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To customize categories and ordering of configurations in UI, the following files have to be updated.
Create Category -  Update the ambari-web/app/models/stack_service.js file to add your own service, along with your new categories.
Use Category - To place configs inside  a defined category, and specify an order in which configs are placed, add configs to ambari-web/app/data/HDP2/site_properties.js file. In this file one can specify the category to use, and the index where a config should be placed. The stack folders in ambari-web/app/data are hierarchical and inherit from previous versions. The mapping of configurations into sections is defined here. Example Hive Categories, Tez Categories.

UI - Enhanced Configs

The Enhanced Configs feature makes it possible for service providers to customize their service's configs to a great deal and determine which configs are prominently shown to user without making any UI code changes. Customization includes providing a service friendly layout, better controls (sliders, combos, lists, toggles, spinners, etc.), better validation (minimum, maximum, enums), automatic unit conversion (MB, GB, seconds, milliseconds, etc.), configuration dependencies and improved dynamic recommendations of default values.

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