[jira] [Created] (NIFI-8661) Update Record Reader/Writer lookup services to not require specific attributes exist

["Mark Payne (Jira)" <ji...@apache.org>]

Mark Payne created NIFI-8661:
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             Summary: Update Record Reader/Writer lookup services to not require specific attributes exist
                 Key: NIFI-8661
                 URL: https://issues.apache.org/jira/browse/NIFI-8661
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Extensions
            Reporter: Mark Payne
            Assignee: Mark Payne


NIFI-5829 introduced a ReaderLookup service and a RecordSetWriterLookup service. However, these services make the assumption that the reader/writer to use exists on an attribute of the flowfile such as {{recordreader.name}}. This means that these services are not applicable for many situations, especially for source processors.

A more convenient way would be to just add a property to these services indicating the name of the service to use, instead of expecting that an attribute with that name exists. We can set the default value of the property to `${recordreader.name}` etc. in order to maintain backward compatibility.

But this gives us the flexibility, for example, to use this in ConsumeKafkaRecord where kafka message headers are available in Expression Language and also gives us the ability to use a parameter for specifying the data format to use.



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