[AMBARI-3644] App.ServiceConfig needs 'defaultsProvider' mechanism

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.4.2
• Fix Version/s: 1.4.2
• Component/s: ambari-web
• Assignee: Oleg Nechiporenko
• Reporter: Oleg Nechiporenko
• Created: 31/Oct/13 19:54
• Updated: 01/Nov/13 10:16
• Resolved: 01/Nov/13 10:16

Description

App.ServiceConfig needs to have a 'defaultsProvider' property, which will give an object extending App.DefaultsProvider class. App.DefaultsProvider class will have a method 'getDefaults(App.ServiceConfigProperty[])'. This 'defaultsProvider' will be set via data/service_configs.js only for YARN service.

App.YARNDefaultsProvider will look at cluster setup, the provided properties, and provide an object where keys are property-names, and values are the recommended defaults.

These defaults will then be used during cluster install as default values.