2 files changed, 60 insertions, 0 deletions
diff --git a/jstests/disk/libs/wt_file_helper.js b/jstests/disk/libs/wt_file_helper.js
index 862d189c85d..5fe8b299cb3 100644
--- a/jstests/disk/libs/wt_file_helper.js
+++ b/jstests/disk/libs/wt_file_helper.js
@@ -234,3 +234,16 @@ let truncateUriAndRestartMongod = function(uri, conn, mongodOptions) {
     runWiredTigerTool("-h", conn.dbpath, "truncate", uri);
     return startMongodOnExistingPath(conn.dbpath, mongodOptions);
 };
+
+/**
+ * Stops the given mongod and runs the alter command to modify the index table's metadata.
+ */
+let alterIndexFormatVersion = function(uri, conn, formatVersion) {
+    MongoRunner.stopMongod(conn, null, {skipValidation: true});
+    runWiredTigerTool(
+        "-h",
+        conn.dbpath,
+        "alter",
+        "table:" + uri,
+        "app_metadata=(formatVersion=" + formatVersion + "),exclusive_refreshed=false");
+};
diff --git a/jstests/disk/repair_index_format_version.js b/jstests/disk/repair_index_format_version.js
new file mode 100644
index 00000000000..46922a98b09
--- /dev/null
+++ b/jstests/disk/repair_index_format_version.js
@@ -0,0 +1,47 @@
+/**
+ * Tests that mismatch of index type and index format version will be resolved during startup.
+ */
+
+(function() {
+
+load('jstests/disk/libs/wt_file_helper.js');
+
+const baseName = "repair_index_format_version";
+const collNamePrefix = "test_";
+let count = 0;
+const dbpath = MongoRunner.dataPath + baseName + "/";
+
+resetDbpath(dbpath);
+
+jsTestLog("Repair the format version of a unique index.");
+
+// Uses the modified data files in the same dbpath over restarts.
+let mongod = startMongodOnExistingPath(dbpath);
+let db = mongod.getDB(baseName);
+let collName = collNamePrefix + count++;
+db.createCollection(collName);
+let testColl = db[collName];
+assert.commandWorked(testColl.createIndex({a: 1}, {unique: true}));
+
+let uri = getUriForIndex(testColl, "a_1");
+alterIndexFormatVersion(uri, mongod, 8);
+
+mongod = startMongodOnExistingPath(dbpath);
+checkLog.containsJson(mongod, 6818600);
+
+jsTestLog("Repair the format version of a non-unique index.");
+
+db = mongod.getDB(baseName);
+collName = collNamePrefix + count++;
+db.createCollection(collName);
+testColl = db[collName];
+assert.commandWorked(testColl.createIndex({b: 1}));
+
+uri = getUriForIndex(testColl, "b_1");
+alterIndexFormatVersion(uri, mongod, 14);
+
+mongod = startMongodOnExistingPath(dbpath);
+checkLog.containsJson(mongod, 6818600);
+
+MongoRunner.stopMongod(mongod, null, {skipValidation: true});
+})();