Hystrix: Not able to view Hystrix Report on Hystrix Dashboard

Created on 22 Sep 2016 · 7Comments · Source: Netflix/Hystrix

I have a rest application(cxf based) which internally calls soap web services. I want to integrate hystrix in to my rest application.

1) Modified the below hystrix demo source code with our existing services data and deployed the rest application.

https://github.com/Netflix/Hystrix/tree/master/hystrix-examples/src/main/java/com/netflix/hystrix/examples/demo

2) I downloaded hystrix-dashboard war file and deployed in to tomcat and I can see the hystrix dashboard home page.

Now when I am trying to monitor the stream by providing the hystrix integrated rest application url.Empty page with hystrix icon is getting displayed. When I look IE developer console, it shows below error
EventSource is not defined.
proxystream variable value = undefined
Note: both are deployed on same machine - localhost

Source

Ahmed-A-Syed

Most helpful comment

Thanks muktesh..am able to connection to hystrix stream and u are right Jacobs. I tried with a simple app and when i hit hystrix stream app without dashboard in the browser ..it prints
ping:
ping:
ping:
ping:
After that when i accessed the hystrix stream app on hystrix dashboard.. dashboard displays metrics.
Thanks a lot.

Ahmed-A-Syed on 23 Sep 2016

👍3

All 7 comments

Sorry, am able to view the proxyStream variable. But still error comes as 'EventSource is not defined'

//code snippet from ie developer console
  var proxyStream = "../proxy.stream?origin=http://localhost:8080/hystrix/hystrix.stream;
  // start the EventSource which will open a streaming connection to the server
  var source = new EventSource(proxyStream);

Ahmed-A-Syed on 22 Sep 2016

Now am facing a new issue - 'Unable to connect to Command Metric Stream'.
when I hit the http://localhost:8080/hystrix/hystrix.stream url directly, it throws an error
"HTTP Status 503 - MaxConcurrentConnections reached: 5"

How to close the existing opened connections?

Ahmed-A-Syed on 22 Sep 2016

@Ahmed-A-Syed : It is happening since you browser is already tried to open connection to Hystrix stream and got error. There is a default limit of max 5 connections, after that you will get 503. (Please see handleRequest from HystrixSampleSseServlet).

Please restart you container to do the same or increase max number of concurrent connection using following property :
hystrix.config.stream.maxConcurrentConnections

mukteshkrmishra on 22 Sep 2016

To debug this, a good first step is to make sure that the metrics stream is available from the application using Hystrix.

Reboot that app to get it in a clean state, then try to directly curl the metrics stream. If that works, then the dashboard should work as well. Disclaimer: I'm not a front-end developer at all, so any sort of browser-specific issue will be very difficult for me to troubleshoot.

mattrjacobs on 23 Sep 2016

Ahmed-A-Syed on 23 Sep 2016

👍3

Great, thanks for letting us know

mattrjacobs on 27 Sep 2016

I am facing an issue with Hystrix metrics. I have a spring boot app and added actuator and HystrixCommand to my service and @EnableHystrixDashboard @EnableCircuitBreaker but still i am getting 404 http://localhost:8082/hystrix.stream i do see all other metrics of actuator on console but not the /hystrix.stream Any help is appreciated. Thanks a lot!