Comment Re: Propagation takes time! (Score -1) 22
Because you are only accessing a 'local' node and the change is applied instantly because you are connected to where the change occurs.
If you VPN to some other geographic location far away in their hierarchy, your account may not be available for some time.
It also may get updated quickly to start with, but then its cached and tge cache will exist for some time until it expires.
The cache could potentially be cleared, but when there are potentially millions of cache locations it could be in, you arent purging them all instantly.
Large distributed systems hide ALL of this from you by alway directing you to the same group/cluster where cache can be managed efficiently without global performance impacts.