It turned out that many companies decided to rename the architectural pattern master/slave in their documentation due to its negative connotation. “Primary” and “Replica” are used in the documentation of IBM, Microsoft, Amazon Web Services, ACM, Python, Django, Drupal, CouchDB, Redis, and MediaWiki (the latter decided not to abandon “master”).
Update: I think it’s because in a true master-slave setup, only the slaves should work, while something like a zookeeper would be on the master.
Hi, I'm Rauf Aliev. 