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https://issues.apache.org/jira/browse/AVRO-3118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17347254#comment-17347254
]
Michael A. Smith commented on AVRO-3118:
----------------------------------------
My Java is not strong, but I was able to read the schema in without error using
the java tools:
{code:sh}
$ cd lang/java
$ pbpaste | jq -c | tee schema.json # pbpaste is macos-specific paste from
clipboard
{"type":"record","name":"my_schema","namespace":"my_ns","fields":[{"name":"field_a","type":{"type":"record","name":"row","namespace":"","fields":[{"name":"subfield","type":"string"}]}},{"name":"field_b","type":"row"}]}
$ ./build.sh dist
…
$ java -jar tools/target/avro-tools-1.11.0-SNAPSHOT.jar random --count 1
--schema-file schema.json - | java -jar
tools/target/avro-tools-1.11.0-SNAPSHOT.jar tojson - | jq -r .
{
"field_a": {
"subfield": "uvqklmwumlywpfjfnijmahjhsbdlcvucfd"
},
"field_b": {
"subfield": "jlhyhqrbwjfojdapwripscvsglvuvkjmkxumag"
}
}
{code}
So Java accepts this schema, at least.
> Namespace with empty string is not treated as null in Python API
> ----------------------------------------------------------------
>
> Key: AVRO-3118
> URL: https://issues.apache.org/jira/browse/AVRO-3118
> Project: Apache Avro
> Issue Type: Bug
> Components: python
> Affects Versions: 1.10.2
> Reporter: Frank Mieves
> Assignee: Michael A. Smith
> Priority: Blocker
>
> Hi,
> based on [the AVRO
> documentation|https://avro.apache.org/docs/current/spec.html#names] an empty
> string may also be used as a namespace to indicate the null namespace.
> The Python package doesn't do that. Following example will fail when parsing:
> {code:python}
> import avro.schema
> schema_str="""
> {"type": "record", "name": "my_schema", "namespace": "my_ns",
> "fields": [{"name": "field_a", "type": {"type": "record", "name": "row",
> "namespace": "",
> "fields": [{"name": "subfield", "type": "string"}]}},
> {"name": "field_b", "type": "row"}
> ]}
> """
> schema = avro.schema.parse(schema_str)
> {code}
> Raised exception is "SchemaParseException: Type property "row" not a valid
> Avro schema: Could not make an Avro Schema object from row."
> If I set the namespace in the in the subfield to null it's working.
> Problem for me is, that I can't change the schema definition. The schema is
> in the Kafka schema repository. The Kafka AVRO consumer receives this from
> the schema registry server with an empty string.
> I could fix this by adding a check in the parser source schema.py:
>
> {code:python}
> ...
> return writer.type == self.type and (self.type == 'request' or
> self.check_props(writer, ['fullname']))
> def __init__(self, name, namespace, fields, names=None, schema_type='record',
> doc=None, other_props=None):
> # Fixing empty namespace
> if namespace == '':
> namespace = None
>
> # Ensure valid ctor args
> if fields is None:
> ...
> {code}
>
>
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