The site on WP is built by a star: one Center with admin panel and MySQL master, and a pool of several Nodes with MySQL slaves, without admin panel - only for page output.
On the nodes is WP Super Cache, which saves rendered pages in static html files. It works in the "requested page - created its cache, if not yet." Those. The set of cached pages on different nodes is different.
The question is: is it worth it at the file level to synchronize these cached pages between nodes, or let each node flip up on its own?
Another possible scenario is to forcibly generate the cache of all pages on the site on the Center server, and from there merge onto all the Nodes. Then it is not obvious why they are needed at all. Only if all visitors take in heading simultaneously to search the site intensively 6)
Upd. One more thing became clear: after all, when updating the post, the MySQL push goes to the Nodes, but no WP event is started, and the cache for the updated record is not rebuilt. While I "fly" this is a short cache lifetime.
