使用Hortonworks Schema Registry读取Java应用程序中的Avro文件

Question

我有一个正在以Avro格式(每个文件多个记录)写入文件的应用程序，但我无法在另一个Java应用程序中读取它。以下是我尝试过的方法

Map<String, Object> registryConfig = new HashMap<>();
registryConfig.put("schema.registry.client.class.loader.cache.size", 10L);
registryConfig.put("schema.registry.url", "http://localhost:9090/api/v1");
registryConfig.put("schema.registry.client.class.loader.cache.expiry.interval.secs", 10L);
registryConfig.put("schema.registry.deserializer.schema.cache.size", 10L);
registryConfig.put("schema.registry.client.schema.metadata.cache.size", 10L);
registryConfig.put("schema.registry.client.schema.text.cache.expiry.interval.secs", 10000L);
registryConfig.put("schema.registry.client.schema.version.cache.expiry.interval.secs", 10000L);
registryConfig.put("schema.registry.client.schema.metadata.cache.expiry.interval.secs", 10L);
registryConfig.put("specific.avro.reader", false);
registryConfig.put("schema.registry.client.schema.version.cache.size", 10L);
registryConfig.put("schema.registry.client.schema.version.text.size", 10L);
registryConfig.put("schemaregistry.deserializer.schema.cache.expiry.secs", 10000L);

SchemaRegistryClient registryClient = new SchemaRegistryClient(registryConfig);

AvroSnapshotDeserializer deserializer = new AvroSnapshotDeserializer(registryClient);
deserializer.init(registryConfig);

Path p = Paths.get("/tmp/dump.avro");
InputStream is = Files.newInputStream(p);
deserializer.deserialize(is);

但它抛出了

Exception in thread "main" com.hortonworks.registries.schemaregistry.serdes.avro.exceptions.AvroException: Unknown protocol id [79] received while deserializing the payload
  at com.hortonworks.registries.schemaregistry.serdes.avro.AvroSnapshotDeserializer.checkProtocolHandlerExists(AvroSnapshotDeserializer.java:70)
  at com.hortonworks.registries.schemaregistry.serdes.avro.AvroSnapshotDeserializer.retrieveProtocolId(AvroSnapshotDeserializer.java:63)
  at com.hortonworks.registries.schemaregistry.serdes.avro.AvroSnapshotDeserializer.retrieveProtocolId(AvroSnapshotDeserializer.java:32)
  at com.hortonworks.registries.schemaregistry.serde.AbstractSnapshotDeserializer.deserialize(AbstractSnapshotDeserializer.java:141)
  at com.hortonworks.registries.schemaregistry.serde.AbstractSnapshotDeserializer.deserialize(AbstractSnapshotDeserializer.java:55)
  at com.hortonworks.registries.schemaregistry.serde.SnapshotDeserializer.deserialize(SnapshotDeserializer.java:60)

我知道您很难重现这个问题，因为它需要我的模式注册表和一个文件。不过，我希望我在这里做了一些愚蠢的事情。任何帮助都将不胜感激。

Answer 1

好吧..。我意识到错误消息中的79是字母O的ASCII代码。然后我仔细检查了我的文件是否真的在使用模式注册表-事实证明它们不是，它们只是嵌入了模式的Avro文件。因此，我不需要Hortonworks的AvroSnapshotDeserializer --简单的DataFileReader就可以了。