Pulsar REST

Pulsar not only provides REST endpoints to manage resources in Pulsar clusters, but also provides methods to query the state for those resources. In addition, Pulsar REST provides a simple way to interact with Pulsar without using client libraries, which is convenient for applications to use HTTP to interact with Pulsar.

Connection

To connect to Pulsar, you need to specify a URL.

• Produce messages to non-partitioned or partitioned topics

  brokerUrl:{8080/8081}/topics/{persistent/non-persistent}/{my-tenant}/{my-namespace}/{my-topic}

• Produce messages to specific partitions of partitioned topics

  brokerUrl:{8080/8081}/topics/{persistent/non-persistent}/{my-tenant}/{my-namespace}/{my-topic}/partitions/{partition-number}

Producer

Currently, you can produce messages to the following destinations with tools like cURL or Postman via REST.

• Non-partitioned or partitioned topics

• Specific partitions of partitioned topics

note

You can only produce messages to topics that already exist in Pulsar via REST.

Consuming and reading messages via REST will be supported in the future.

Message

• Below is the structure of a request payload.

  Parameter	Required?	Description
  schemaVersion	No	Schema version of existing schema used for this message You need provide one of the following: - schemaVersion - keySchema/valueSchema If both of them are provided, then schemaVersion is used
  keySchema/valueSchema	No	Key schema / Value schema used for this message
  producerName	No	Producer name
  Messages[] SingleMessage	Yes	Messages to be sent

• Below is the structure of a message.

  Parameter	Required?	Type	Description
  payload	Yes	String	Actual message payload Messages are sent in strings and encoded with given schemas on the server side
  properties	No	Map<String, String>	Custom properties
  key	No	String	Partition key
  replicationClusters	No	List<String>	Clusters to which messages replicate
  eventTime	No	String	Message event time
  sequenceId	No	long	Message sequence ID
  disableReplication	No	boolean	Whether to disable replication of messages
  deliverAt	No	long	Deliver messages only at or after specified absolute timestamp
  deliverAfterMs	No	long	Deliver messages only after specified relative delay (in milliseconds)

Schema

• Currently, Primitive, Avro, JSON, and KeyValue schemas are supported.

• For Primitive, Avro and JSON schemas, schemas should be provided as the full schema encoded as a string.

• If the schema is not set, messages are encoded with string schema.

Example

Below is an example of sending messages to topics using JSON schema via REST.

Assume that you send messages representing the following class.

   class Seller {
        public String state;
        public String street;
        public long zipCode;
    }
    class PC {
        public String brand;
        public String model;
        public int year;
        public GPU gpu;
        public Seller seller;
    }

Send messages to topics with JSON schema using the command below.

curl --location --request POST 'brokerUrl:{8080/8081}/topics/{persistent/non-persistent}/{my-tenant}/{my-namespace}/{my-topic}' \
--header 'Content-Type: application/json' \
--data-raw '{
  "valueSchema": "{\"name\":\"\",\"schema\":\"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\",\"type\":\"JSON\",\"properties\":{\"__jsr310ConversionEnabled\":\"false\",\"__alwaysAllowNull\":\"true\"},\"schemaDefinition\":\"{\\\"type\\\":\\\"record\\\",\\\"name\\\":\\\"PC\\\",\\\"namespace\\\":\\\"org.apache.pulsar.broker.admin.TopicsTest\\\",\\\"fields\\\":[{\\\"name\\\":\\\"brand\\\",\\\"type\\\":[\\\"null\\\",\\\"string\\\"],\\\"default\\\":null},{\\\"name\\\":\\\"gpu\\\",\\\"type\\\":[\\\"null\\\",{\\\"type\\\":\\\"enum\\\",\\\"name\\\":\\\"GPU\\\",\\\"symbols\\\":[\\\"AMD\\\",\\\"NVIDIA\\\"]}],\\\"default\\\":null},{\\\"name\\\":\\\"model\\\",\\\"type\\\":[\\\"null\\\",\\\"string\\\"],\\\"default\\\":null},{\\\"name\\\":\\\"seller\\\",\\\"type\\\":[\\\"null\\\",{\\\"type\\\":\\\"record\\\",\\\"name\\\":\\\"Seller\\\",\\\"fields\\\":[{\\\"name\\\":\\\"state\\\",\\\"type\\\":[\\\"null\\\",\\\"string\\\"],\\\"default\\\":null},{\\\"name\\\":\\\"street\\\",\\\"type\\\":[\\\"null\\\",\\\"string\\\"],\\\"default\\\":null},{\\\"name\\\":\\\"zipCode\\\",\\\"type\\\":\\\"long\\\"}]}],\\\"default\\\":null},{\\\"name\\\":\\\"year\\\",\\\"type\\\":\\\"int\\\"}]}\"}",
// Schema data is just the base 64 encoded schemaDefinition.
  "producerName": "rest-producer",
  "messages": [
    {
      "key":"my-key",
      "payload":"{\"brand\":\"dell\",\"model\":\"alienware\",\"year\":2021,\"gpu\":\"AMD\",\"seller\":{\"state\":\"WA\",\"street\":\"main street\",\"zipCode\":98004}}",
      "eventTime":1603045262772,
      "sequenceId":1
    },
    {
      "key":"my-key",
      "payload":"{\"brand\":\"asus\",\"model\":\"rog\",\"year\":2020,\"gpu\":\"NVIDIA\",\"seller\":{\"state\":\"CA\",\"street\":\"back street\",\"zipCode\":90232}}",
      "eventTime":1603045262772,
      "sequenceId":2
    }
  ]
}
`
// Sample message