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. The thin clients access the PQS using HTTP, and the PQS executes the statements for the thin clients, and returns the results.

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.