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Logical clock
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==Local vs global time== In logical clock systems each process has two data structures: ''logical local time'' and ''logical global time''. Logical local time is used by the process to mark its own events, and logical global time is the local information about global time. A special protocol is used to update logical local time after each local event, and logical global time when processes exchange data.<ref name=ch3>[http://www.cs.uic.edu/~ajayk/Chapter3.pdf Chapter 3: Logical Time] // Ajay Kshemkalyani and Mukesh Singhal, Distributed Computing: Principles, Algorithms, and Systems, Cambridge University Press, 2008</ref>
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