Cygnus is a connector in charge of persisting certain sources of data in certain configured third-party storages, creating a historical view of such data.

Internally, Cygnus is based on Apache Flume, a technology addressing the design and execution of data collection and persistence agents. An agent is basically composed of a listener or source in charge of receiving the data, a channel where the source puts the data once it has been transformed into a Flume event, and a sink, which takes Flume events from the channel in order to persist the data within its body into a third-party storage.

Cygnus is designed to run a specific Flume agent per source of data.

Current stable release is able to persist the following sources of data in the following third-party storages:

• NGSI-like context data in:
  • HDFS, the Hadoop distributed file system.
  • MySQL, the well-know relational database manager.
  • CKAN, an Open Data platform.
  • MongoDB, the NoSQL document-oriented database.
  • FIWARE Comet (STH), a Short-Term Historic database built on top of MongoDB.

Documentation and API

Additional information and documentation about the Cygnus component can be obtained at the ReadTheDocs site of the component as well as at its Github repository.