1. Consider this situation: you try to get
cash at an ATM, but the ATM fails after updating your account and
committing, but just before cash is dispensed. As a system
designer, how do you cope with the situation that the money has been debited
from the account and committed but the cash was unable to be dispensed? [
hint: what do you think “compensating transaction” means? do a google search.]
2. Consider this situation: you
try to buy an airline ticket at a web site. The transaction commits on
the server, but crashes just before the message confirming the reservation is
sent to the client. As a system
designer, how would you cope with the situation of a reservation was made and
committed in the database, but the confirmation message was never received by
the client?
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cash at an ATM, but the ATM fails af appeared first on blitzarchive.com.