PureLive (and perhaps other modes) don't work OOTB with Load Balancing

[Shazwazza]

The problem is because MB writes files to app_data and when LB on Azure or on a centralized file system multiple web nodes will be trying to write to the same location. These MB files should be stored by machinename + appdomainappid just like Umbraco does with the lastsynced.txt file.

[gdovicak]

This explains why I see recompilations in a load balanced environment when jumping to a new server. We served content much more quickly with 1 server than with two or three.

[zpqrtbnk]

See also [#131] - must move from ~/App_Data/Models to ~/App_Data/<machine>/Models. For some files only. It's OK that each server generates its own files and models, but we still need to read the partial code, etc from one unique location common to all servers. This means we need to refactor the generator to read the partial files in one location, and write in another.

So, all in all, we need to refactor the entire file layout.

As for modes other than PureLive I am not sure they are impacted. Of course multiple servers would write to the same (shared) directory, but the other modes require a user action to do anything, and I don't think that users would start re-creating models "live" on a LB environment.