Merge pull request #2825 from murgatroid99/grpc-js_round_robin_reresolve

grpc-js: round_robin: Request resolution on connection drop

Author: murgatroid99

packages/grpc-js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@grpc/grpc-js",
-  "version": "1.11.2",
+  "version": "1.11.3",
   "description": "gRPC Library for Node - pure JS implementation",
   "homepage": "https://grpc.io/",
   "repository": "https://github.com/grpc/grpc-node/tree/master/packages/grpc-js",

packages/grpc-js/src/load-balancer-round-robin.ts

@@ -110,6 +110,13 @@ export class RoundRobinLoadBalancer implements LoadBalancer {
       channelControlHelper,
       {
         updateState: (connectivityState, picker) => {
+          /* Ensure that name resolution is requested again after active
+           * connections are dropped. This is more aggressive than necessary to
+           * accomplish that, so we are counting on resolvers to have
+           * reasonable rate limits. */
+          if (this.currentState === ConnectivityState.READY && connectivityState !== ConnectivityState.READY) {
+            this.channelControlHelper.requestReresolution();
+          }
           this.calculateAndUpdateState();
         },
       }