1 files changed, 25 insertions, 16 deletions
diff --git a/jstests/parallel/update_serializability2.js b/jstests/parallel/update_serializability2.js
index 76045644f22..878fdec4d37 100644
--- a/jstests/parallel/update_serializability2.js
+++ b/jstests/parallel/update_serializability2.js
@@ -1,23 +1,32 @@
+function test() {
+    "use strict";
+    var t = db.update_serializability1;
+    t.drop();
 
-t = db.update_serializability1;
-t.drop();
+    var N = 100000;
 
-N = 100000;
+    var bulk = t.initializeUnorderedBulkOp()
+    for ( var i = 0; i < N; i++ ) {
+        bulk.insert( { _id : i, a : i, b: N-i, x : 1, y : 1 } );
+    }
+    bulk.execute();
 
-bulk = t.initializeUnorderedBulkOp()
-for ( var i = 0; i < N; i++ ) {
-    bulk.insert( { _id : i, a : i, b: N-i, x : 1, y : 1 } );
-}
-bulk.execute();
+    t.ensureIndex( { a : 1 } );
+    t.ensureIndex( { b : 1 } );
 
-t.ensureIndex( { a : 1 } );
-t.ensureIndex( { b : 1 } );
+    var s1 = startParallelShell( "db.update_serializability1.update( { a : { $gte : 0 } }, { $set : { x : 2 } }, false, true );" );
+    var s2 = startParallelShell( "db.update_serializability1.update( { b : { $lte : " + N + " } }, { $set : { y : 2 } }, false, true );" );
 
-s1 = startParallelShell( "db.update_serializability1.update( { a : { $gte : 0 } }, { $set : { x : 2 } }, false, true );" );
-s2 = startParallelShell( "db.update_serializability1.update( { b : { $lte : " + N + " } }, { $set : { y : 2 } }, false, true );" );
+    s1();
+    s2();
 
-s1();
-s2();
+    // both operations should happen on every document
+    assert.eq( N, t.find( { x : 2, y : 2 } ).count() );
+}
 
-// both operations should happen on every document
-assert.eq( N, t.find( { x : 2, y : 2 } ).count() );
+if (db.serverStatus().storageEngine.name == 'mmapv1') {
+    jsTest.log('skipping test on mmapv1'); // This is only guaranteed on other engines.
+}
+else {
+    test();
+}