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https://issues.apache.org/jira/browse/AMBARI-1270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13565645#comment-13565645
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Tom Beerbower commented on AMBARI-1270:
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Category count is somewhat more complicated and requires something beyond just
a simple predicate object. An isEmpty predicate is all that is required to
meet the above objective.
> Add predicate objects for checking empty resource category & category count
> ----------------------------------------------------------------------------
>
> Key: AMBARI-1270
> URL: https://issues.apache.org/jira/browse/AMBARI-1270
> Project: Ambari
> Issue Type: Bug
> Reporter: Tom Beerbower
> Assignee: Tom Beerbower
> Attachments: AMBARI-1270.patch
>
>
> We need to be able to check through the API to see if a property category
> contains any properties.
> For example, if we want to check to see if configurations have been
> overridden then we can look at the ServiceInfo/desired_configs of a component
> resource. If desired_configs is empty then there are no config overrides.
> Through the API, we can examine the ServiceInfo/desired_configs property but
> we have no way to write a predicate that would allow us to query for
> components that contain config overrides.
> In order to allow for such a query, we need the underlying predicate objects.
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