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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:
PULSAR_STANDALONE_USE_ZOOKEEPER=1 ./bin/pulsar standalone
note

Starting the Pulsar standalone cluster from scratch doesn't enable ZooKeeper by default. However, the Pulsar SQL depends on ZooKeeper. Therefore, you need to set PULSAR_STANDALONE_USE_ZOOKEEPER=1 to enable ZooKeeper.

  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:
trino> show catalogs;
Catalog
---------
pulsar
system
(2 rows)

Query 20180829_211752_00004_7qpwh, FINISHED, 1 node
Splits: 19 total, 19 done (100.00%)
0:00 [0 rows, 0B] [0 rows/s, 0B/s]


trino> show schemas in pulsar;
Schema
-----------------------
information_schema
public/default
public/functions
(3 rows)

Query 20180829_211818_00005_7qpwh, FINISHED, 1 node
Splits: 19 total, 19 done (100.00%)
0:00 [4 rows, 89B] [21 rows/s, 471B/s]


trino> show tables in pulsar."public/default";
Table
-------
(0 rows)

Query 20180829_211839_00006_7qpwh, FINISHED, 1 node
Splits: 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 are 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":

trino> show tables in pulsar."public/default";
Table
----------------
generator_test
(1 row)

Query 20180829_213202_00000_csyeu, FINISHED, 1 node
Splits: 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":

trino> 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.