bowenli86 commented on code in PR #240:
URL: 
https://github.com/apache/flink-connector-kafka/pull/240#discussion_r2943502352


##########
flink-connector-kafka/src/test/java/org/apache/flink/connector/kafka/dynamic/source/reader/DynamicKafkaSourceReaderPauseResumeTest.java:
##########


Review Comment:
   can you move these tests to DynamicKafkaSourceReaderTest.java to be in 
conventional test class?



##########
flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/dynamic/source/reader/DynamicKafkaSourceReader.java:
##########
@@ -417,6 +427,78 @@ public void notifyCheckpointComplete(long checkpointId) 
throws Exception {
         }
     }
 
+    @Override
+    public void pauseOrResumeSplits(
+            Collection<String> splitsToPause, Collection<String> 
splitsToResume) {
+        Map<String, List<String>> splitsToPauseByCluster = 
groupSplitIdsByCluster(splitsToPause);
+        Map<String, List<String>> splitsToResumeByCluster = 
groupSplitIdsByCluster(splitsToResume);
+
+        Set<String> kafkaClusterIds = new HashSet<>();
+        kafkaClusterIds.addAll(splitsToPauseByCluster.keySet());
+        kafkaClusterIds.addAll(splitsToResumeByCluster.keySet());
+
+        logger.debug(

Review Comment:
   make this info level, or add another simplier log line to indicate alignment 
actually kicked in?
   i don't think the operator has any log lines that actually log it



##########
flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/dynamic/source/reader/DynamicKafkaSourceReader.java:
##########
@@ -417,6 +427,78 @@ public void notifyCheckpointComplete(long checkpointId) 
throws Exception {
         }
     }
 
+    @Override
+    public void pauseOrResumeSplits(

Review Comment:
   tracking down the codepath, KafkaSourceReader. pauseOrResumeSplits() already 
filters the requested IDs down to its assigned splits before touching the 
fetcher.
   
   thus it can be simplified like this?
   
   ```
   @Override
   public void pauseOrResumeSplits(
           Collection<String> splitsToPause, Collection<String> splitsToResume) 
{
       // log a line here
       for (KafkaSourceReader<T> subReader : clusterReaderMap.values()) {
           subReader.pauseOrResumeSplits(splitsToPause, splitsToResume);
       }
   }
   ```
   



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