presto-gateway

A load balancer / proxy / gateway for presto compute engine.

How to setup a dev environment

Step 1: setup mysql. Install docker and run the below command when setting up first time:

docker run -d -p 3306:3306  --name mysqldb -e MYSQL_ROOT_PASSWORD=root123 -e MYSQL_DATABASE=prestogateway -d mysql:5.7

Next time onwards, run the following commands to start mysqldb

docker start mysqldb

Now open mysql console and install the presto-gateway tables:

mysql -uroot -proot123 -h127.0.0.1 -Dprestogateway

Once logged in to mysql console, please run gateway-ha-persistence.sql to populate the tables.

Step 2: Edit the configuration gateway-ha-config.yml

Step 3: Add below program argument to class HaGatewayLauncher and debug in IDE

server /path/to/gateway-ha/src/test/resources/config-template.yml

Build and run

run mvn clean install to build presto-gateway

Edit the config file and update the mysql db information.

cd gateway-ha/target/
java -jar gateway-ha-{{VERSION}}-jar-with-dependencies.jar server ../gateway-ha-config.yml

Now you can access load balanced presto at localhost:8080 port. We will refer to this as prestogateway.lyft.com

Gateway API

Add or update a backend

curl -X POST http://localhost:8080/entity?entityType=GATEWAY_BACKEND \
 -d '{  "name": "presto1", \ 
        "proxyTo": "http://presto1.lyft.com",\
        "active": true, \
        "routingGroup": "adhoc" \
    }'

curl -X POST http://localhost:8080/entity?entityType=GATEWAY_BACKEND \
 -d '{  "name": "presto2", \ 
        "proxyTo": "http://presto2.lyft.com",\
        "active": true, \
        "routingGroup": "adhoc" \
    }'

Get all backends behind the gateway

curl -X GET http://localhost:8080/entity/GATEWAY_BACKEND
[
    {
        "active": true,
        "name": "presto1",
        "proxyTo": "http://presto1.lyft.com",
        "routingGroup": "adhoc"
    },
    {
        "active": true,
        "name": "presto2",
        "proxyTo": "http://presto2.lyft.com",
        "routingGroup": "adhoc"
    }
]

Deactivate a backend

curl -X POST http://localhost:8080/gateway/backend/deactivate/presto2

Get all active backend behind the Gateway

curl -X GET http://localhost:8080/gateway/backend/active | python -m json.tool

    [{
        "active": true,
        "name": "presto1",
        "proxyTo": "http://presto1.lyft.com",
        "routingGroup": "adhoc"
    }]

Activate a backend

curl -X POST http://localhost:8080/gateway/backend/activate/presto2

Query History UI - check query plans etc.

PrestoGateway records history of recent queries and displays links to check query details page in respective presto cluster.

Gateway Admin UI - add and modify backend information

The Gateway admin page is used to configure the gateway to multiple backends. Existing backend information can also be modified using the same.

Contributing

Want to help build Presto Gateway? Check out our contributing documentation

References ✨

Scaling Presto Infra with gateway at Lyft

Presto-gateway at Pinterest