PaxosMessages

Type Members

1. case class Adopted(ballotNum: Ballot, pvals: Set[PValue]) extends PaxosMessage with Product with Serializable

   

2. case class Command(client: ActorRef, ts: Long, op: NonCommutativeSiriusRequest) extends PaxosMessage with Product with Serializable

   

3. case class Decision(slot: Long, command: Command) extends PaxosMessage with Product with Serializable

   

4. case class DecisionHint(decision: Long) extends PaxosMessage with Product with Serializable

   

   A Hint about the last Decision executed by the Sirius System.

   A Hint about the last Decision executed by the Sirius System. Used to reduce the amount of information the Acceptor sends in Phase1B message. Also used by the Leader to not repropose already decided proposals.

   decision

   last decision executed

5. case class PValue(ballot: Ballot, slotNum: Long, proposedCommand: Command) extends PaxosMessage with Product with Serializable

   

6. sealed trait PaxosMessage extends AnyRef

   

7. case class Phase1A(from: ActorRef, ballot: Ballot, replyAs: ActorRef, latestDecidedSlot: Long) extends PaxosMessage with Product with Serializable

   

   Message used by a Scout to advocate a Ballot

   Message used by a Scout to advocate a Ballot

   from

   The ActorRef sending this request, this will always be the sending Scout, and most likely always be the same as the sender of this message. We include this param for similarity to the algorithm described in Paxos Made Moderately Complex and for flexibility

   ballot

   The Ballot which we are trying to make active

   replyAs

   An ActorRef that the receiving acceptor must supply in the from field of the Phase1B message, allowing us to cleanly uniquely identify a node

   latestDecidedSlot

   The lastest decided slot that we know about, used to reduce number of accepted decisions sent in Phase1B

   See also

   DecisionHint

8. case class Phase1B(from: ActorRef, ballot: Ballot, r: Set[PValue]) extends PaxosMessage with Product with Serializable

   

   Message sent back to a Scout from an Acceptor during Ballot negotiation

   Message sent back to a Scout from an Acceptor during Ballot negotiation

   from

   The ActorRef identifying the sending acceptor, this should always be set to the value supplied in the replyAs field of Phase1A messages, such that the requesting Scout can properly identify the source of the message

   ballot

   The sending Acceptor's current Ballot

   r

   the set of PValues this Acceptor has retained TODO: this name could be better

9. case class Phase2A(from: ActorRef, pvalue: PValue, replyAs: ActorRef) extends PaxosMessage with Product with Serializable

   

   Message used by commander to advocate a PValue (used to find a decision for a Proposal)

   Message used by commander to advocate a PValue (used to find a decision for a Proposal)

   from

   The ActorRef sending this request, this will always be the sending Commander, and most likely always be the same as the sender of this message. We include this param for similarity to the algorithm described in Paxos Made Moderately Complex and for flexibility

   pvalue

   The PValue for which the initiating commander is trying to have the cluster arrive at a decision

   replyAs

   An ActorRef that the receiving acceptor must supply in the from field of the Phase2B message, allowing us to cleanly uniquely identify a node

10. case class Phase2B(acceptor: ActorRef, ballot: Ballot) extends PaxosMessage with Product with Serializable

    

    Message sent back to a Commander from an Acceptor when deciding on a PValue

    Message sent back to a Commander from an Acceptor when deciding on a PValue

    acceptor

    The ActorRef identifying the sending acceptor, this should always be set to the value supplied in the replyAs field of Phase2A messages, such that the requesting Scout can properly identify the source of the message

    ballot

    The sending Acceptor's current Ballot

11. case class Preempted(picked: Ballot) extends PaxosMessage with Product with Serializable

    

12. case class Propose(slot: Long, command: Command) extends PaxosMessage with Product with Serializable

    

13. case class Request(command: Command) extends PaxosMessage with Product with Serializable

    

14. case class Slot(num: Long, command: Command) extends PaxosMessage with Product with Serializable