SERVER-26287 Disallow creation of TTL indexes on capped collections

1 files changed, 22 insertions, 0 deletions

diff --git a/jstests/noPassthroughWithMongod/ttl_index_capped_collection_fails.js b/jstests/noPassthroughWithMongod/ttl_index_capped_collection_fails.js
new file mode 100644
index 00000000000..18ce357341f
--- /dev/null
+++ b/jstests/noPassthroughWithMongod/ttl_index_capped_collection_fails.js
@@ -0,0 +1,22 @@
+/**
+ * Tests that attempting to create a TTL index on a capped collection will fail.
+ */
+
+(function() {
+"use strict";
+
+// Ensure that on an uncapped collection, both non-TTL and TTL indexes can be created
+const uncappedColl = db.getCollection(jsTestName() + "_uncapped");
+uncappedColl.drop();
+assert.commandWorked(db.createCollection(uncappedColl.getName(), {capped: false}));
+assert.commandWorked(uncappedColl.createIndex({foo: 1}));
+assert.commandWorked(uncappedColl.createIndex({bar: 1}, {expireAfterSeconds: 10}));
+
+// Ensure that on a capped collection, a TTL index cannot be created.
+const cappedColl = db.getCollection(jsTestName() + "_capped");
+cappedColl.drop();
+assert.commandWorked(db.createCollection(cappedColl.getName(), {capped: true, size: 102400}));
+assert.commandWorked(cappedColl.createIndex({foo: 1}));
+assert.commandFailedWithCode(cappedColl.createIndex({bar: 1}, {expireAfterSeconds: 10}),
+                             ErrorCodes.CannotCreateIndex);
+})();
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