Client

Client (Presto CLI) submits SQL statements to a coordinator to get the result.

Coordinator

Coordinator is a master daemon. The coordinator initially parses the SQL queries then analyzes and plans for the query execution. Scheduler performs pipeline execution, assigns work to the closest node and monitors progress.

Connector

Storage plugins are called as connectors. Hive, HBase, MySQL, Cassandra and many more act as a connector; otherwise you can also implement a custom one. The connector provides metadata and data for queries. The coordinator uses the connector to get metadata for building a query plan.

Worker

The coordinator assigns task to worker nodes. The workers get actual data from the connector. Finally, the worker node delivers result to the client.