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

Question

我有一个应用程序正在以Avro格式写入文件（每个文件有多个记录），但是我无法在另一个Java应用程序中读取它。这是我尝试过的]]

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);
但是抛出

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)
我知道您很难重现此问题，因为它需要我的架构注册表和文件。不过，我希望我在这里做些愚蠢的事情。任何帮助，将不胜感激。 

我有一个应用程序正在以Avro格式写入文件（每个文件有多个记录），但是我无法在另一个Java应用程序中读取它。这是我尝试过的Map RegistryConfig = new ...

Answer 1

好的...我已经意识到错误消息中的79是字母ASCII的O代码。然后，我再次检查了我的文件是否真的使用架构注册表-事实证明它们不是。它们只是具有嵌入式架构的Avro文件。因此，我不需要Hortonworks的AvroSnapshotDeserializer-简单的DataFileReader就可以。