Defining Apache Avro Schema fullname in Apache NiFi - avro

Question

Using NiFi 1.7.1 (which uses Java Avro 1.8.1) and in the AvroSchemaRegistry, I'm trying to define a schema which has the fields name and app.name at the top level. According to the Avro docs[1] I would assume that I could just define the fullname like normal "name": "app.name" but I hit the error Illegal character in: app.name. It's true that the name portion of the fullname does not allow dots but according to the docs: "If the name specified contains a dot, then it is assumed to be a fullname..."
I then tried using the namespace field. Using the following schema:
{
"type": "record",
"name": "nameRecord",
"fields": [
{
"type": [
"string",
"null"
],
"name": "name"
},
{
"type": [
"string",
"null"
],
"namespace": "app",
"name": "name"
}
]
}
I hit this error: Duplicate field name in record nameRecord: name type:UNION pos:1 and name type:UNION pos:0
Ultimately, I'd like to be able to define a schema for record like this (in JSON):
{
"name": "Joe",
"app.name": "NiFi"
}
[1] https://avro.apache.org/docs/1.8.1/spec.html#names

Answer 1

According to the docs, namespaces are only supported for record, enum, and fixed types, and other fields must adhere to the "regular" naming conventions for which a period (.) is not a valid character.
However as of NiFi 1.5.0 (via NIFI-4612), you could specify the schema in an AvroSchemaRegistry, and set "Validate Field Names" to false. This should allow you to bypass the restriction of having a field's name be app.name.