Concepts inProviding high availability using lazy replication
Optimistic replication
Optimistic replication (also known as lazy replication) is a strategy for replication in which replicas are allowed to diverge. Traditional pessimistic replication systems try to guarantee from the beginning that all of the replicas are identical to each other, as if there was only a single copy of the data all along.
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High availability
High availability is a system design approach and associated service implementation that ensures a prearranged level of operational performance will be met during a contractual measurement period. Users want their systems, for example wrist watches, hospitals, airplanes or computers, to be ready to serve them at all times.
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Causality
Causality (also referred to as causation) is the relationship between an event (the cause) and a second event, where the second event is understood as a consequence of the first. In common usage, causality is also the relationship between a set of factors (causes) and a phenomenon. Anything that affects an effect is a factor of that effect. A direct factor is a factor that affects an effect directly, that is, without any intervening factors.
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Total order
In set theory, a total order, linear order, simple order, or (non-strict) ordering is a binary relation (here denoted by infix ¿) on some set X. The relation is transitive, antisymmetric, and total. A set paired with a total order is called a totally ordered set, a linearly ordered set, a simply ordered set, or a chain. If X is totally ordered under ¿, then the following statements hold for all a, b and c in X: If a ¿ b and b ¿ a then a = b; If a ¿ b and b ¿ c then a ¿ c; a ¿ b or b ¿ a .
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Reliable multicast
A reliable multicast protocol is a computer networking protocol that provides a reliable sequence of packets to multiple recipients simultaneously, making it suitable for applications like multi-receiver file transfer or streaming media.
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Respect
Respect gives a positive feeling of esteem or deference for a person or other entity (such as a nation or a religion), and also specific actions and conduct representative of that esteem. Respect can be a specific feeling of regard for the actual qualities of the one respected (e.g. , "I have great respect for her judgment"). It can also be conduct in accord with a specific ethic of respect.
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Force
In physics, a force is any influence that causes an object to undergo a certain change, either concerning its movement, direction, or geometrical construction. In other words, a force is that which can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e. , to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull.
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