Merge pull request #2564 from murgatroid99/grpc-js_ping_first_equality_check_backport

grpc-js: Fix pick-first-load-balancer pick subchannel lost state listener (1.9.x)

Author: murgatroid99

packages/grpc-js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@grpc/grpc-js",
-  "version": "1.9.1",
+  "version": "1.9.2",
   "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-pick-first.ts

@@ -315,7 +315,7 @@ export class PickFirstLoadBalancer implements LoadBalancer {
   }
 
   private pickSubchannel(subchannel: SubchannelInterface) {
-    if (subchannel === this.currentPick) {
+    if (this.currentPick && subchannel.realSubchannelEquals(this.currentPick)) {
       return;
     }
     trace('Pick subchannel with address ' + subchannel.getAddress());