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https://issues.apache.org/jira/browse/NIFI-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16217527#comment-16217527
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Benjamin Garrett commented on NIFI-4523:
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Also it would be nice if Expression Language was enabled on the REGION
PropertyDescriptor as well.
> AWS S3 Processors should support arbitrary regions
> --------------------------------------------------
>
> Key: NIFI-4523
> URL: https://issues.apache.org/jira/browse/NIFI-4523
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Affects Versions: 1.4.0
> Reporter: Benjamin Garrett
> Priority: Minor
>
> Currently the ListS3 processor uses the REGION PropertyDescriptor defined in
> AbstractAWSProcessor. This uses ".allowableValues()" which forces the region
> names to come from a hard coded list. AWS does occasionally bring new
> regions online. Every time there is a new region then we have to either wait
> for a new nifi upgrade or else override the AbstractAWSProcessor (as well as
> the necessary child classes which extend it).
> It is simple enough to just let us type in arbitrary text into the S3
> processor. For example you could just comment out line 97 in
> AbstractAWSProcessor.
> //.allowableValues(getAvailableRegions())
> If you did this, typically you also have to add an appropriate validator,
> e.g.: .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
> A different approach would be to expand the Nifi framework to allow you to
> specify both ".allowableValues()" but also to allow someone to type in
> arbitrary text as well. From a UI perspective, you would show the user a
> choice list but then also make it editable so someone can type in arbitrary
> text. There have been other instances where I thought this feature would be
> useful. Maybe you would use a different method name instead of
> allowableValues, such as 'possibleValues()', and if you did this then that
> would be an indicator that the user gets an editable choice list (as opposed
> to an uneditable hard-coded choice list).
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