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Solving Atomic Broadcast Eden : a Consensus Based Group Communication System p.1/ ?? Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions

  1. Solving Atomic Broadcast Eden : a Consensus Based Group Communication System – p.1/ ??

  2. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  3. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  4. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  5. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  6. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  7. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  8. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  9. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  10. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  11. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  12. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  13. Solving Atomic Broadcast ABcast ABdeliver Messages to order Identities of next messages Missing messages identities GAF Propose Decide Retransmissions UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.1/ ??

  14. Solving Membership Eden : a Consensus Based Group Communication System – p.2/ ??

  15. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  16. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  17. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  18. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  19. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  20. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  21. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  22. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  23. Solving Membership Join, Leave Membership Membership changes GAF Propose positive negative suspicion Decide Failure detector I am alive messages UDP Multicast UDP Multicast Eden : a Consensus Based Group Communication System – p.2/ ??

  24. Virtual Synchrony Eden : a Consensus Based Group Communication System – p.3/ ??

  25. Virtual Synchrony Membership is a useful service, not only because it helps tracking the group composition changes, but also because it helps garbaging old broadcast messages that were still stored for possible future retransmissions. Eden : a Consensus Based Group Communication System – p.3/ ??

  26. Virtual Synchrony Membership is a useful service, not only because it helps tracking the group composition changes, but also because it helps garbaging old broadcast messages that were still stored for possible future retransmissions. However, we also need to synchronize atomic broadcast with membership, to determine each time a view change occurs after which message (atomically broadcast) will this change be installed. Eden : a Consensus Based Group Communication System – p.3/ ??

  27. Virtual Synchrony Membership is a useful service, not only because it helps tracking the group composition changes, but also because it helps garbaging old broadcast messages that were still stored for possible future retransmissions. However, we also need to synchronize atomic broadcast with membership, to determine each time a view change occurs after which message (atomically broadcast) will this change be installed. This is the goal of Virtual Synchrony (VS). Eden : a Consensus Based Group Communication System – p.3/ ??

  28. A Complex Solution to VS Eden : a Consensus Based Group Communication System – p.4/ ??

  29. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  30. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  31. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  32. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  33. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  34. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  35. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  36. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  37. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  38. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  39. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  40. A Complex Solution to VS Join, Leave View ABcast merge Membership Atomic Broadcast + VS Eden : a Consensus Based Group Communication System – p.4/ ??

  41. Our Implementation of VS Eden : a Consensus Based Group Communication System – p.5/ ??

  42. Our Implementation of VS We mostly rely on the ability of GAF to decide for multiple agreement problems at the same time. Eden : a Consensus Based Group Communication System – p.5/ ??

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