SERVER-36968 Rebuild interrupted system indexes before checking AuthZN index presence

1 files changed, 56 insertions, 0 deletions

diff --git a/jstests/auth/rebuild_system_indexes.js b/jstests/auth/rebuild_system_indexes.js
new file mode 100644
index 00000000000..76ccd52c5a1
--- /dev/null
+++ b/jstests/auth/rebuild_system_indexes.js
@@ -0,0 +1,56 @@
+/**
+ * This test verifies that the server will attempt to rebuild admin.system.users index on startup if
+ * it is in a partially built state using the mmapv1 storage engine.
+ *
+ * @tags: [requires_journaling, requires_mmapv1]
+ */
+(() => {
+    "use strict";
+
+    const dbpath = "rebuild_system_indexes";
+    const user = 'admin';
+    const pwd = 'adminPassword';
+
+    const mongod = MongoRunner.runMongod({storageEngine: 'mmapv1', dbpath});
+
+    let admin = mongod.getDB('admin');
+
+    // Create the system.users index
+    assert.commandWorked(
+        admin.runCommand({createUser: user, pwd, roles: [{role: 'root', db: 'admin'}]}),
+        'failed to create user/indexes');
+    assert.commandWorked(admin.runCommand({deleteIndexes: 'system.users', index: '*'}),
+                         'failed to drop indexes');
+
+    MongoRunner.stopMongod(mongod);
+
+    // Add a fail point so the server crashes while rebuilding the indexes
+    print('================= starting mongod that WILL CRASH PURPOSEFULLY =================');
+    MongoRunner.runMongod({
+        restart: mongod,
+        storageEngine: 'mmapv1',
+        setParameter: "failpoint.crashAfterStartingIndexBuild={mode: 'alwaysOn'}", dbpath,
+    });
+    print('======================== END PURPOSEFUL CRASH ========================');
+
+    // Make sure the server isnt running
+    assert.neq(0,
+               runMongoProgram('mongo', '--port', mongod.port, '--eval', 'db.isMaster()'),
+               "mongod did not crash when creating index");
+
+    // Start up normally, indexes should be rebuilt
+    MongoRunner.runMongod({
+        restart: mongod,
+        storageEngine: 'mmapv1',
+        setParameter: "failpoint.crashAfterStartingIndexBuild={mode: 'off'}", dbpath,
+    });
+
+    assert(mongod);
+
+    admin = mongod.getDB('admin');
+    admin.auth(user, pwd);
+
+    assert(admin.getCollection('system.users').getIndexes().length > 1, 'indexes were not rebuilt');
+
+    MongoRunner.stopMongod(mongod);
+})();