Connect PrestoDB to StarTree Cloud

How to install PrestoDB

There are a few ways to install and utilize PrestoDB. You can:

For more information, view How to Get Started with PrestoDB (opens in a new tab).

PrestoDB Pinot Proxy

Our Solution

In a StarTree deployment, Pinot components are hosted within a Kubernetes cluster. Pinot server endpoints are not exposed outside the Kubernetes cluster in this setup. While this is fine for most use cases, it creates a problem for external services like PrestoDB.

Pinot Proxy is our solution to enable PrestoDB connection into the Pinot cluster when inside the Kubernetes cluster. Without Pinot Proxy, we will have to create dedicated Kubernetes routes for each single Pinot Server host, and such a solution is not scalable for Kubernetes.

High-Level Architecture

At a very high level, Pinot Proxy behaves similarly to a reverse proxy like Nginx. It proxies RPC requests into Pinot clusters inside Kubernetes.

A special feature of Pinot Proxy is that it can forward PrestoDB gRPC requests to specific Pinot Servers rather than routing them by load balancers.

This diagram illustrates how it communicates with PrestoDB Pinot drivers.

proxy-architecture

We have detailed slides (opens in a new tab) explaining the technical aspect of this design and why we need a Pinot proxy.

What does it mean for Pinot Clients

The main benefit is that with Pinot Proxy, PrestoDB can finally run queries in streaming mode when connecting to Pinot inside a Kubernetes cluster.

Example: You can use pinot.use-streaming-for-segment-queries=true in your pinot.properties file.

For more information on Pinot connectors, view Apache Pinot Connector (opens in a new tab) documentation.

Connection Settings for PrestoDB

NOTE: PrestoDB has to be version 0.273 or higher to properly connect to Pinot in Kubernetes.

The PrestoDB connection URLs must be modified to point to Pinot Proxy host names to connect via Pinot Proxy. Suppose your pinot cluster is named pug, the environment name is prod, and StarTree cloud domain is awesome-company.startree.cloud. Below are the configs needed in pinot.properties configuration in PrestoDB:

## Replace the pug.prod.awesome-company.startree.cloud with the link to your pinot cluster
## For the clusters without TLS enabled, the port number will be 80
pinot.controller-urls=proxy.broker.pug.prod.awesome-company.startree.cloud:443

## Enable Pinot Rest Proxy
pinot.proxy-enabled=true

## Replace the pug.prod.awesome-company.startree.cloud with the link to your pinot cluster
pinot.grpc-host=proxy-grpc.broker.pug.prod.awesome-company.startree.cloud
## For the clusters without TLS enabled, the port number will be 80
pinot.grpc-port=443

Extra settings for clusters with TLS enabled

If the cluster has TLS enabled, we will need the extra properties in the configuration file.

## Enable secure connection for all traffic
pinot.secure-connection=true

#### Extra settings for clusters with "Secure" flag enabled (Auth enabled)
## The bearer token will have to be retrieved manually and long-lived
pinot.extra-http-headers=Authorization: Bearer eyJhbGciOiJSUz
pinot.extra-grpc-metadata=Authorization: Bearer eyJhbGciOiJSUz

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