Discrete exchange and update of multiple consistent subset views of an evolving data store

Abstract

A system for reading a plurality of subset views of an evolving data store may include for each subset view, a plurality of memory buffers comprising at least three buffers. The system may also include control circuitry for controlling the plurality of memory buffers of the plurality of subset views, the control circuitry configured to maintain, for each subset view, a variable defining a most-recently updated buffer of the plurality of buffers such that a read request for such subset view will respond with data of the most-recently updated buffer of such subset view; and responsive to an update of data of the evolving data store: (i) determine, for each subset view, a selected data buffer of the plurality of buffers other than the most-recently updated buffer for such subset view to write updated subset view information; (ii) cause, for each subset view, the updated subset view information for such subset view to be written to the selected data buffer for such subset view; and (iii) substantially simultaneously across all of the plurality of subset views, update the variables defining the most-recently updated buffer of the plurality of subset views such that a subsequent read request for a subset view will respond with the updated subset view information for such subset view.