Fencing a node that doesn't know it's dead: pgrac build log #2 (opens in new tab)

pgrac is an open attempt to rebuild Oracle RAC's core machinery (shared-everything storage, multiple active nodes all writing one database, a cluster-wide change number) on top of PostgreSQL 16. Build log #1 laid out the four problems that fight back. This one is about the problem that turns a node failure into silent data corruption, and the first, deliberately modest, layer pgrac ships against it. The failure mode In a shared-nothing cluster an evicted node is mostly harmless: it owns its o...