Test YugaByte SQL (YSQL) API Beta

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Follow the instructions below to test YugaByte DB’s PostgreSQL-compatible YSQL API.

psql is a command line shell for interacting with PostgreSQL. For ease of use, YugaByte DB ships with a version of psql in its bin directory.

1. Create a new cluster

Destroy any existing cluster.

$ ./bin/yb-ctl destroy

Create a new cluster with YSQL API enabled. Note the additional option enable_postgres passed to the create cluster command.

You can do this as shown below.

$ ./bin/yb-ctl --rf 3 create --enable_postgres

Check status of the cluster and confirm that the special postgres node is now running. This is the node we will connect postgres clients to. Internally, this node will use the various tserver nodes to distribute the data across the entire cluster.

$ ./bin/yb-ctl status

2019-01-15 22:18:40,387 INFO: Server is running: type=master, node_id=1, PID=12818, admin service=http://127.0.0.1:7000
2019-01-15 22:18:40,394 INFO: Server is running: type=master, node_id=2, PID=12821, admin service=http://127.0.0.2:7000
2019-01-15 22:18:40,401 INFO: Server is running: type=master, node_id=3, PID=12824, admin service=http://127.0.0.3:7000
2019-01-15 22:18:40,408 INFO: Server is running: type=tserver, node_id=1, PID=12827, admin service=http://127.0.0.1:9000, cql service=127.0.0.1:9042, redis service=127.0.0.1:6379, pgsql service=127.0.0.1:5433
2019-01-15 22:18:40,415 INFO: Server is running: type=tserver, node_id=2, PID=12830, admin service=http://127.0.0.2:9000, cql service=127.0.0.2:9042, redis service=127.0.0.2:6379, pgsql service=127.0.0.2:5433
2019-01-15 22:18:40,422 INFO: Server is running: type=tserver, node_id=3, PID=12833, admin service=http://127.0.0.3:9000, cql service=127.0.0.3:9042, redis service=127.0.0.3:6379, pgsql service=127.0.0.3:5433

Run psql to connect to the service.

You can do this as shown below.

$ ./bin/psql -h 127.0.0.1 -p 5433 -U postgres

psql (10.3, server 10.4)
Type "help" for help.

postgres=#

Destroy any existing cluster.

$ ./bin/yb-ctl destroy

Create a new cluster with YSQL API enabled. Note the additional option enable_postgres passed to the create cluster command.

You can do this as shown below.

$ ./bin/yb-ctl --rf 3 create --enable_postgres

Check status of the cluster and confirm that the special postgres node is now running. This is the node we will connect postgres clients to. Internally, this node will use the various tserver nodes to distribute the data across the entire cluster.

$ ./bin/yb-ctl status

2019-01-15 22:18:40,387 INFO: Server is running: type=master, node_id=1, PID=12818, admin service=http://127.0.0.1:7000
2019-01-15 22:18:40,394 INFO: Server is running: type=master, node_id=2, PID=12821, admin service=http://127.0.0.2:7000
2019-01-15 22:18:40,401 INFO: Server is running: type=master, node_id=3, PID=12824, admin service=http://127.0.0.3:7000
2019-01-15 22:18:40,408 INFO: Server is running: type=tserver, node_id=1, PID=12827, admin service=http://127.0.0.1:9000, cql service=127.0.0.1:9042, redis service=127.0.0.1:6379, pgsql service=127.0.0.1:5433
2019-01-15 22:18:40,415 INFO: Server is running: type=tserver, node_id=2, PID=12830, admin service=http://127.0.0.2:9000, cql service=127.0.0.2:9042, redis service=127.0.0.2:6379, pgsql service=127.0.0.2:5433
2019-01-15 22:18:40,422 INFO: Server is running: type=tserver, node_id=3, PID=12833, admin service=http://127.0.0.3:9000, cql service=127.0.0.3:9042, redis service=127.0.0.3:6379, pgsql service=127.0.0.3:5433

Run psql to connect to the service.

You can do this as shown below.

$ ./bin/psql -h 127.0.0.1 -p 5433 -U postgres

psql (10.3, server 10.4)
Type "help" for help.

postgres=#

1. Create a new cluster

Destroy any existing cluster.

$ ./yb-docker-ctl destroy

Create a new cluster with YSQL API enabled. Note the additional option enable_postgres passed to the create cluster command. Also note that this requires at least version 1.1.2.0-b10 of YugaByte DB.

$ ./yb-docker-ctl create --rf 3 --enable_postgres

Check status of the cluster

$ ./yb-docker-ctl status

ID             PID        Type       Node                 URL                       Status          Started At
ca16705b20bd   5861       tserver    yb-tserver-n3        http://192.168.64.7:9000  Running         2018-10-18T22:02:52.12697026Z
0a7deab4e4db   5681       tserver    yb-tserver-n2        http://192.168.64.6:9000  Running         2018-10-18T22:02:51.181289786Z
921494a8058d   5547       tserver    yb-tserver-n1        http://192.168.64.5:9000  Running         2018-10-18T22:02:50.187976253Z
0d7dc9436033   5345       master     yb-master-n3         http://192.168.64.4:7000  Running         2018-10-18T22:02:49.105792573Z
0b25dd24aea3   5191       master     yb-master-n2         http://192.168.64.3:7000  Running         2018-10-18T22:02:48.162506832Z
feea0823209a   5039       master     yb-master-n1         http://192.168.64.2:7000  Running         2018-10-18T22:02:47.163244578Z

Run psql to connect to the service.

