Just to confirm that this problem exists: we upgraded recently from 9.3 to 9.4 using pg_upgrade, having the slave rebuilt as prescribed. Directly after starting up the slave, we started getting the above mentioned error. Replication to this slave works otherwise. Is there a way to get the history file back? -- View this message in context: http://postgresql.nabble.com/Missing-timeline-history-file-after-execution-of-pg-upgrade-tp5826326p5836521.html Sent from the PostgreSQL - admin mailing list archive at Nabble.com. -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin