Technoboy- commented on code in PR #23049:
URL: https://github.com/apache/pulsar/pull/23049#discussion_r1682991996


##########
pulsar-common/src/main/java/org/apache/pulsar/common/naming/SystemTopicNames.java:
##########
@@ -91,8 +104,23 @@ public static boolean isTransactionInternalName(TopicName 
topicName) {
                 || topic.endsWith(PENDING_ACK_STORE_SUFFIX);
     }
 
+    public static boolean isTransactionInternalLocalName(String 
localTopicName) {
+        return TRANSACTION_COORDINATOR_ASSIGN_LOCAL_NAME.equals(localTopicName)
+                || 
TRANSACTION_COORDINATOR_LOG_LOCAL_NAME.equals(localTopicName)
+                || PENDING_ACK_STORE_SUFFIX.equals(localTopicName);
+    }
+
     public static boolean isSystemTopic(TopicName topicName) {
-        TopicName nonPartitionedTopicName = 
TopicName.get(topicName.getPartitionedTopicName());
-        return isEventSystemTopic(nonPartitionedTopicName) || 
isTransactionInternalName(nonPartitionedTopicName);
+        int partition = topicName.getPartitionIndex();
+        String localTopicName = topicName.getLocalName();
+        if (partition >= 0) {
+            int suffixLen = PARTITIONED_TOPIC_SUFFIX.length() + 
String.valueOf(partition).length();
+            if (localTopicName.length() <= suffixLen) {
+                log.error("Found an error topic name: {}", topicName);
+                throw new IllegalArgumentException("Found an error topic name: 
" + topicName.toString());
+            }
+            localTopicName = localTopicName.substring(0, 
localTopicName.length() - suffixLen);
+        }
+        return isEventSystemTopicLocalName(localTopicName) || 
isTransactionInternalLocalName(localTopicName);

Review Comment:
   Why do we modify this method ? 



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