You can do this as shown below.

$ docker exec -it yb-tserver-n1 /home/yugabyte/postgres/bin/psql -h yb-tserver-n1 -p 5433 -U postgres

psql (10.4)
Type "help" for help.

postgres=#

## 1. Create a new cluster

Destroy any existing cluster.

$ kubectl delete -f yugabyte-statefulset.yaml

Create a new cluster with YSQL API enabled.

First uncomment the following flags in the YAML file.

         # To support postgres functionality, uncomment the following flags.
         #  - "--start_pgsql_proxy"
         #  - "--pgsql_proxy_bind_address=$(POD_IP):5433"

Recreate the cluster.

$ kubectl apply -f yugabyte-statefulset.yaml

Check cluster status

Run the command below to see that we now have two services with 3 pods each - 3 yb-master pods (yb-master-1,yb-master-2,yb-master-3) and 3 yb-tserver pods (yb-tserver-1,yb-tserver-2,yb-tserver-3) running. Roles played by these pods in a YugaByte DB cluster (aka Universe) is explained in detail here.

$ kubectl get pods

NAME           READY     STATUS              RESTARTS   AGE
yb-master-0    0/1       ContainerCreating   0          5s
yb-master-1    0/1       ContainerCreating   0          5s
yb-master-2    1/1       Running             0          5s
yb-tserver-0   0/1       ContainerCreating   0          4s
yb-tserver-1   0/1       ContainerCreating   0          4s
yb-tserver-2   0/1       ContainerCreating   0          4s

Eventually all the pods will have the Running state.

$ kubectl get pods

NAME           READY     STATUS    RESTARTS   AGE
yb-master-0    1/1       Running   0          13s
yb-master-1    1/1       Running   0          13s
yb-master-2    1/1       Running   0          13s
yb-tserver-0   1/1       Running   1          12s
yb-tserver-1   1/1       Running   1          12s
yb-tserver-2   1/1       Running   1          12s

Initialize the YSQL API

$ kubectl exec -it yb-tserver-0 bash --  -c "YB_ENABLED_IN_POSTGRES=1 FLAGS_pggate_master_addresses=yb-master-0.yb-masters.default.svc.cluster.local:7100,yb-master-1.yb-masters.default.svc.cluster.local:7100,yb-master-2.yb-masters.default.svc.cluster.local:7100 /home/yugabyte/postgres/bin/initdb -D /tmp/yb_pg_initdb_tmp_data_dir -U postgres"

Run psql to connect to the service.

$ kubectl exec -it yb-tserver-0 /home/yugabyte/postgres/bin/psql -- -U postgres -d postgres -h yb-tserver-0 -p 5433

psql (10.4)
Type "help" for help.

postgres=#

2. Create a table

Create a database called ‘sample’.

postgres=> CREATE DATABASE sample;

Connect to the database we just created.

postgres=> \c sample

You are now connected to database "sample" as user "postgres".
sample=>

Create a table named ‘stock_market’ which can store stock prices at various timestamps for different stock ticker symbols.

sample=> CREATE TABLE stock_market (
  stock_symbol text,
  ts text,
  current_price float,
  PRIMARY KEY (stock_symbol, ts)
);

3. Insert data

Let us insert some data for a few stock symbols into our newly created ‘stock_market’ table. You can copy-paste these values directly into your psql shell.

INSERT INTO stock_market (stock_symbol,ts,current_price) VALUES ('AAPL','2017-10-26 09:00:00',157.41);
INSERT INTO stock_market (stock_symbol,ts,current_price) VALUES ('AAPL','2017-10-26 10:00:00',157);
INSERT INTO stock_market (stock_symbol,ts,current_price) VALUES ('FB','2017-10-26 09:00:00',170.63);
INSERT INTO stock_market (stock_symbol,ts,current_price) VALUES ('FB','2017-10-26 10:00:00',170.1);
INSERT INTO stock_market (stock_symbol,ts,current_price) VALUES ('GOOG','2017-10-26 09:00:00',972.56);
INSERT INTO stock_market (stock_symbol,ts,current_price) VALUES ('GOOG','2017-10-26 10:00:00',971.91);

4. Query the table

Query all the values we have inserted into the table.

sample=> SELECT * FROM stock_market ORDER BY stock_symbol ASC, ts DESC;

 stock_symbol |         ts          | current_price
--------------+---------------------+---------------
 AAPL         | 2017-10-26 10:00:00 |           157
 AAPL         | 2017-10-26 09:00:00 |        157.41
 FB           | 2017-10-26 10:00:00 |         170.1
 FB           | 2017-10-26 09:00:00 |        170.63
 GOOG         | 2017-10-26 10:00:00 |        971.91
 GOOG         | 2017-10-26 09:00:00 |        972.56
(6 rows)

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