Jesse,
The record names should match (although Java has been loose about
enforcement of that).
Also, that should be "aliases", not "alias".
What happens if you add:
"aliases": ["SimpleCard"]
to the second schema, and change the field alias to:
"aliases": ["suit"]
?
Alternately, you could just leave the name of the record alone, as
"SimpleCard" in both cases.
Does that help?
Thanks,
Doug
On Fri, Oct 12, 2018 at 11:16 AM Jesse Anderson <je...@bigdatainstitute.io>
wrote:
> I'm hitting an issue with using an alias. When I do the schema evolution,
> I get an exception with "missing required field." As far I know, this
> should be a viable schema. Is there something I'm missing?
>
> Here is the version 1 of the schema:
>
> {
> "namespace": "model",
> "type": "record",
> "name": "SimpleCard",
> "fields": [
> {
> "name": "suit",
> "type": "string",
> "doc" : "The suit of the card"
> }
> ]
> }
>
> Here is version 2 of the schema. The changes are a different record name
> and I've aliased the suit/cardsuit field.
>
> {
> "namespace": "model",
> "type": "record",
> "name": "SimpleCardV2",
> "fields": [
> {
> "name": "cardsuit",
> "type": "string",
> "doc" : "The suit of the card",
> "alias": ["suit"]
> }
> ]
> }
>
> Here is the stack trace of the error:
>
> org.apache.avro.AvroTypeException: Found model.SimpleCard, expecting
> model.SimpleCardV2, missing required field cardsuit
> at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:292)
> at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
> at
> org.apache.avro.io.ResolvingDecoder.readFieldOrder(ResolvingDecoder.java:130)
> at
> org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:215)
> at
> org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:175)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:145)
> at helpers.AvroReaderHelper.getObject(AvroReaderHelper.java:56)
>
> Thanks,
>
> Jesse
>
