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https://issues.apache.org/jira/browse/NIFI-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15330147#comment-15330147
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ASF GitHub Bot commented on NIFI-1974:
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Github user YolandaMDavis commented on the issue:
https://github.com/apache/nifi/pull/501
Per my discussion with @markap14 having ControllerServiceLookup extend
VariableRegistry interface did not fit in with the overall purpose of the
ControllerServiceLookup interface. Also in some cases service lookups are not
required objects, so passing the variable registry directly is optimal.
> Support Custom Properties in Expression Language
> ------------------------------------------------
>
> Key: NIFI-1974
> URL: https://issues.apache.org/jira/browse/NIFI-1974
> Project: Apache NiFi
> Issue Type: New Feature
> Reporter: Yolanda M. Davis
> Assignee: Yolanda M. Davis
> Fix For: 1.0.0, 0.7.0
>
>
> Add a property in "nifi.properties" config file to allows users to specify a
> list of custom properties files (containing data such as environmental
> specific values, or sensitive values, etc.). The key/value pairs should be
> loaded upon NIFI startup and availbale to processors for use in expression
> languages.
> Optimally this will lay the groundwork for a UI driven Variable Registry.
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