diff options
Diffstat (limited to 'src/backend/replication/slot.c')
| -rw-r--r-- | src/backend/replication/slot.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c index aff100b192a..533e28dc238 100644 --- a/src/backend/replication/slot.c +++ b/src/backend/replication/slot.c @@ -797,6 +797,11 @@ ReplicationSlotsCountDBSlots(Oid dboid, int *nslots, int *nactive) void CheckSlotRequirements(void) { + /* + * NB: Adding a new requirement likely means that RestoreSlotFromDisk() + * needs the same check. + */ + if (max_replication_slots == 0) ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), @@ -1238,6 +1243,31 @@ RestoreSlotFromDisk(const char *name) return; } + /* + * Verify that requirements for the specific slot type are met. That's + * important because if these aren't met we're not guaranteed to retain + * all the necessary resources for the slot. + * + * NB: We have to do so *after* the above checks for ephemeral slots, + * because otherwise a slot that shouldn't exist anymore could prevent + * restarts. + * + * NB: Changing the requirements here also requires adapting + * CheckSlotRequirements() and CheckLogicalDecodingRequirements(). + */ + if (cp.slotdata.database != InvalidOid && wal_level < WAL_LEVEL_LOGICAL) + ereport(FATAL, + (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), + errmsg("logical replication slots \"%s\" exists, but wal_level < logical", + NameStr(cp.slotdata.name)), + errhint("Change wal_level to be replica or higher."))); + else if (wal_level < WAL_LEVEL_ARCHIVE) + ereport(FATAL, + (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), + errmsg("physical replication slots \"%s\" exists, but wal_level < archive", + NameStr(cp.slotdata.name)), + errhint("Change wal_level to be archive or higher."))); + /* nothing can be active yet, don't lock anything */ for (i = 0; i < max_replication_slots; i++) { |