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https://issues.apache.org/jira/browse/NIFI-6241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17408889#comment-17408889
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John Wise commented on NIFI-6241:
---------------------------------
[~dsargrad] - I'm not sure if you've figured this out in the interim, but the
JsonRecordSetWriter has a "Schema Write Strategy" property which can be set to
"Set 'avro.schema' Attribute". The writer will then write the inferred schema
into that attribute. We use that regularly for new or problematic datasets to
create or debug conversions.
> ConvertRecord Schema Inference fails to infer complete schema, or simply fails
> ------------------------------------------------------------------------------
>
> Key: NIFI-6241
> URL: https://issues.apache.org/jira/browse/NIFI-6241
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.9.2
> Reporter: David Sargrad
> Priority: Major
> Attachments: Reproduce_ConvertRecord_Shortcoming.xml,
> image-2019-04-24-13-38-16-605.png, image-2019-04-24-13-39-36-327.png,
> image-2019-04-24-13-41-00-704.png, image-2019-04-24-13-41-26-860.png,
> image-2019-04-24-13-43-28-531.png, image-2019-04-24-13-43-59-706.png,
> image-2019-04-24-17-03-10-728.png, image-2019-04-25-09-13-52-416.png,
> image-2019-04-25-09-19-15-406.png, image-2019-04-25-09-30-08-297.png,
> image-2019-05-20-09-01-02-488.png
>
>
> I've got a simple test flow as depicted below:
>
>
> !image-2019-04-24-13-38-16-605.png!
>
> The input XML is:
> !image-2019-04-24-13-41-26-860.png!
>
> The output JSON is almost correct, yet it is missing two critical fields
> (they both show up as "null". The null fields are
> {color:#ff0000}position{color} and {color:#ff0000}ncsmTrackData{color}. It is
> also missing all of the attributes on fltdMessage.
>
> !image-2019-04-24-13-41-00-704.png!
>
> The configuration of my ConvertRecord is:
> !image-2019-04-24-13-43-28-531.png!
>
> My XMLReader configuration is:
> !image-2019-04-24-13-43-59-706.png!
>
> Questions:
> # Why are these two fields null?
> # Why are all the fltdMessage attributes being ignored?
> It would seem that this is a bug, or at least a major shortcoming, in the
> schema inference capability. If there were a way for me to view the inferred
> schema, then I could use that as a starting point. However its not clear from
> the documentation how to view that schema.
>
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