SERVER-23590 add background index build test

Tests that indexes are properly updated when updates are performed during a
background index scan.

This test is disabled for now and will be re-enabled in SERVER-23695.

1 files changed, 65 insertions, 0 deletions

diff --git a/jstests/noPassthroughWithMongod/indexbg_updates.js b/jstests/noPassthroughWithMongod/indexbg_updates.js
new file mode 100644
index 00000000000..37bc9b325fe
--- /dev/null
+++ b/jstests/noPassthroughWithMongod/indexbg_updates.js
@@ -0,0 +1,65 @@
+// Perform concurrent updates with a background index build, testing that
+// indexes are updated appropriately. See SERVER-23590 and SERVER-22970.
+//
+// Variation of index_multi.js
+
+(function() {
+    "use strict";
+    Random.setRandomSeed();
+
+    var coll = db.getSiblingDB("indexbg_updates").coll;
+    coll.drop();
+
+    var numDocs = 10000;
+
+    var bulk = coll.initializeUnorderedBulkOp();
+    print("Populate the collection with random data");
+    for (var i = 0; i < numDocs; i++) {
+        var doc = {
+            "_id": i,
+            "field0": Random.rand()
+        };
+
+        bulk.insert(doc);
+    }
+    assert.writeOK(bulk.execute());
+
+    // Perform a bulk update on a single document, targeting the updates on the
+    // field being actively indexed in the background
+    bulk = coll.initializeUnorderedBulkOp();
+    for (i = 0; i < numDocs; i++) {
+        var criteria = {
+            "_id": 1000
+        };
+        var mod = {};
+
+        if (Random.rand() < .8) {
+            mod["$set"] = {};
+            mod["$set"]["field0"] = Random.rand();
+        } else {
+            mod["$unset"] = {};
+            mod["$unset"]["field0"] = true;
+        }
+
+        bulk.find(criteria).update(mod);
+    }
+
+    // Build an index in the background on field0
+    var backgroundIndexBuildShell = startParallelShell(
+        function() {
+            var coll = db.getSiblingDB("indexbg_updates").coll;
+            assert.commandWorked(coll.createIndex({ "field0": 1 }, { "background": true }));
+        },
+        null,   // port -- use default
+        false   // noconnect
+    );
+
+    print("Do some sets and unsets");
+    assert.writeOK(bulk.execute());
+
+    print("Start background index build");
+    backgroundIndexBuildShell();
+
+    var explain = coll.find().hint({ "field0": 1 }).explain();
+    assert("queryPlanner" in explain, tojson(explain));
+}());