vvcephei commented on code in PR #13490:
URL: https://github.com/apache/kafka/pull/13490#discussion_r1163354091


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/PrototypeAsyncConsumer.java:
##########
@@ -447,6 +482,19 @@ public void close() {
 
     @Override
     public void close(Duration timeout) {
+        if (timeout.toMillis() < 0)
+            throw new IllegalArgumentException("The timeout cannot be 
negative.");
+        try {
+            if (!closed) {
+                close(timeout, false);
+            }
+        } finally {
+            closed = true;

Review Comment:
   Yes you can! Although in general, you should not use synchronized methods, 
but instead use a synchronized block or a Lock or something.



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