kirktrue commented on code in PR #14768:
URL: https://github.com/apache/kafka/pull/14768#discussion_r1395013498


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/LegacyKafkaConsumer.java:
##########
@@ -150,11 +150,9 @@ public class LegacyKafkaConsumer<K, V> implements 
ConsumerDelegate<K, V> {
             LogContext logContext = createLogContext(config, 
groupRebalanceConfig);
             this.log = logContext.logger(getClass());
             boolean enableAutoCommit = 
config.getBoolean(ENABLE_AUTO_COMMIT_CONFIG);
-            groupId.ifPresent(groupIdStr -> {
-                if (groupIdStr.isEmpty()) {
-                    log.warn("Support for using the empty group id by 
consumers is deprecated and will be removed in the next major release.");
-                }
-            });
+
+            if (this.groupId.isPresent() && this.groupId.get().isEmpty())

Review Comment:
   The use of `AbstractConfig.getString()` trims the returned value, so it will 
be sans whitespace already. A newly-added unit test shows this to be the case.



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