Make the AbstractKafkaAvroSerDe Serializable

[Fokko]

For our Flink job the SchemaRegistryClient is part of a task, and we would like to be able to Serialize this class and send it to the TaskManagers.

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[Fokko]

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[abij]

He @Fokko, running into same issue.

I solved this part, but the CachedSchemaRegistryClient is not Serializable, so i'm unable to serialize the task. For Spark in my case. Trying to follow the guide: https://github.com/xebia-france/spark-structured-streaming-blog/blob/master/src/main/scala/AvroConsumer.scala.

class MyAvroDeserializer extends AbstractKafkaAvroDeserializer with Serializable {
  def this(client: SchemaRegistryClient) {
    this()
    this.schemaRegistry = client
  }

  override def deserialize(bytes: Array[Byte]): String = {
    val genericRecord = super.deserialize(bytes).asInstanceOf[GenericRecord]
    genericRecord.toString
  }
}

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