syhily commented on code in PR #21252:
URL: https://github.com/apache/flink/pull/21252#discussion_r1019826795


##########
flink-connectors/flink-connector-pulsar/src/test/java/org/apache/flink/connector/pulsar/testutils/function/ControlSource.java:
##########
@@ -183,37 +191,58 @@ public List<String> getExpectedRecords() {
     private static class StopSignal implements Closeable {
         private static final Logger LOG = 
LoggerFactory.getLogger(StopSignal.class);
 
-        private final String topic;
         private final int desiredCounts;
         // This is a thread-safe list.
         private final List<String> consumedRecords;
         private final AtomicLong deadline;
         private final ExecutorService executor;
+        private final Consumer<String> consumer;
+        private final AtomicReference<PulsarClientException> 
throwableException;
 
         public StopSignal(
                 PulsarRuntimeOperator operator, String topic, int 
messageCounts, Duration timeout) {
-            this.topic = topic;
             this.desiredCounts = messageCounts;
             this.consumedRecords = Collections.synchronizedList(new 
ArrayList<>(messageCounts));
             this.deadline = new AtomicLong(timeout.toMillis() + 
System.currentTimeMillis());
             this.executor = Executors.newSingleThreadExecutor();
+            ConsumerBuilder<String> consumerBuilder =
+                    operator.client()
+                            .newConsumer(Schema.STRING)
+                            .topic(topic)
+                            .subscriptionName(randomAlphanumeric(10))
+                            .subscriptionMode(Durable)
+                            .subscriptionType(Exclusive)
+                            
.subscriptionInitialPosition(SubscriptionInitialPosition.Earliest);
+            this.consumer = sneakyClient(consumerBuilder::subscribe);
+            this.throwableException = new AtomicReference<>();

Review Comment:
   I think it's ok to use `CompletableFuture` with better readability.



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