1 files changed, 43 insertions, 0 deletions
diff --git a/contrib/test_decoding/specs/ondisk_startup.spec b/contrib/test_decoding/specs/ondisk_startup.spec
new file mode 100644
index 00000000000..39c4a223aee
--- /dev/null
+++ b/contrib/test_decoding/specs/ondisk_startup.spec
@@ -0,0 +1,43 @@
+# Force usage of ondisk decoding snapshots to test that code path.
+setup
+{
+    DROP TABLE IF EXISTS do_write;
+    CREATE TABLE do_write(id serial primary key);
+}
+
+teardown
+{
+    DROP TABLE do_write;
+    SELECT 'stop' FROM pg_drop_replication_slot('isolation_slot');
+}
+
+
+session "s1"
+setup { SET synchronous_commit=on; }
+
+step "s1init" {SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding');}
+step "s1start" {SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');}
+step "s1insert" { INSERT INTO do_write DEFAULT VALUES; }
+step "s1checkpoint" { CHECKPOINT; }
+step "s1alter" { ALTER TABLE do_write ADD COLUMN addedbys1 int; }
+
+session "s2"
+setup { SET synchronous_commit=on; }
+
+step "s2txid" { BEGIN ISOLATION LEVEL REPEATABLE READ; SELECT txid_current() IS NULL; }
+step "s2alter" { ALTER TABLE do_write ADD COLUMN addedbys2 int; }
+step "s2c" { COMMIT; }
+
+
+session "s3"
+setup { SET synchronous_commit=on; }
+
+step "s3txid" { BEGIN ISOLATION LEVEL REPEATABLE READ; SELECT txid_current() IS NULL; }
+step "s3c" { COMMIT; }
+
+# Force usage of ondisk snapshot by starting and not finishing a
+# transaction with a assigned xid after consistency has been
+# reached. In combination with a checkpoint forcing a snapshot to be
+# written and a new restart point computed that'll lead to the usage
+# of the snapshot.
+permutation "s2txid" "s1init" "s3txid" "s2alter" "s2c" "s1insert" "s1checkpoint" "s1start" "s1insert" "s1alter" "s1insert" "s1start"