From bc12c677d4a2e10d6a35f540b0e0182f9b8b0545 Mon Sep 17 00:00:00 2001 From: Jim Jones Date: Sun, 18 Oct 2026 14:07:37 +0200 Subject: [PATCH v1 2/4] pgrowlocks: Reject unlogged tables during recovery Unlogged tables have no data on a standby, so reading one there must fail. pgrowlocks() reads the table directly instead of going through the planner, so on a standby it failed with a confusing low-level message instead of the error that SELECT reports: ERROR: could not open file "base/5/16384": No such file or directory Check for this case and report the same error as SELECT: ERROR: cannot access temporary or unlogged relations during recovery Author: Jim Jones Reported-by: Zsolt Parragi --- contrib/pgrowlocks/pgrowlocks.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/contrib/pgrowlocks/pgrowlocks.c b/contrib/pgrowlocks/pgrowlocks.c index 87bbde59937..84017271e98 100644 --- a/contrib/pgrowlocks/pgrowlocks.c +++ b/contrib/pgrowlocks/pgrowlocks.c @@ -29,6 +29,7 @@ #include "access/relscan.h" #include "access/tableam.h" #include "access/xact.h" +#include "access/xlog.h" #include "catalog/namespace.h" #include "catalog/pg_am_d.h" #include "catalog/pg_authid.h" @@ -114,6 +115,12 @@ pgrowlocks(PG_FUNCTION_ARGS) aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind), RelationGetRelationName(rel)); + /* Temporary and unlogged relations are inaccessible during recovery. */ + if (!RelationIsPermanent(rel) && RecoveryInProgress()) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("cannot access temporary or unlogged relations during recovery"))); + /* Scan the relation */ scan = table_beginscan(rel, GetActiveSnapshot(), 0, NULL, SO_NONE); hscan = (HeapScanDesc) scan; -- 2.56.0