Thin Client connectivity with Phoenix Query Server

The Phoenix Query Server (PQS) is a component of the Apache Phoenix distribution. PQS provides an alternative means to connect directly. PQS is a stand-alone server that converts custom API calls from "thin clients" to HTTP requests that make use of Phoenix capabilities.

This topology offloads most computation to PQS and requires a smaller client-side footprint. The PQS client protocol is based on the Avatica component of Apache Calcite.