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.

  • 类型平安(序列化和反序列化)
  • Schema 帮忙 Pulsar 保留了数据在其余零碎中原有的含意

Schema类型(Schema type)

  • Primitive 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();
  • Complex type

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();

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();

Schema工作形式(How does schema work)

Producer

Consumer

Schema治理(Schema manual management)

查问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 jsonpublic 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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系列浏览

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