[GitHub] [nifi] markap14 commented on a change in pull request #3725: NIFI-6558 Added Parameters to User Guide and Sys Admin Guide

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markap14 commented on a change in pull request #3725: NIFI-6558 Added Parameters to User Guide and Sys Admin Guide
URL: https://github.com/apache/nifi/pull/3725#discussion_r323895112
 
 

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 File path: nifi-docs/src/main/asciidoc/user-guide.adoc
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 @@ -711,15 +711,187 @@ whatever comments are appropriate for this component. Use of the Comments tab is
 image::comments-tab.png["Comments Tab"]
 
 
-=== Additional Help
+==== Additional Help
 
 You can access additional documentation about each Processor's usage by right-clicking on the Processor and selecting 'Usage' from the context menu. Alternatively, select Help from the Global Menu in the top-right corner of the UI to display a Help page with all of the documentation, including usage documentation for all the Processors that are available. Click on the desired Processor to view usage documentation.
 
+[[Parameters]]
+=== Parameters
+The values of properties in the flow, including sensitive properties, can be parameterized using Parameters. Parameters are created and configured within the NiFi UI. Any property can be configured to reference a Parameter with the following conditions:
+
+ - A sensitive property can only reference a Sensitive Parameter
+ - A non-sensitive property can only reference a non-Sensitive Parameter
+ - Properties that reference Controller Services can not use Parameters
+
+NOTE: NiFi automatically picks up new or modified parameters.
+
+[[parameter-contexts]]
+==== Parameter Contexts
+Parameters are created within Parameter Contexts. Parameter Contexts are globally defined/accessible to the NiFi instance. Access policies can be applied to Parameter Contexts to determine which users can create them. Once created, policies to read and write to a specific Parameter Context can also be applied (see <<accessing-parameters>> for more information).
+
+===== Creating a Parameter Context
+To create a Parameter Context, select Parameter Contexts from the Global Menu:
+
+image:parameter-contexts-selection.png["Global Menu - Parameter Contexts"]
+
+In the Parameter Contexts window, click the `+` button in the upper-right corner and the Add Parameter Context window opens. The window has two tabs: Settings and Parameters.
+
+image:parameter-contexts-settings.png["Parameter Contexts - Settings"]
+
+On the "Settings" tab, add a name for the Parameter Context and a description if desired.  Select "Apply" to save the Parameter Context or select the "Parameters" tab to add parameters to the context.
+
+==== Adding a Parameter to a Parameter Context
+Parameters can be added during Parameter Context creation or added to existing Parameter Contexts.
+
+During Parameter Context creation, select the "Parameters" tab. Click the `+` button to open the Add Parameter window.
+
+image:add-parameter-during-parameter-context-creation.png[Add Parameter]
+
+To add parameters to an existing Parameter Context, open the Parameter Context window and click the Edit button (image:iconEdit.png["Edit"]) in the row of the desired Parameter Context.
+
+image:edit-parameter-context.png[Edit Parameter Context]
+
+On the "Parameters" tab, click the `+` button to open the Add Parameter window.
+
+The Add Parameter window has the following settings:
+
+- *Name* - A name that is used to denote the Parameter. Only alpha-numeric characters (a-z, A-Z, 0-9), hyphens ( - ), underscores ( _ ), periods ( . ), and spaces are allowed.
+
+- *Value* - The value that will be used when the Parameter is referenced.
+
+- *Set empty string* - Check to explicity set the value of the Parameter to an empty string. Unchecked by default.
+
+- *Sensitive Value* -  Set to "Yes" if the Parameter's Value should be considered sensitive. If sensitive, the value of the Parameter will not be shown in the UI once applied. The default setting is "No".
 
 Review comment:
   It may make sense to reiterate here that sensitive parameters can only be referenced by sensitive properties and non-sensitive params by non-sensitive properties. It's also worth noting, I think, that once a Parameter is created, its sensitivity flag cannot be changed. The parameter would have to be deleted and recreated.

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