xds: fix clusterImplLoadBalancer NPE when lrs is null (#8713)

grpc · Nov 18, 2021 · 8382bd8 · 8382bd8
1 parent dd0db6c
commit 8382bd8
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/xds/src/main/java/io/grpc/xds/ClusterImplLoadBalancer.java b/xds/src/main/java/io/grpc/xds/ClusterImplLoadBalancer.java
@@ -319,9 +319,11 @@ public PickResult pickSubchannel(PickSubchannelArgs args) {
           }
           final ClusterLocalityStats stats =
               result.getSubchannel().getAttributes().get(ATTR_CLUSTER_LOCALITY_STATS);
-          ClientStreamTracer.Factory tracerFactory = new CountingStreamTracerFactory(
-              stats, inFlights, result.getStreamTracerFactory());
-          return PickResult.withSubchannel(result.getSubchannel(), tracerFactory);
+          if (stats != null) {
+            ClientStreamTracer.Factory tracerFactory = new CountingStreamTracerFactory(
+                stats, inFlights, result.getStreamTracerFactory());
+            return PickResult.withSubchannel(result.getSubchannel(), tracerFactory);
+          }
         }
         return result;
       }