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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
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
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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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