Describes one Actor's acknowledgement frontier.
[actorID, sessionID, sessionEnd, ...] contains removal Session/frontier pairs.
Actor-only tuples establish membership before removals, including offline Actors.
Compaction requires equal complete Session frontiers from every active Actor.
The application must deliver pending history before claiming that frontier.
Describes one Actor's acknowledgement frontier.
[actorID, sessionID, sessionEnd, ...]contains removal Session/frontier pairs. Actor-only tuples establish membership before removals, including offline Actors. Compaction requires equal complete Session frontiers from every active Actor. The application must deliver pending history before claiming that frontier.