SERVER-31953 Target secondary application of updates and deletes by just _id

1 files changed, 30 insertions, 0 deletions

diff --git a/jstests/sharding/replication_with_undefined_shard_key.js b/jstests/sharding/replication_with_undefined_shard_key.js
new file mode 100644
index 00000000000..8e37c171735
--- /dev/null
+++ b/jstests/sharding/replication_with_undefined_shard_key.js
@@ -0,0 +1,30 @@
+// Test for SERVER-31953 where secondaries crash when replicating an oplog entry where the document
+// identifier in the oplog entry contains a shard key value that contains an undefined value.
+(function() {
+    "use strict";
+
+    const st = new ShardingTest({mongos: 1, config: 1, shard: 1, rs: {nodes: 2}});
+    const mongosDB = st.s.getDB("test");
+    const mongosColl = mongosDB.mycoll;
+
+    // Shard the test collection on the "x" field.
+    assert.commandWorked(mongosDB.adminCommand({enableSharding: mongosDB.getName()}));
+    assert.commandWorked(mongosDB.adminCommand({
+        shardCollection: mongosColl.getFullName(),
+        key: {x: 1},
+    }));
+
+    // Insert a document with a literal undefined value.
+    assert.writeOK(mongosColl.insert({x: undefined}));
+
+    jsTestLog("Doing writes that generate oplog entries including undefined document key");
+
+    assert.writeOK(mongosColl.update(
+        {},
+        {$set: {a: 1}},
+        {multi: true, writeConcern: {w: 2, wtimeout: ReplSetTest.kDefaultTimeoutMs}}));
+    assert.writeOK(
+        mongosColl.remove({}, {writeConcern: {w: 2, wtimeout: ReplSetTest.kDefaultTimeoutMs}}));
+
+    st.stop();
+})();
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