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https://issues.apache.org/jira/browse/NIFI-4798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16343800#comment-16343800
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Mark Bean commented on NIFI-4798:
---------------------------------
This exact use case may be a holdover from long ago when removing an attribute
was not an option. And, to do so now first requires identifying all downstream
flows/customers and verifying there will be no adverse affects. In the end,
this is probably a good idea.
Having said that, I believe this ticket is still valid. While there are many
ways to achieve the same goal, the 'Set empty string' checkbox should still be
one of the options available.
> UpdateAttribute should allow empty string values without requiring state
> management
> -----------------------------------------------------------------------------------
>
> Key: NIFI-4798
> URL: https://issues.apache.org/jira/browse/NIFI-4798
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework, Extensions
> Affects Versions: 1.5.0
> Reporter: Mark Bean
> Priority: Minor
> Labels: easyfix
>
> The conditional validation of dynamic properties in UpdateAttribute use the
> NON_EMPTY_STRING validator when state management is not enabled. This prevent
> the "Set empty string" checkbox option. The introduction of state management
> to this processor changed this behavior which previously allowed an empty
> string for an attribute value. The validator for the non-stateful case should
> be changed to return the original behavior.
>
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