1 files changed, 33 insertions, 0 deletions
diff --git a/jstests/noPassthroughWithMongod/query_stats_configuration.js b/jstests/noPassthroughWithMongod/query_stats_configuration.js
new file mode 100644
index 00000000000..544fa63bc6d
--- /dev/null
+++ b/jstests/noPassthroughWithMongod/query_stats_configuration.js
@@ -0,0 +1,33 @@
+/**
+ * Tests that the telemetry store can be resized if it is configured, and cannot be resized if it is
+ * disabled.
+ */
+(function() {
+"use strict";
+
+load("jstests/libs/feature_flag_util.js");
+
+if (FeatureFlagUtil.isEnabled(db, "QueryStats")) {
+    function testTelemetrySetting(paramName, paramValue) {
+        // The feature flag is enabled - make sure the telemetry store can be configured.
+        const original = assert.commandWorked(db.adminCommand({getParameter: 1, [paramName]: 1}));
+        assert(original.hasOwnProperty(paramName), original);
+        const originalValue = original[paramName];
+        try {
+            assert.doesNotThrow(() => db.adminCommand({setParameter: 1, [paramName]: paramValue}));
+            // Other tests verify that changing the parameter actually affects the behavior.
+        } finally {
+            assert.doesNotThrow(() =>
+                                    db.adminCommand({setParameter: 1, [paramName]: originalValue}));
+        }
+    }
+    testTelemetrySetting("internalQueryStatsCacheSize", "2MB");
+    testTelemetrySetting("internalQueryStatsSamplingRate", 2147483647);
+} else {
+    // The feature flag is disabled - make sure the telemetry store *cannot* be configured.
+    assert.commandFailedWithCode(
+        db.adminCommand({setParameter: 1, internalQueryStatsCacheSize: '2MB'}), 7373500);
+    assert.commandFailedWithCode(
+        db.adminCommand({setParameter: 1, internalQueryStatsSamplingRate: 2147483647}), 7506200);
+}
+}());