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https://issues.apache.org/jira/browse/AMBARI-11216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14548107#comment-14548107
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Andrii Babiichuk commented on AMBARI-11216:
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https://reviews.apache.org/r/34356/
> Refactor service-config 'defaultValue' property into 'savedValue' and
> 'recommendedValue'
> ----------------------------------------------------------------------------------------
>
> Key: AMBARI-11216
> URL: https://issues.apache.org/jira/browse/AMBARI-11216
> Project: Ambari
> Issue Type: Bug
> Components: ambari-web
> Affects Versions: 2.1.0
> Reporter: Andrii Babiichuk
> Assignee: Andrii Babiichuk
> Priority: Critical
> Fix For: 2.1.0
>
> Attachments: AMBARI-11216.patch
>
>
> {{App.ServiceConfigProperty}} class has this property called {{defaultValue}}
> which is overloaded and confusing. We want to refactor it into distinct
> properties called {{savedValue}} and {{recommendedValue}}.
> *Background*
> Originally this property represented the default value provided by the
> {{/api/v1/stacks}} endpoint so that when installing cluster the {{value}}
> could be accurately populated. Later to support the _Undo_ action we put the
> values saved in {{/api/v1/clusters/c1/configurations}} into the same
> {{defaultValue}} property. So if {{/api/v1/stacks}} had value '1', and user
> saved '2', then {{defaultValue}} would become '2'. If ever {{value}} differed
> from {{defaultValue}}, then _Undo_ action and other logics would trigger.
> *Problem*
> With the increasing usage of {{/recommendations}} endpoint for config's
> dynamic values and value-attributes, the {{defaultValue}} is getting complex
> to understand and comprehend. We generally tend to update {{defaultValue}}
> whenever {{value}} is updated - which is hard to explain. For example in the
> add-service wizard we [suppress any updates to
> core-site.xml|https://github.com/apache/ambari/blob/trunk/ambari-web/app/controllers/wizard/step8_controller.js#L864]
> because we cannot tell when core-site.xml configs were changed from what is
> saved on server.
> *Proposal*
> Each config should have 3 values, as they are 3 different entities:
> # {{value}} - Represents the value shown in UI only to the user
> # {{savedValue}} - Represents the value saved in Ambari DB in
> {{/api/v1/clusters/c1/configurations}}. Should only be set when loading
> configs from API.
> # {{recommendedValue}} - Represents the value either provided by
> {{/api/v1/stacks}} or by {{/recommendations}}.
> This will cleanly differentiate the purpose of each variable. This will have
> an effect on the logic used like {{#isNotDefaultValue}} and
> {{#isOverrideChanged}} etc.
> Undo action should be whenever {{value}} != {{savedValue}}.
> Set recommended action should be whenever {{value}} != {{recommendedValue}}
> Add-service wizard should basically save only those config-types which have
> {{value}} != {{savedValue}} etc.
> The change might be as simple as renaming {{defaultValue}} to {{savedValue}},
> but the semantics will be clearer to understand and code.
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