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A vector clock of a system of N processes is an array/vector of N logical clocks, one clock per process; a local "largest possible values" copy of the global clock-array is kept in each process. Denote V C i {\displaystyle VC_{i}} as the vector clock maintained by process i {\displaystyle i} , the clock updates proceed as follows: [ 1 ]
Date/Time Thumbnail Dimensions User Comment; current: 03:57, 19 September 2006: 725 × 410 (27 KB): Nae'blis == Summary == Diagram of the Vector Clocks algorithm, translated from the German Wikipedia equivalent by D. Düsentrieb Originally translated at en:Image:VectorClock.svg, document edge trimmed of excessive whitespace and uploaded to commons.
The Lamport timestamp algorithm is a simple logical clock algorithm used to determine the order of events in a distributed computer system.As different nodes or processes will typically not be perfectly synchronized, this algorithm is used to provide a partial ordering of events with minimal overhead, and conceptually provide a starting point for the more advanced vector clock method.
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Some noteworthy logical clock algorithms are: Lamport timestamps, which are monotonically increasing software counters. Vector clocks, that allow for partial ordering of events in a distributed system. Version vectors, order replicas, according to updates, in an optimistic replicated system.
Unlike Lampert-Clocks the clock of every process consists not only of a single counter but of a vector (or an array / associative list) of counters: every keeps track of the counter value of all other processes (to the extent these are known). The current value of the clock is attached to every emitted message.
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A version vector is a mechanism for tracking changes to data in a distributed system, where multiple agents might update the data at different times.The version vector allows the participants to determine if one update preceded another (happened-before), followed it, or if the two updates happened concurrently (and therefore might conflict with each other).