SERVER-76534 Fix reporting the namespace and UUID in a backup cursor when the changes have not yet been checkpointedr7.0.9-rc1r7.0.9

(cherry picked from commit be9f000e21ff7f97baad57b9ee7c581614089087)
(cherry picked from commit d34d0d6b5b1974394f45faf3187c3560f38a8c3b)

GitOrigin-RevId: 3ff3a3925c36ed277cf5eafca5495f2e3728dd67

1 files changed, 65 insertions, 0 deletions

diff --git a/jstests/hot_backups/backup_restore_metadata.js b/jstests/hot_backups/backup_restore_metadata.js
new file mode 100644
index 00000000000..bfd50f4b791
--- /dev/null
+++ b/jstests/hot_backups/backup_restore_metadata.js
@@ -0,0 +1,65 @@
+/**
+ * Tests that the ident metadata is pulled from the catalog using a checkpoint cursor, if it exists.
+ * Otherwise we fallback to retrieving the ident metadata from the latest catalog as a best guess.
+ *
+ * @tags: [
+ *   requires_persistence,
+ *   requires_replication,
+ * ]
+ */
+(function() {
+"use strict";
+
+const rst = ReplSetTest({
+    nodes: 1,
+    nodeOptions: {
+        setParameter:
+            // Control checkpoints.
+            {"failpoint.pauseCheckpointThread": tojson({mode: "alwaysOn"})}
+    }
+});
+rst.startSet();
+rst.initiate();
+
+let primary = rst.getPrimary();
+let primaryDB = primary.getDB("test");
+
+// Take the initial checkpoint.
+assert.commandWorked(primaryDB.adminCommand({fsync: 1}));
+
+// Create "a" and ensure it is in the checkpoint.
+assert.commandWorked(primaryDB.createCollection("a"));
+assert.commandWorked(primaryDB.adminCommand({fsync: 1}));
+
+// Create "b", which will not be part of the checkpoint used by $backupCursor.
+assert.commandWorked(primaryDB.createCollection("b"));
+
+// Rename "a" to "c". The backup cursor will still report the namespace as "a".
+assert.commandWorked(primaryDB.adminCommand({renameCollection: "test.a", to: "test.c"}));
+
+let namespacesFound = {};
+let backupCursor = primary.getDB("admin").aggregate([{$backupCursor: {}}]);
+while (backupCursor.hasNext()) {
+    let doc = backupCursor.next();
+    jsTestLog(doc);
+
+    if (namespacesFound.hasOwnProperty(doc.ns)) {
+        namespacesFound[doc.ns] += 1;
+    } else {
+        namespacesFound[doc.ns] = 1;
+    }
+}
+
+// Two entries for these namespaces. One for the collection, and one for the _id index.
+assert.eq(2, namespacesFound["test.a"]);
+assert.eq(2, namespacesFound["test.b"]);
+
+// The rename was not part of the checkpoint.
+assert.eq(undefined, namespacesFound["test.c"]);
+
+backupCursor.close();
+
+assert.commandWorked(
+    primary.adminCommand({configureFailPoint: "pauseCheckpointThread", mode: "off"}));
+rst.stopSet();
+})();