Agreement problems Sample Clauses

Agreement problems. Consensus protocols are intensively used as building blocks for implementing higher-level services, of key importance when designing fault-tolerant distributed applications. Many practical problems such as electing a leader, or agreeing on a value of a replicated server, are solved by relying on a consensus algorithm. The consensus problem can be viewed as the "greatest common denominator" for a class of problems known as Agreement problems, which includes, among other: Atomic Broadcast, Group Membership and Atomic Commit. In the following, we provide a general overview of each of these agreement problems. Atomic Broadcast Reliable Broadcast is the weakest type of fault-tolerant broadcast. It requires that all processes agree on the delivered messages. Informally, if a correct process broadcasts a message then all correct processes eventually receive that message. Reliable Broadcast does not impose any message delivery ordering. On the contrary, Causal Broadcast guarantees that if the broadcast of a message m1 hap- pens before (or causally precedes) the broadcast of message m2, then no correct process de- livers m2 before m1. Atomic Broadcast [15] is an agreement problem that entails two aspects: processes agree on the set of messages they deliver and also on the order in which these messages are deliv- ered. Therefore, Atomic Broadcast (sometimes called Ordered Reliable Broadcast) represents a communication paradigm that ensures that all correct processes deliver the same sequence of messages. More formally, Atomic Broadcast is specified by the Total Order requirement: if two cor- rect processes pi and pj deliver two messages m1 and m2, then pi delivers m1 before m2 if and only if pj delivers m1 before m2. { } Group Membership As replication is a key solution for introducing fault-tolerance in dis- tributed applications, group-based computing facilitates the design of such applications. A group is defined as a set of processes that cooperate in order to accomplish a common task. If we consider an unbounded set of processes Π = p1, p2, ..., pn, ... , any subset forms a group. A composition of a group evolves in a dynamical manner: crash failures of group members may occur, a process may want to join the group or a member of the group may want to leave it. The current composition of the group defines the current view of the group. In group membership, consensus is often used to agree on the sequence of views of the group. Atomic Commit The transaction conce...
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Related to Agreement problems

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