codelipenghui commented on a change in pull request #9738:
URL: https://github.com/apache/pulsar/pull/9738#discussion_r585686991



##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/PulsarService.java
##########
@@ -957,8 +957,9 @@ public NamespaceService getNamespaceService() {
         return functionWorkerService;
     }
 
-    public WorkerService getWorkerService() {
-        return functionWorkerService.orElse(null);
+    public WorkerService getWorkerService() throws 
UnsupportedOperationException {
+        return functionWorkerService.orElseThrow(() -> new 
UnsupportedOperationException("Pulsar Function Worker is not " +
+                "enabled, probably functionsWorkerEnabled is set to false"));

Review comment:
       In my opinion, If throw exception while getWorkerService(), this might 
break some other places since it might just want to return a null value. As I 
said before if all the places are ok for handling the exception that 
getWorkerService() throws, I'm ok. I just worry about introducing some break 
changes.




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