21.3 Durable Writer History

The 47.9 DURABILITY QosPolicy controls whether or not, and how, published samples are stored by the DataWriter application for DataReaders that are found after the samples were initially written. The samples stored by the DataWriter constitute the DataWriter’s history.

Connext provides the capability to make the DataWriter history durable, by persisting its content in a relational database. This makes it possible for the history to be restored when the DataWriter restarts.

The association between the history stored in the database and the DataWriter is done using the virtual GUID.