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Fuse Integration Service - Auto Dealership Management Demo, Part Five

This series of blog is based on building an auto dealership management system on Fuse Integration Service. We will be creating three major functions in the system.
  • Sales report tracking 
  • Vehicle inventory status
  • Customer IoT Service
We have exported a sales report to a web page, provide current inventory status of available cars through web service. And collect customer data from IoT devices on their car then alert close by shops. Now all the application are up on OpenShift, here are some of the things we will face after our application leave developer's laptop onto testing, production phase. With the new Fuse Integration Service, it is now really easy to package and startup and shutdown running instance, so we can update more frequently. But when it comes to clients trying to connect to the service, maybe this is not a great news to them, all these constant start up and shutting down, what happen if they are in the middle of a request? 

Here is a neat thing in Fuse Integration Service, instead of forcing every pod/instance to shutdown and running the new application instantly, we can do rolling upgrades. Yes, I am going to show you how to do rolling upgrades with our fabric8 maven plugin. 

ROLLING UPGRADE

Before we get to the "how", lets take a look at what does rolling do. Normally when we do fabric8:apply, what it does, is pushing the application onto our project in OpenShift, and then it'll quickly spin up a new pod/instance running the updated application, and simultaneously kills the old running pods/instances.  But for rolling upgrade, it does things a little different. 

First of all, it will spin up pods/instance running the updated application, 

Instead of killing all the old running pods instantly, it will slowly terminate each pod that does not have any connection, and new incoming request will be redirect to new application pods. 
With this scenario, client still in transaction will not suddenly break out from it, and new client request will go to the pods that will continue to run. 

Slowly the updated application will be replace with new running pod. 

So, how do we do rolling upgrade? Simple, simply add fabric8.rolling=true when running fabric8:apply in maven. 

  • mvn fabric8:apply -Dfabric8.rolling=true

And that's all you have to do! Simple! 




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