sjvanrossum commented on code in PR #31608:
URL: https://github.com/apache/beam/pull/31608#discussion_r2060274789


##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubUnboundedSink.java:
##########
@@ -201,8 +206,15 @@ public void processElement(
           break;
       }
 
+      // TODO(sjvanrossum): https://github.com/apache/beam/issues/31828
+      // NOTE: Null and empty ordering keys are treated as equivalent.
       @Nullable String topic = dynamicTopicFn.apply(element);
-      K key = 
keyFunction.apply(ThreadLocalRandom.current().nextInt(numShards), topic);
+      @Nullable String orderingKey = message.getOrderingKey();
+      int shard =
+          Strings.isNullOrEmpty(orderingKey)

Review Comment:
   Addressed by 03b9159.



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