Distributed systemTwo generals problem and ATM machines Suppose you want your ATM to give you $100. and ATM has two separate processing steps: it must record a debit for $100 and it must give you the cash. By the two generals problem, it cannot do both at the same time. It can do these steps in either order and a crash can occur any time. – Suppose it gives you the cash first. What can go wrong? – Suppose it does the debit first. What can go wrong? How the problem might eventually be fixed. – Based on your analysis, which option would banks choose?
Distributed systemTwo generals problem and ATM machines Suppose you want your ATM to give you $100. and ATM has two separate processing steps: it must record a debit for $100 and it must give you the cash. By the two generals problem, it cannot do both at the same time. It can do these steps in either order and a crash can occur any time. – Suppose it gives you the cash first. What can go wrong? – Suppose it does the debit first. What can go wrong? How the problem might eventually be fixed. – Based on your analysis, which option would banks choose?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Distributed system
Two generals problem and ATM machines
Suppose you want your ATM to give you $100. and ATM has two separate processing steps:
it must record a debit for $100 and it must give you the cash.
By the two generals problem, it cannot do both at the same time. It can do these steps in either order and a crash can occur any time.
– Suppose it gives you the cash first. What can go wrong?
– Suppose it does the debit first. What can go wrong? How the problem might
eventually be fixed.
– Based on your analysis, which option would banks choose?
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