"A characteristic of group communication that we have alluded to several times is the all-or-nothing property. Most group communication systems are designed so that when a message is sent to a group, it will either arrive correctly at all members of the group, or at none of them. Situations in which some members receive a message and others do not are not permitted. The property of all-or-nothing delivery is called atomicity or atomic broadcast." - Modern operating systems, Andrew S. Tanenbaum.
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