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Why KafkaAvroDeserializer is retrieving schema based on both subject and ID? #3748

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@Karthik-Rangasamy

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@Karthik-Rangasamy

As per #1692 ,
KafkaAvroDeserializer uses Subject and ID to fetch the schema.
Why Subject is considered, is ID not enough for the deserializer?

`
Caused by: org.apache.kafka.common.errors.SerializationException: Error retrieving Avro value schema version for id 73
at io.confluent.kafka.serializers.AbstractKafkaSchemaSerDe.toKafkaException(AbstractKafkaSchemaSerDe.java:253)
at io.confluent.kafka.serializers.AbstractKafkaAvroDeserializer.deserializeWithSchemaAndVersion(AbstractKafkaAvroDeserializer.java:225)
at io.confluent.connect.avro.AvroConverter$Deserializer.deserialize(AvroConverter.java:172)
at io.confluent.connect.avro.AvroConverter.toConnectData(AvroConverter.java:107)
... 18 more

Caused by: io.confluent.kafka.schemaregistry.client.rest.exceptions.RestClientException: Subject 'error-value' not found.; error code: 40401
at io.confluent.kafka.schemaregistry.client.rest.RestService.sendHttpRequest(RestService.java:314)
at io.confluent.kafka.schemaregistry.client.rest.RestService.httpRequest(RestService.java:384)
at io.confluent.kafka.schemaregistry.client.rest.RestService.lookUpSubjectVersion(RestService.java:475)
at io.confluent.kafka.schemaregistry.client.rest.RestService.lookUpSubjectVersion(RestService.java:460)
at io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient.getVersionFromRegistry(CachedSchemaRegistryClient.java:331)
at io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient.getVersion(CachedSchemaRegistryClient.java:523)
at io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient.getVersion(CachedSchemaRegistryClient.java:503)
at io.confluent.kafka.serializers.AbstractKafkaAvroDeserializer.schemaVersion(AbstractKafkaAvroDeserializer.java:166)
at io.confluent.kafka.serializers.AbstractKafkaAvroDeserializer.deserializeWithSchemaAndVersion(AbstractKafkaAvroDeserializer.java:207)
`

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