SERVER-21488 insert into indexed capped collections one-at-a-time

1 files changed, 24 insertions, 0 deletions

diff --git a/jstests/core/bulk_insert_capped.js b/jstests/core/bulk_insert_capped.js
new file mode 100644
index 00000000000..70edf98ca4e
--- /dev/null
+++ b/jstests/core/bulk_insert_capped.js
@@ -0,0 +1,24 @@
+// SERVER-21488 Test that multi inserts into capped collections don't cause corruption.
+// Note: this file must have a name that starts with "bulk" so it gets run by bulk_gle_passthrough.
+(function() {
+    "use strict";
+    var t = db.capped_multi_insert;
+    t.drop();
+
+    db.createCollection(t.getName(), {capped: true, size: 16*1024, max: 1});
+
+    t.insert([{_id:1}, {_id:2}]);
+    assert.gleSuccess(db);
+
+    // Ensure the collection is valid.
+    var res = t.validate(true);
+    assert(res.valid, tojson(res));
+    
+    // Ensure that various ways of iterating the collection only return one document.
+    assert.eq(t.find().itcount(), 1); // Table scan.
+    assert.eq(t.find({}, {_id: 1}).hint({_id: 1}).itcount(), 1); // Index only (covered).
+    assert.eq(t.find().hint({_id: 1}).itcount(), 1); // Index scan with fetch.
+
+    // Ensure that the second document is the one that is kept.
+    assert.eq(t.findOne(), {_id: 2});
+}());