support to enable manual BigValueRoute in dynamic config

Summary: Use disable_global_big_value_route to disable creating BigValueRoute in ProxyRoute

Reviewed By: stuclar

Differential Revision: D71217660

fbshipit-source-id: e7eb821024b83c8540b2c5aa069bcc2dd79dc876

Author: disylh

mcrouter/ProxyConfig-inl.h

@@ -133,6 +133,8 @@ ProxyConfig<RouterInfo>::ProxyConfig(
   checkLogic(
       enableSetDistribution || enableCrossRegionSetRpc,
       "ProxyConfig: cannot disable cross-region set rpc if set distribution is disabled");
+  bool enableGlobalBigValueRoute =
+      readBool("enable_global_big_value_route", true);
 
   proxy.router().runtimeFeatures_.enableOdslScuba =
       readBool("enable_odsl_scuba", false);
@@ -151,7 +153,8 @@ ProxyConfig<RouterInfo>::ProxyConfig(
           .enableCrossRegionDeleteRpc = enableCrossRegionDeleteRpc,
           .enableAsyncDlBroadcast = enableAsyncDlBroadcast,
           .enableSetDistribution = enableSetDistribution,
-          .enableCrossRegionSetRpc = enableCrossRegionSetRpc});
+          .enableCrossRegionSetRpc = enableCrossRegionSetRpc,
+          .enableGlobalBigValueRoute = enableGlobalBigValueRoute});
   serviceInfo_ = std::make_shared<ServiceInfo<RouterInfo>>(proxy, *this);
 }
 

mcrouter/routes/ProxyRoute-inl.h

@@ -48,7 +48,8 @@ ProxyRoute<RouterInfo>::ProxyRoute(
           proxy_,
           routeSelectors,
           rolloutOpts)) {
-  if (proxy_.getRouterOptions().big_value_split_threshold != 0) {
+  if (proxy_.getRouterOptions().big_value_split_threshold != 0 &&
+      rolloutOpts.enableGlobalBigValueRoute) {
     root_ = detail::wrapWithBigValueRoute<RouterInfo>(
         std::move(root_), proxy_.getRouterOptions());
   }

mcrouter/routes/RootRoute.h

@@ -32,6 +32,7 @@ struct RootRouteRolloutOpts {
   bool enableAsyncDlBroadcast = false;
   bool enableSetDistribution = false;
   bool enableCrossRegionSetRpc = true;
+  bool enableGlobalBigValueRoute = true;
 };
 
 template <class RouterInfo>