NiFi failed to parse data in convert record - json

Question

I'm trying to convert JSON to CSV using the ConvertRecord processor but the only error I'm getting back is Could not parse incoming data. As this is not very descriptive, I'm at a loss as to how to diagnose the issue.
I know that my avro schema is valid because A) NiFi doesn't throw an error regarding the schema when I insert it into the Schema Registry and B) I tested my schema on here and it didn't give me an issue.
I also know that my JSON is valid because I can load it in Python using json.loads() and it doesn't give me any problems.
I'm just not quite sure where I've gone wrong, nor how to fix it.
JSON
{
"DOC": {
"DOCID": "1234",
"Subjects": {
"Subject_xref": ["2233"]
},
"TXT": {
"COUNTRY": ["United States"],
"ESTATE": ["Mount Vernon"],
"PERSON": ["George Washington"]
},
"RAW_TXT": "George Washington lived in his family home, Mount Vernon, located in the United States.",
"RELINFO": [
{"ID" : "REL-1234-100",
"RELTYPE" : "PER-PROP",
"PERID" : "PER-1234-009",
"PROPID" : "PROP-1234-001",
"SENTID" : "1234-SENT-001",
"PROP_NORM" : "Mount Vernon",
"PROP_MENTION" : "Mount Vernon",
"PER_NORM" : "George Washington",
"PER_MENTION" : "George Washington"}
],
"ENTINFO": [
{"ID": "PER-1234-009", "TYPE": "PERSON", "NORM": "George Washington", "REFID": "PER-1234-009", "MENTION": "George Washington"},
{"ID": "CTRY-1234-003", "TYPE": "COUNTRY", "NORM": "United States", "REFID": "CTRY-1234-003", "MENTION": "United States."},
{"ID": "PROP-1234-001", "TYPE": "ESTATE", "NORM": "Mount Vernon", "REFID": "PROP-1234-001", "MENTION": "Mount Vernon"}
]
}
}
Avro
{
"type": "record",
"namespace": "name.space",
"name": "nlp_output",
"fields": [
{"name": "DOC", "type": {
"name": "DOCDocument", "type": "record", "namespace": "doc.name.space", "fields": [
{"name": "DOCID", "type": ["long","null"], "default": null},
{"name": "Subjects", "type": {
"name": "Subjects", "type": "record", "namespace": "subjects.name.space", "fields": [
{"name": "SubjectIdentificationID", "aliases": ["Subject_xref"], "type": ["long","null"], "default": null}
]
}},
{"name": "TXT", "type": {
"name": "TXT", "type": "record", "namespace": "text.name.space", "fields": [
{"name": "COUNTRY", "type": {"type": "array", "items": ["string", "null"]}, "default": null, "doc": ""},
{"name": "ESTATE", "type": {"type": "array", "items": ["string", "null"]}, "default": null, "doc": ""},
{"name": "PERSON", "type": {"type": "array", "items": ["string", "null"]}, "default": null, "doc": ""}
]
}},
{"name": "RAW_TXT", "type": ["string","null"], "default": null},
{"name": "RELINFO", "type": {
"name": "RelatedEntities", "type": "record", "namespace": "relent.name.space", "fields": [
{"name": "ID", "type": ["string", "null"], "default": null},
{"name": "RELTYPE", "type": ["string", "null"], "default": null},
{"name": "PERID", "type": ["string", "null"], "default": null},
{"name": "PROPID", "type": ["string", "null"], "default": null},
{"name": "SENTID", "type": ["string", "null"], "default": null},
{"name": "PROP_NORM", "type": ["string", "null"], "default": null},
{"name": "PROP_MENTION", "type": ["string", "null"], "default": null},
{"name": "PER_NORM", "type": ["string", "null"], "default": null},
{"name": "PER_MENTION", "type": ["string", "null"], "default": null}
]
}},
{"name": "ENTINFO", "doc": "Sentences stripped of tags for ease of reading", "type": {
"name": "Entities", "type": "record", "namespace": "entities.name.space", "fields": [
{"name": "ID", "type": ["string", "null"], "default": null},
{"name": "TYPE", "type": ["string", "null"], "default": null},
{"name": "NORM", "type": ["string", "null"], "default": null},
{"name": "REFID", "type": ["string", "null"], "default": null},
{"name": "MENTION", "type": ["string", "null"], "default": null}
]
}}
]
}}
]
}

Answer 1

Your schema doesn't match your JSON. You have SubjectIdentificationID defined as long or null but in the JSON Subject_xref is an array.
{
"type": "record",
"namespace": "name.space",
"name": "nlp_output",
"fields": [
{"name": "DOC", "type": {
"name": "DOCDocument", "type": "record", "namespace": "doc.name.space", "fields": [
{"name": "DOCID", "type": ["long","null"], "default": null},
{"name": "Subjects", "type": {
"name": "Subjects", "type": "record", "namespace": "subjects.name.space", "fields": [
{"name": "SubjectIdentificationID", "aliases": ["Subject_xref"], "type": {"type": "array", "items": ["long", "null"]}, "default": null}
]
}},
{"name": "TXT", "type": {
"name": "TXT", "type": "record", "namespace": "text.name.space", "fields": [
{"name": "COUNTRY", "type": {"type": "array", "items": ["string", "null"]}, "default": null, "doc": ""},
{"name": "ESTATE", "type": {"type": "array", "items": ["string", "null"]}, "default": null, "doc": ""},
{"name": "PERSON", "type": {"type": "array", "items": ["string", "null"]}, "default": null, "doc": ""}
]
}},
{"name": "RAW_TXT", "type": ["string","null"], "default": null},
{"name": "RELINFO", "type": {
"name": "RelatedEntities", "type": "record", "namespace": "relent.name.space", "fields": [
{"name": "ID", "type": ["string", "null"], "default": null},
{"name": "RELTYPE", "type": ["string", "null"], "default": null},
{"name": "PERID", "type": ["string", "null"], "default": null},
{"name": "PROPID", "type": ["string", "null"], "default": null},
{"name": "SENTID", "type": ["string", "null"], "default": null},
{"name": "PROP_NORM", "type": ["string", "null"], "default": null},
{"name": "PROP_MENTION", "type": ["string", "null"], "default": null},
{"name": "PER_NORM", "type": ["string", "null"], "default": null},
{"name": "PER_MENTION", "type": ["string", "null"], "default": null}
]
}},
{"name": "ENTINFO", "doc": "Sentences stripped of tags for ease of reading", "type": {
"name": "Entities", "type": "record", "namespace": "entities.name.space", "fields": [
{"name": "ID", "type": ["string", "null"], "default": null},
{"name": "TYPE", "type": ["string", "null"], "default": null},
{"name": "NORM", "type": ["string", "null"], "default": null},
{"name": "REFID", "type": ["string", "null"], "default": null},
{"name": "MENTION", "type": ["string", "null"], "default": null}
]
}}
]
}}
]
}