深入浅出Apache|深入浅出Apache Pulsar（3）（Pulsar Schema）深入浅出ApachePulsar（3）：Pul

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.

类型安全(序列化和反序列化)
Schema 帮助 Pulsar 保留了数据在其他系统中原有的含义

Schema类型(Schema type)

Primitive type

Producer producer = client.newProducer(Schema.STRING).create(); producer.newMessage().value("Hello Pulsar!").send(); Consumer consumer = client.newConsumer(Schema.STRING).subscribe(); consumer.receive();

Complex type

1. keyvalue key/value pair.

Schema> schema = Schema.KeyValue( Schema.INT32, Schema.STRING, KeyValueEncodingType.SEPARATED ); // Producer Producer> producer = client.newProducer(schema) .topic(TOPIC) .create(); final int key = 100; final String value = "https://www.it610.com/article/value-100"; producer.newMessage().value(new KeyValue<>(key, value)).send(); // Consumer Consumer> consumer = client.newConsumer(schema) .topic(TOPIC).subscriptionName(SubscriptionName).subscribe(); Message> msg = consumer.receive();

2.struct AVRO, JSON, and Protobuf.

Producer producer = client.newProducer(Schema.AVRO(User.class)).create(); producer.newMessage().value(User.builder().userName("pulsar-user").userId(1L).build()).send(); Consumer consumer = client.newConsumer(Schema.AVRO(User.class)).subscribe(); User user = consumer.receive();

Schema工作方式(How does schema work) Producer

深入浅出Apache|深入浅出Apache Pulsar（3）（Pulsar Schema）

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Consumer

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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

更新Schema

$ $PULSAR_HOME/bin/pulsar-admin schemas upload \ persistent://public/default/test-topic \ --filename $PULSAR_HOME/connectors/json-schema.json

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 json public void schemaInfo() { System.out.println("AvroSchema:" + AvroSchema.of(SeedEvent.class).getSchemaInfo()); System.out.println("Schema.AVRO:" + Schema.AVRO(SeedEvent.class).getSchemaInfo()); }

删除Schema

$ $PULSAR_HOME/bin/pulsar-admin schemas \ delete persistent://public/default/spirit-avro-topic

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