[abadid]

The assumption is that the data partitions are disjoint. Each worker controls its own data and therefore controls what value the other workers see. So the worker is responsible for making sure the other workers read the correct version.

[angry_octet]

How can it possibly know which is the correct version if it doesn't know what other workers have processed?

[magicalhippo]

My assumption reading the article was that each transaction is assigned a unique id. Then a worker could ask another worker for "y for/as of transaction 42".

Maybe I'm all wrong tho.

[abadid]

What you say is correct :)