我有一个应用程序正在以Avro格式写入文件(每个文件有多条记录(,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
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
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)
我知道你很难重现这个问题,因为它需要我的模式注册表和一个文件。不过,我希望我在这里做一些傻事。如有任何帮助,我们将不胜感激。
好的。。。我已经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使用了模式注册表——结果发现它们没有。它们只是带有嵌入式模式的Avro文件。因此,我不需要Hortonworks的AvroSnapshotDeserializer
——简单的DataFileReader
就可以了