masudio - tech

Isn't it true you can just write deterministic code and if you do it right and work to fix all the bugs, eventually you'll have a simple that never does the wrong thing?  If that's not the case then why not?  Computers are deterministic - they're predictable and they only ever do exactly what you ask them to do and nothing more...right? It's complicated. On a single node (computer) most failures mean the entire node completely stops working - for example the power supply fails, the disk dies, or the motherboard gets fried.  These types of failures are easy to detect because the node won't be in a 'partially failed' state where sometimes it performs the functions it's asked and sometimes it doesn't. In a network, you have multiple nodes - possibly hundreds or thousands.  When one node fails, it is impossible to be 100% sure that node is completely down.  And if you can't be sure that a node won't come back to life, then you can...