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https://issues.apache.org/jira/browse/NIFI-7572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Burgess reopened NIFI-7572:
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Reopening due to bug where the Jython script is not recompiled when the script
body changes
> Add a ScriptedTransformRecord processor
> ---------------------------------------
>
> Key: NIFI-7572
> URL: https://issues.apache.org/jira/browse/NIFI-7572
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
> Fix For: 1.12.0
>
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> NiFi has started to put a heavier emphasis on Record-oriented processors, as
> they provide many benefits including better performance and a better UX over
> their purely byte-oriented counterparts. It is common to see users wanting to
> transform a Record in some very specific way, but NiFi doesn't make this as
> easy as it should. There are methods using ExecuteScript,
> InvokedScriptedProcessor, ScriptedRecordWriter, and ScriptedRecordReader for
> instance.
> But each of these requires that the Script writer understand a lot about NiFi
> and how to expose properties, create Property Descriptors, etc. and for
> fairly simple transformation we end up with scripts where the logic takes
> fewer lines of code than the boilerplate.
> We should expose a Processor that allows a user to write a script that takes
> a Record and transforms that Record in some way. The processor should be
> configured with the following:
> * Record Reader (required)
> * Record Writer (required)
> * Script Language (required)
> * Script Body or Script File (one and only one of these required)
> The script should implement a single method along the lines of:
> {code:java}
> Record transform(Record input) throws Exception; {code}
> If the script returns null, the input Record should be dropped. Otherwise,
> whatever Record is returned should be written to the Record Writer.
> The processor should have two relationships: "success" and "failure."
> The script should not be allowed to expose any properties or define any
> relationships. The point is to keep the script focused purely on processing
> the record itself.
> It's not entirely clear to me how easy the Record API works with some of the
> scripting languages. The Record object does expose a method named toMap()
> that returns a Map<String, Object> containing the underlying key/value pairs.
> However, the values in that Map may themselves be Records. It might make
> sense to expose a new method toNormalizedMap() or something along those lines
> that would return a Map<String, Object> where the values have been
> recursively normalized, in much the same way that we do for
> JoltTransformRecord. This would perhaps allow for cleaner syntax, but I'm not
> a scripting expert so I can't say for sure whether such a method is necessary.
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