Re: How to change the record name of avro schema

Posted by Youngwoo Kim (김영우) on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/How-to-change-the-record-name-of-avro-schema-tp43751p43785.html

Arvid,

I found a jira related to my issue. https://issues.apache.org/jira/browse/FLINK-18096

Added a comment and I think Seth's idea is way better than just renaming the current name of the record from avro schema.

Thanks,

Youngwoo

On Mon, May 17, 2021 at 8:37 PM Youngwoo Kim (김영우) <[hidden email]> wrote:

Hey Arvid,

I found that It's a constant from Flink. https://github.com/apache/flink/blob/master/flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/typeutils/AvroSchemaConverter.java#L307

I believe, it would be good to substitute 'record' to 'Record'

What do you think?

Thanks,

Youngwoo

On Mon, May 17, 2021 at 8:10 PM Arvid Heise <[hidden email]> wrote:

Hi Youngwoo,

You can try to use aliases for it [1].

Even better would be to use a different name for the record. In general, since Avro originally comes from the Java World, it's more common to use camel case for record names.

[1] https://avro.apache.org/docs/current/spec.html#Aliases

On Mon, May 17, 2021 at 11:29 AM Youngwoo Kim (김영우) <[hidden email]> wrote:

Hi,

I have a table backed by confluent avro format and the generated schema from flink looks like following:

{

  "type": "record",

  "name": "record",

  "fields": [

    {

      "name": "dt",

      "type": [

        "null",

        {

          "type": "int",

          "logicalType": "date"

        }

      ],

      "default": null

    },

(snip)

}

At this moment, I have another application that reads avro schema from schema registry. Unfortunately, Got a traceback from the application:

Traceback (most recent call last):

  File "/usr/local/bin/datahub", line 8, in <module>

    sys.exit(datahub())

  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 829, in __call__

    return self.main(*args, **kwargs)

  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 782, in main

    rv = self.invoke(ctx)

  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 1259, in invoke

    return _process_result(sub_ctx.command.invoke(sub_ctx))

  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 1066, in invoke

    return ctx.invoke(self.callback, **ctx.params)

  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 610, in invoke

    return callback(*args, **kwargs)

  File "/usr/local/lib/python3.8/site-packages/datahub/entrypoints.py", line 74, in ingest

    pipeline.run()

  File "/usr/local/lib/python3.8/site-packages/datahub/ingestion/run/pipeline.py", line 108, in run

    for wu in self.source.get_workunits():

  File "/usr/local/lib/python3.8/site-packages/datahub/ingestion/source/kafka.py", line 79, in get_workunits

    mce = self._extract_record(t)

  File "/usr/local/lib/python3.8/site-packages/datahub/ingestion/source/kafka.py", line 112, in _extract_record

    fields = schema_util.avro_schema_to_mce_fields(schema.schema_str)

  File "/usr/local/lib/python3.8/site-packages/datahub/ingestion/extractor/schema_util.py", line 117, in avro_schema_to_mce_fields

    parsed_schema: avro.schema.Schema = schema_parse_fn(avro_schema_string)

  File "/usr/local/lib/python3.8/site-packages/avro/schema.py", line 1244, in parse

    return SchemaFromJSONData(json_data, names)

  File "/usr/local/lib/python3.8/site-packages/avro/schema.py", line 1215, in SchemaFromJSONData

    return parser(json_data, names=names)

  File "/usr/local/lib/python3.8/site-packages/avro/schema.py", line 1136, in _SchemaFromJSONObject

    return RecordSchema(

  File "/usr/local/lib/python3.8/site-packages/avro/schema.py", line 1003, in __init__

    super(RecordSchema, self).__init__(

  File "/usr/local/lib/python3.8/site-packages/avro/schema.py", line 440, in __init__

    names.Register(self)

  File "/usr/local/lib/python3.8/site-packages/avro/schema.py", line 399, in Register

    raise SchemaParseException(

avro.schema.SchemaParseException: record is a reserved type name.

Full name of schema's record is `"name": "record",` but the `record` is one of avro complex type. See https://github.com/apache/avro/blob/master/lang/py3/avro/schema.py#L399

So, I wonder if I can set or change the name of avro record to avoid this parse exception.

Thanks,

Youngwoo