Pulsar Schema
Pulsar schema enables you to use language-specific types of data when constructing and handling messages from simple types to more complex application-specific types.
Schema 类型(Schema type)
Producer<String> producer = client.newProducer(Schema.STRING).create();producer.newMessage().value("Hello Pulsar!").send();Consumer<String> consumer = client.newConsumer(Schema.STRING).subscribe();consumer.receive();
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1. keyvalue key/value pair.
Schema<KeyValue<Integer, String>> schema = Schema.KeyValue(Schema.INT32,Schema.STRING,KeyValueEncodingType.SEPARATED);// ProducerProducer<KeyValue<Integer, String>> producer = client.newProducer(schema) .topic(TOPIC) .create();final int key = 100;final String value = "value-100";producer.newMessage().value(new KeyValue<>(key, value)).send();// ConsumerConsumer<KeyValue<Integer, String>> consumer = client.newConsumer(schema) .topic(TOPIC).subscriptionName(SubscriptionName).subscribe();Message<KeyValue<Integer, String>> msg = consumer.receive();
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2.struct AVRO, JSON, and Protobuf.
Producer<User> producer = client.newProducer(Schema.AVRO(User.class)).create();producer.newMessage().value(User.builder().userName("pulsar-user").userId(1L).build()).send();Consumer<User> consumer = client.newConsumer(Schema.AVRO(User.class)).subscribe();User user = consumer.receive();
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Schema 工作方式(How does schema work)
Producer
Consumer
Schema 管理(Schema manual management)
查询 Schema
$ $PULSAR_HOME/bin/pulsar-admin schemas \get persistent://public/default/spirit-avro-topic$ $PULSAR_HOME/bin/pulsar-admin schemas \get persistent://public/default/spirit-avro-topic \--version=2
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更新 Schema
$ $PULSAR_HOME/bin/pulsar-admin schemas upload \persistent://public/default/test-topic \--filename $PULSAR_HOME/connectors/json-schema.json
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提取 Schema
$ $PULSAR_HOME/bin/pulsar-admin schemas \extract persistent://public/default/test-topic \--classname com.cloudwise.modal.Packet \--jar ~/cloudwise-pulsar-1.0.0-RELEASE.jar \--type jsonpublic void schemaInfo() { System.out.println("AvroSchema:" + AvroSchema.of(SeedEvent.class).getSchemaInfo()); System.out.println("Schema.AVRO:" + Schema.AVRO(SeedEvent.class).getSchemaInfo());}
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删除 Schema
$ $PULSAR_HOME/bin/pulsar-admin schemas \delete persistent://public/default/spirit-avro-topic
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系列阅读
深入浅出Apache Pulsar（1）：Pulsar vs Kafka
深入浅出Apache Pulsar（2）：Pulsar消息机制
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