Causal consistency.

also: causally consistent

Operations that are causally related (a reply after the post it answers) are seen in that order by everyone; concurrent ones may differ.

the two-minute refresher

A happens before B if same process A first, if B reads A's write, or transitively.
Nobody sees a reply before the message it replies to.
Concurrent, unrelated operations may appear in different orders on different nodes.
Tracked with dependency metadata such as vector clocks.

also: causally consistent

Operations that are causally related (a reply after the post it answers) are seen in that order by everyone; concurrent ones may differ.

A happens before B if same process A first, if B reads A's write, or transitively.
Nobody sees a reply before the message it replies to.
Concurrent, unrelated operations may appear in different orders on different nodes.
Tracked with dependency metadata such as vector clocks.