[GitHub] [kafka] zhaohaidao commented on a change in pull request #8665: KAFKA-9984 Should fail the subscription when pattern is empty

[GitBox <gi...@apache.org>]

zhaohaidao commented on a change in pull request #8665:
URL: https://github.com/apache/kafka/pull/8665#discussion_r425097747



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File path: clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java
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@@ -1015,8 +1015,8 @@ public void subscribe(Collection<String> topics) {
     @Override
     public void subscribe(Pattern pattern, ConsumerRebalanceListener listener) {
         maybeThrowInvalidGroupIdException();
-        if (pattern == null)
-            throw new IllegalArgumentException("Topic pattern to subscribe to cannot be null");
+        if (pattern == null || pattern.toString().equals(""))
+            throw new IllegalArgumentException("Topic pattern to subscribe to cannot be " + pattern == null ? "null" : "empty");

Review comment:
       Thanks. I have fixed this issue. Could you continue to review it.




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