setHandler(servletContext);
			final HystrixMetricsStreamServlet servlet = new HystrixMetricsStreamServlet();
			final ServletHolder holder = new ServletHolder(servlet);
			servletContext.addServlet(holder, "/hystrix.stream");
			server.start();

Download and launch the standalone version of Hystrix Dashboard

First, go to the following page and download the Hystrix Dashboard standalone version jar file.

https://bintray.com/kennedyoliveira/maven/standalone-hystrix-dashboard/1.5.6

As of January 2019, 1.5.6 was the latest version. The downloaded file will be "standalone-hystrix-dashboard-1.5.6-all.jar".

After downloading, execute the following command to start Hystrix Dashboard.

>java -jar standalone-hystrix-dashboard-1.5.6-all.jar
21:13:03.272 [vert.x-eventloop-thread-0] INFO  c.g.k.h.c.s.d.HystrixDashboardVerticle - Initializing the HystrixDashboardVerticle instance 1
21:13:03.571 [vert.x-eventloop-thread-0] INFO  c.g.k.h.c.s.d.HystrixDashboardVerticle - Compression support enabled: true
21:13:03.901 [vert.x-eventloop-thread-0] INFO  c.g.k.h.c.s.d.HystrixDashboardVerticle - Listening on port: 7979
21:13:03.901 [vert.x-eventloop-thread-0] INFO  c.g.k.h.c.s.d.HystrixDashboardVerticle - Access the dashboard in your browser: http://localhost:7979/hystrix-dashboard/
21:13:03.902 [vert.x-eventloop-thread-1] INFO  i.v.c.i.l.c.VertxIsolatedDeployer - Succeeded in deploying verticle

The URL to access the Hystrix Dashboard is as follows.

http://localhost:7979/hystrix-dashboard/

When you access it, the following screen will be displayed.

After the screen is displayed, enter "http: //localhost:8090/hystrix.stream" in the text box below the text "Eureka Application ~" and click the "Add Stream" button. .. Next, click the "Monitor Streams" button to move to the screen below.

When the error rate exceeds 50%, "Circuit" is set to open. How to read the graph is as follows.

[JAVA] Circuit Breaker Pattern with Apache Camel Part 2 (Try Hystrix Dashboard)

Introduction

Output Hyryx Metrics in your application

Download and launch the standalone version of Hystrix Dashboard

reference