The Service Stack (or simply the Stack) is a coordinated and tested set of Hadoop components. Use the radio button to select the Stack version you want to install. To install a Hadoop 1 stack, select HDP 1.3.3, in Stacks.
Under Advanced Repository Options, you can specify the Base URLs of your local repositories for each Operating System you plan to use in your cluster. You should have configured the Base URLs for your local repositories in Optional: Configure Ambari for Local Repositories.
