Disable new PickFirstLB

Author: larry-safran

core/src/main/java/io/grpc/internal/PickFirstLoadBalancerProvider.java

@@ -38,7 +38,7 @@ public final class PickFirstLoadBalancerProvider extends LoadBalancerProvider {
   private static final String SHUFFLE_ADDRESS_LIST_KEY = "shuffleAddressList";
 
   static boolean enableNewPickFirst =
-      GrpcUtil.getFlag("GRPC_EXPERIMENTAL_ENABLE_NEW_PICK_FIRST", true);
+      GrpcUtil.getFlag("GRPC_EXPERIMENTAL_ENABLE_NEW_PICK_FIRST", false);
 
   public static boolean isEnabledHappyEyeballs() {
     return GrpcUtil.getFlag(GRPC_EXPERIMENTAL_XDS_DUALSTACK_ENDPOINTS, false);

xds/src/test/java/io/grpc/xds/RingHashLoadBalancerTest.java

@@ -446,7 +446,8 @@ public void skipFailingHosts_pickNextNonFailingHost() {
     assertThat(result.getStatus().isOk()).isTrue();
     assertThat(result.getSubchannel()).isNull();  // buffer request
     int expectedTimes = PickFirstLoadBalancerProvider.isEnabledHappyEyeballs() ? 1 : 2;
-    verify(getSubChannel(servers.get(1)), times(expectedTimes)).requestConnection();  // kicked off connection to server2
+    // verify kicked off connection to server2
+    verify(getSubChannel(servers.get(1)), times(expectedTimes)).requestConnection();
     assertThat(subchannels.size()).isEqualTo(2);  // no excessive connection
 
     deliverSubchannelState(getSubChannel(servers.get(1)), CSI_CONNECTING);