PhilipJameson-GCS - Group Communication Specifications...

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Click to edit Master subtitle style 8/1/11 Group Communication Specifications Philip Jameson
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8/1/11 Outline l What is a Group Communication System l Membership Service l Multicast Service l Message Safety/Consistency l Ordering and Reliability l Liveness
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8/1/11 Group Communication System (GCS l Group Players in an online game Participants in a video conference l View Managed by Membership Service List of all connected processes l Messages Delivered by Multicast Service
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8/1/11 Interaction with the CGS l send(p, m) l recv(p,m) l safe_prefix(p,m) l view_change(p,(id, members),T) l crash(p) l recover(p)
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8/1/11 Process/GCS Interaction
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8/1/11 Outline l What is a Group Communication System l Membership Service l Multicast Service l Message Safety/Consistency l Ordering and Reliability l Liveness
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8/1/11 Membership Service l Responsible for alerting members of a change in topology l Help maintain ‘Local Monotonicity’ Each new view must have an ID greater than the last Helps crashed/joining nodes regain consistency Prevents processes from installing same view twice
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PhilipJameson-GCS - Group Communication Specifications...

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