¿Qué es Reproducible result, data snapshot, content-addressed storage, pipeline stage, environment lock?

A reproducible result is one that the same data, code and settings produce again, bit for bit (Book 4, chapter 25), a minimum standard when an independent replication is not possible (Peng). A data snapshot is an immutable copy of the data as used, identified by its content. Content-addressed storage stores each object under the hash of its content, so that the same content has the same address and different content cannot share one (Git’s object store is the familiar example). A pipeline stage is a function of its inputs, parameters and seed, with no other source of variation. An environment lock records the exact versions of the interpreter and libraries a result was produced with.