Protocol buffers 将protobuf转换为avro

我将数据序列化为protobuff格式，并希望将其转换为Avro序列化

我可以使用

    ProtoTest.Msg msg = buildMessage();
    ProtobufData protobufData = ProtobufData.get();
    Schema protoSchema = protobufData.getSchema(ProtoTest.Msg.class);
    Object o = protobufData.newRecord(msg, protoSchema);

生成的o再次是protobuf对象。现在我想用相同的模式将o写成avro

    GenericDatumWriter genericDatumWriter = new GenericDatumWriter(protoSchema);
    OutputStream out = new ByteArrayOutputStream();
    Encoder encoder = EncoderFactory.get().binaryEncoder(out, null );
    genericDatumWriter.write(o, encoder);

但是运行上面的代码会在write方法中引发下一个异常

如何将原始对象转换为avro对象

问候,，

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Ronen.

您应该使用ProtobufDatumWriter而不是GenericDatumWriter

另外，使用ProtobufDatumReader读取protobuf数据

最后，Avro的邮件列表会更及时地回答Avro的问题

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嗨，罗南，你找到克服这个问题的方法了吗？我也有同样的经历。

java.lang.ClassCastException: example.avro.ProtoTest$Msg cannot be cast to org.apache.avro.generic.IndexedRecord
at org.apache.avro.generic.GenericData.getField(GenericData.java:526)
at org.apache.avro.generic.GenericData.getField(GenericData.java:541)
at org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:104)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:66)
at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:58)
at hermes.mediationOrchestrator.AvroFileWriteTest.testWriter3(AvroFileWriteTest.java:115)