Azret Botash announces that the Reporting Service underwent a big revision to address the way it manages report objects on the server and explains the problem in details.
Source: DevExpress
We start off by requesting a particular report to be build. Than, until we get the build completion status we start requesting the pages. The problem is, where should the printing service store the report objects during the report fetching process? In the original implementation, we stored them in the ASP.NET Session. This approach, as we discovered, has serious limitations.