| 11. | Ken Birman developed the virtual synchrony model in a series of papers published between 1985 and 1987.
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| 12. | Partly this relates to ordering : virtual synchrony often weakens the message delivery ordering to gain performance.
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| 13. | Virtual synchrony was first supported by the Cornell University and was called the " Isis Toolkit ".
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| 14. | Yet virtual synchrony lets the user treat failure notifications ( view changes ) as trustworthy, infallible events.
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| 15. | Virtual synchrony is useful for more than just replicating data, although replication is probably the most common use.
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| 16. | In virtual synchrony systems, the application programmer signals to the platform what form of ordering is really needed.
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| 17. | Virtual synchrony is usually presented to programmers through a simple distributed programming library that supports at least three basic interfaces.
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| 18. | Experience with virtual synchrony shows that for most applications, the weak but fast form of delivery is just fine.
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| 19. | Using the virtual synchrony model, it is relatively easy to maintain fault-tolerant replicated data in a consistent state.
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| 20. | But the other sense in which virtual synchrony is a weaker model relates to exactly what happens when some process crashes.
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