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https://issues.apache.org/jira/browse/FLINK-24544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17431204#comment-17431204
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Peter Schrott edited comment on FLINK-24544 at 10/20/21, 1:36 PM:
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The underlying problem with deserialization of records with enums form Kafka &
schema registry lies in the initialization of {{GenericDatumReader}}:
*Case Kafka & SR:*
In {{AvroDeserializationSchema.java}} the {{GenericDatumReader}} is initialized
with {{writerSchema = null}} and {{readerSchema = the schma gained from table
ddl}}
-> When calling {{RegistryAvroDeserializationSchema.deserialize(.)}}
{{datumReader.setSchema()}} sets the attribute {{actual}} is set to the actual
avro schema, whereas {{expected}} is already set to {{readerSchema}}
-> The inequality of {{actual}} and {{expected}} causes the exception on
serializing as type of {{actual}} and {{expected}} do not match
--> Root of this is: the initialization of {{DeserializationSchema}} in
{{RegistryAvroFormatFactory.java}} uses the {{rowType}} &&
{{ConfluentRegistryAvroDeserializationSchema.forGeneric(.)}} when creating the
{{ConfluentRegistryAvroDeserializationSchema}}
*Case FS:*
In {{AvroInputFormat.java}} the {{GenericDatumReader}} is initialized with
{{writerSchema = null}} and {{readerSchema = null}}
-> This leads in initialization of {{DataFileStream}}, where
{{reader.getSchema(.)}} is called with the actual avro, to the fact that in the
{{GenericDatumReader}} attribute {{expected}} and {{actual}} is set to the
passed value
-> The avro schema is taken from file
-> The equality of {{actual}} and {{expected}} leads to the fact that
serialized data can be read from file
was (Author: peter.schrott):
The underlying problem with deserialization of records with enums form Kafka &
schema registry lies in the initialization of \{{GenericDatumReader}}:
Case Kafka & SR:
In \{{AvroDeserializationSchema.java}} the \{{GenericDatumReader}} is
initialized with \{{writerSchema = null}} and \{{readerSchema = the schma
gained from table ddl}}
-> When calling \{{RegistryAvroDeserializationSchema.deserialize(.)}}
\{{datumReader.setSchema()}} sets the attribute \{{actual}} is set to the
actual avro schema, whereas \{{expected}} is already set to \{{readerSchema}}
-> The inequality of \{{actual}} and \{{expected}} causes the exception on
serializing as type of \{{actual}} and \{{expected}} do not match
--> Root of this is: the initialization of \{{DeserializationSchema}} in
\{{RegistryAvroFormatFactory.java}} uses the \{{rowType}} &&
\{{ConfluentRegistryAvroDeserializationSchema.forGeneric(.)}} when creating the
\{{ConfluentRegistryAvroDeserializationSchema}}
Case FS:
In \{{AvroInputFormat.java}} the \{{GenericDatumReader}} is initialized with
\{{writerSchema = null}} and \{{readerSchema = null}}
-> This leads in initialization of \{{DataFileStream}}, where
\{{reader.getSchema(.)}} is called with the actual avro, to the fact that in
the \{{GenericDatumReader}} attribute \{{expected}} and \{{actual}} is set to
the passed value
-> The avro schema is taken from file
-> The equality of \{{actual}} and \{{expected}} leads to the fact that
serialized data can be read from file
> Failure when using Kafka connector in Table API with Avro and Confluent
> schema registry
> ----------------------------------------------------------------------------------------
>
> Key: FLINK-24544
> URL: https://issues.apache.org/jira/browse/FLINK-24544
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka, Formats (JSON, Avro, Parquet, ORC,
> SequenceFile), Table SQL / Ecosystem
> Affects Versions: 1.13.1
> Reporter: Francesco Guardiani
> Priority: Major
> Attachments: flink-deser-avro-enum.zip
>
>
> A user reported in the [mailing
> list|https://lists.apache.org/thread.html/re38a07f6121cc580737a20c11574719cfe554e58d99817f79db9bb4a%40%3Cuser.flink.apache.org%3E]
> that Avro deserialization fails when using Kafka, Avro and Confluent Schema
> Registry:
> {code:java}
> Caused by: java.io.IOException: Failed to deserialize Avro record.
> at
> org.apache.flink.formats.avro.AvroRowDataDeserializationSchema.deserialize(AvroRowDataDeserializationSchema.java:106)
> at
> org.apache.flink.formats.avro.AvroRowDataDeserializationSchema.deserialize(AvroRowDataDeserializationSchema.java:46)
>
> at
> org.apache.flink.api.common.serialization.DeserializationSchema.deserialize(DeserializationSchema.java:82)
> at
> org.apache.flink.streaming.connectors.kafka.table.DynamicKafkaDeserializationSchema.deserialize(DynamicKafkaDeserializationSchema.java:113)
> at
> org.apache.flink.streaming.connectors.kafka.internals.KafkaFetcher.partitionConsumerRecordsHandler(KafkaFetcher.java:179)
>
> at
> org.apache.flink.streaming.connectors.kafka.internals.KafkaFetcher.runFetchLoop(KafkaFetcher.java:142)
> at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:826)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:110)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:66)
> at
> org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:269)
> Caused by: org.apache.avro.AvroTypeException: Found my.type.avro.MyEnumType,
> expecting union
> at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:308)
> at org.apache.avro.io.parsing.Parser.advance(Parser.java:86)
> at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:275)
> at
> org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:187)
> at
> org.apache.avro.generic.GenericDatumReader.readArray(GenericDatumReader.java:298)
> at
> org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:183)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:160)
> at
> org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:187)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:160)
> at
> org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:259)
> at
> org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:247)
> at
> org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:179)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:160)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
> at
> org.apache.flink.formats.avro.RegistryAvroDeserializationSchema.deserialize(RegistryAvroDeserializationSchema.java:81)
> at
> org.apache.flink.formats.avro.AvroRowDataDeserializationSchema.deserialize(AvroRowDataDeserializationSchema.java:103)
> ... 9 more
> {code}
> Look in the attachments for a reproducer.
> Same data serialized to a file works fine (look the filesystem example in the
> reproducer)
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