Geek Answers Handbook

What instances stop when I shrink my role in Azure?

Suppose I have an Azure role with three instances running. I ask Azure to change the number of roles to two, either through the management portal or through the management API.

How will Azure decide which role to take?

+2
source share
2 answers

As noted by the British developer, the Windows Azure Fabric Controller decides which instances will be closed. You cannot control this process. I don’t think this is always the last number, because I’m not sure if the fabric controller stops renaming instances after closing. Thus, even if it turns off IN_1, at the end of the process we will still have IN_0 and IN_1, for example, with the setting IN_0 and IN_2.

You can use the RoleEnvironment.Stopping event to handle the proper stop (clean shutdown) of your instance. This event occurs after the VM has been taken out of the rotation of the Load Balancer and before the OnStop Method of your called RoleEntryPoint class.

I'm not sure where I noticed this, but I know that there is a difficult time line in which you must complete the cleanup, that is, I think the instance will be turned off after 5 minutes of waiting for the OnStop or Stopping handler (I don’t remember exactly, but the fabrci controller will not wait long until you clean it).

+4
source

Usually this will be the last to be deployed. So you are IN_0 IN_1 and IN_3. I only ever saw IN_3 when you delete it so that it looks like that.

However, this is not documented anywhere by Microsoft, so it is not guaranteed that it goes down ... it seems, in practice.

+1
source

More articles:


All Articles