Benjamin Garrett created NIFI-4523:
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Summary: 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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