Re:Bye Bye Mongo, Hello Postgres
by ownagefool on Thursday December 20, 2018 @06:05AM
(#18723918)
This likely isn't true for banking systems.
Many ATMs will still give you money when they're offline, and things become eventually consistent by comparing the ledger.
Shops also generally want to take orders and payments irregardless of the network availability, so whilst they might generally act as CP systems, they'll be AP in the event of network downtime, but will likely lose access to fraud checks, so may put limits of purchases, etc.
They're probably all CP locally and AP (or switchable from CP) from an entire system perspective.
Many ATMs will still give you money when they're offline, and things become eventually consistent by comparing the ledger.
Shops also generally want to take orders and payments irregardless of the network availability, so whilst they might generally act as CP systems, they'll be AP in the event of network downtime, but will likely lose access to fraud checks, so may put limits of purchases, etc.
They're probably all CP locally and AP (or switchable from CP) from an entire system perspective.