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Version: 2.7.3

Query data with Pulsar SQL

Before querying data in Pulsar, you need to install Pulsar and built-in connectors.

Requirements#

  1. Install Pulsar.
  2. Install Pulsar built-in connectors.

Query data in Pulsar#

To query data in Pulsar with Pulsar SQL, complete the following steps.

  1. Start a Pulsar standalone cluster.
./bin/pulsar standalone
  1. Start a Pulsar SQL worker.
./bin/pulsar sql-worker run
  1. After initializing Pulsar standalone cluster and the SQL worker, run SQL CLI.
./bin/pulsar sql
  1. Test with SQL commands.
presto> show catalogs; Catalog --------- pulsar   system  (2 rows)
Query 20180829_211752_00004_7qpwh, FINISHED, 1 nodeSplits: 19 total, 19 done (100.00%)0:00 [0 rows, 0B] [0 rows/s, 0B/s]

presto> show schemas in pulsar;        Schema         ----------------------- information_schema     public/default         public/functions       sample/standalone/ns1 (4 rows)
Query 20180829_211818_00005_7qpwh, FINISHED, 1 nodeSplits: 19 total, 19 done (100.00%)0:00 [4 rows, 89B] [21 rows/s, 471B/s]

presto> show tables in pulsar."public/default"; Table -------(0 rows)
Query 20180829_211839_00006_7qpwh, FINISHED, 1 nodeSplits: 19 total, 19 done (100.00%)0:00 [0 rows, 0B] [0 rows/s, 0B/s]

Since there is no data in Pulsar, no records is returned.

  1. Start the built-in connector DataGeneratorSource and ingest some mock data.
./bin/pulsar-admin sources create --name generator --destinationTopicName generator_test --source-type data-generator

And then you can query a topic in the namespace "public/default".

presto> show tables in pulsar."public/default";     Table      ---------------- generator_test (1 row)
Query 20180829_213202_00000_csyeu, FINISHED, 1 nodeSplits: 19 total, 19 done (100.00%)0:02 [1 rows, 38B] [0 rows/s, 17B/s]

You can now query the data within the topic "generator_test".

presto> select * from pulsar."public/default".generator_test;
  firstname  | middlename  |  lastname   |              email               |   username   | password | telephonenumber | age |                 companyemail                  | nationalidentitycardnumber | -------------+-------------+-------------+----------------------------------+--------------+----------+-----------------+-----+-----------------------------------------------+----------------------------+ Genesis     | Katherine   | Wiley       | genesis.wiley@gmail.com          | genesisw     | y9D2dtU3 | 959-197-1860    |  71 | genesis.wiley@interdemconsulting.eu           | 880-58-9247                |    Brayden     |             | Stanton     | brayden.stanton@yahoo.com        | braydens     | ZnjmhXik | 220-027-867     |  81 | brayden.stanton@supermemo.eu                  | 604-60-7069                |    Benjamin    | Julian      | Velasquez   | benjamin.velasquez@yahoo.com     | benjaminv    | 8Bc7m3eb | 298-377-0062    |  21 | benjamin.velasquez@hostesltd.biz              | 213-32-5882                |    Michael     | Thomas      | Donovan     | donovan@mail.com                 | michaeld     | OqBm9MLs | 078-134-4685    |  55 | michael.donovan@memortech.eu                  | 443-30-3442                |    Brooklyn    | Avery       | Roach       | brooklynroach@yahoo.com          | broach       | IxtBLafO | 387-786-2998    |  68 | brooklyn.roach@warst.biz                      | 085-88-3973                |    Skylar      |             | Bradshaw    | skylarbradshaw@yahoo.com         | skylarb      | p6eC6cKy | 210-872-608     |  96 | skylar.bradshaw@flyhigh.eu                    | 453-46-0334                |    ...

You can query the mock data.

Query your own data#

If you want to query your own data, you need to ingest your own data first. You can write a simple producer and write custom defined data to Pulsar. The following is an example. 

public class TestProducer {
    public static class Foo {        private int field1 = 1;        private String field2;        private long field3;
        public Foo() {        }
        public int getField1() {            return field1;        }
        public void setField1(int field1) {            this.field1 = field1;        }
        public String getField2() {            return field2;        }
        public void setField2(String field2) {            this.field2 = field2;        }
        public long getField3() {            return field3;        }
        public void setField3(long field3) {            this.field3 = field3;        }    }
    public static void main(String[] args) throws Exception {        PulsarClient pulsarClient = PulsarClient.builder().serviceUrl("pulsar://localhost:6650").build();        Producer<Foo> producer = pulsarClient.newProducer(AvroSchema.of(Foo.class)).topic("test_topic").create();
        for (int i = 0; i < 1000; i++) {            Foo foo = new Foo();            foo.setField1(i);            foo.setField2("foo" + i);            foo.setField3(System.currentTimeMillis());            producer.newMessage().value(foo).send();        }        producer.close();        pulsarClient.close();    }}