SERVER-46607 ignore MaxTimeMSExpire error on hedged reads

(cherry picked from commit a924cde8580dd00409a0c8296e81ff73709ad1a2)

1 files changed, 55 insertions, 0 deletions

diff --git a/jstests/sharding/hedged_reads.js b/jstests/sharding/hedged_reads.js
new file mode 100644
index 00000000000..76fd6e59a56
--- /dev/null
+++ b/jstests/sharding/hedged_reads.js
@@ -0,0 +1,55 @@
+/*
+ * Tests hedging metrics in the serverStatus output.
+ * @tags: [requires_fcv_44]
+ */
+(function() {
+"use strict";
+
+function setCommandDelay(nodeConn, command, delay) {
+    assert.commandWorked(nodeConn.adminCommand({
+        configureFailPoint: "failCommand",
+        mode: "alwaysOn",
+        data: {
+            failInternalCommands: true,
+            blockConnection: true,
+            blockTimeMS: delay,
+            failCommands: [command],
+        }
+    }));
+}
+
+function clearCommandDelay(nodeConn) {
+    assert.commandWorked(nodeConn.adminCommand({
+        configureFailPoint: "failCommand",
+        mode: "off",
+    }));
+}
+
+const st = new ShardingTest({shards: 2, rs: {nodes: 2}});
+const dbName = "foo";
+const collName = "bar";
+const ns = dbName + "." + collName;
+const testDB = st.s.getDB(dbName);
+
+assert.commandWorked(st.s.adminCommand({enableSharding: dbName}));
+st.ensurePrimaryShard(dbName, st.shard0.shardName);
+
+// Verify that MaxTimeMS expiration does not affect the command result.
+try {
+    setCommandDelay(st.rs0.getPrimary(), "find", 500);
+
+    // the hedged read will have the MaxTimeMS set to 10ms, hence need to sleep longer than that.
+    assert.commandWorked(testDB.runCommand({
+        query: {
+            find: collName,
+            filter: {$where: "sleep(100); return true;"},
+            $readPreference: {mode: "nearest"}
+        }
+    }));
+
+} finally {
+    clearCommandDelay(st.rs0.getPrimary());
+}
+
+st.stop();
+}());