bridge

Type Members

1. case class CatchupRequestSucceeded(logSubrange: LogSubrange) extends Product with Serializable

   

2. case class ContinueCatchup(fromSeq: Long) extends Product with Serializable

   

3. case class InitiateCatchup(fromSeq: Long) extends Product with Serializable

   

4. class PaxosStateBridge extends Actor with MonitoringHooks

   

   Actor responsible for bridging the gap between the Paxos layer and the persistence layer.

   Actor responsible for bridging the gap between the Paxos layer and the persistence layer.

   This Actor contains the necessary logic for assuring that events are only applied to the persistence layer in order. As designed currently (on purpose) the Paxos system will blindly deliver decisions, even if they have already been decided. This allows nodes that are behind to catch up. Also, there is no guarantee that events will arrive in order, so a later event may arrive before a current event.

   To accomplish this we buffer events that come before their time, only keeping the first copy of each.

   XXX: in its current form it does not wait for confirmation that an event has been committed to disk by the persistence layer, we should really add that, but for now this should be good enough.