The flexibility associated with these limited forms of event reordering and optimistic early delivery permit virtual synchrony platforms to achieve extremely high data rates while still preserving very strong fault-tolerance and consistency guarantees.
42.
In the most widely used software libraries implementing the model, virtual synchrony is typically employed within individual objects, which are then incorporated into object oriented code in languages like Java or C #.
43.
For example, many virtual synchrony libraries also support tools for building distributed key-value stores, replicating external files or databases, locking or otherwise coordinating the actions of group members, etc.
44.
However, as they push towards higher and higher data rates, taking the server out of the critical performance path becomes important, and with this step, models such as virtual synchrony are potentially valuable.
45.
The central difference between the three models is that virtual synchrony assumes that the variable is replicated " in memory " by a set of processes executing on some collection of machines in a network.
46.
By deviating from the synchronous order, virtual synchrony systems gain speed and improve fault-tolerance ( they are less likely to experience correlated crashes where some message causes all the members to crash simultaneously ).
47.
One widely popular technology in which atomic broadcast is available as a primitive is virtual synchrony, a kind of computing'model'used for fault tolerance and data replication in many real-world systems and products.
48.
For example, the Spread Toolkit supports this same virtual synchrony model and can be used to implement a multi-primary replication scheme; it would also be possible to use C-Ensemble or Quicksilver in this manner.
49.
Recall that a communication layer implementing virtual synchrony must take steps to ensure that every group member sees every message, and has a definition of what these terms mean ( in terms of the temporal model seen earlier ).
50.
For example, in the 1985 87 period, the virtual synchrony model was proposed and emerged as a widely adopted standard ( it was used in the Isis Toolkit, Horus, Transis, Ensemble, Totem, enterprise clustering technology ).
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