我是Scala和Avro的新手,我只想尝试序列化case class
case class MyRecord(my_number: Int)
这应该不容易......
def serializeSubmapRecord(record: MyRecord): Array[Byte] = {
val out = new ByteArrayOutputStream()
val encoder = EncoderFactory.get.binaryEncoder(out, null)
val writer = new GenericDatumWriter[MyRecord](avro_schema)
writer.write(record, encoder)
encoder.flush
out.close
out.toByteArray
}
我获取avro_schema
为
val avro_my_schema = scala.io.Source.fromFile("my_schema.avsc").mkString
val avro_schema = new Parser().parse(avro_my_schema)
它编译但是在执行时我有
[error] (run-main-0) java.lang.ClassCastException: Submap cannot be cast to org.apache.avro.generic.IndexedRecord
java.lang.ClassCastException: Submap cannot be cast to org.apache.avro.generic.IndexedRecord
at org.apache.avro.generic.GenericData.getField(GenericData.java:666)
at org.apache.avro.generic.GenericData.getField(GenericData.java:681)
at org.apache.avro.generic.GenericDatumWriter.writeField(GenericDatumWriter.java:151)
at org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:143)
at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:105)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:73)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:60)
...
Avro架构(my_schema.avsc
)是
{"namespace": "",
"type": "record",
"name": "MyRecord",
"fields": [
{"name": "my_number", "type": "int"}
]
}
非常感谢任何帮助。