Coordinator

Coordinator is the central component of NES and is responsible for processing user requests, scheduling queries, and managing the life-cycle of query execution. This component allows the user to interact with it via the REST interface. The user has the option to:

• Submit a query
• Remove a query
• Check status of a query
• List currently running queries
• Register a new logical source (explanation to be added)
• Fetch information about an existing logical stream
• List all physical sources (explanation to be added) for a given logical source, etc

In the current version of NES, the coordinator is the single-point-of-failure for the entire cluster. This means if the Coordinator is shut-down for some reason, all running queries will be terminated.