jerrypeng commented on a change in pull request #7255:
URL: https://github.com/apache/pulsar/pull/7255#discussion_r444561903



##########
File path: 
pulsar-functions/worker/src/main/java/org/apache/pulsar/functions/worker/FunctionMetaDataManager.java
##########
@@ -174,89 +181,124 @@ public synchronized boolean containsFunction(String 
tenant, String namespace, St
     }
 
     /**
-     * Sends an update request to the FMT (Function Metadata Topic)
-     * @param functionMetaData The function metadata that needs to be updated
-     * @return a completable future of when the update has been applied
+     * Called by the worker when we are in the leader mode.  In this state, we 
update our in-memory
+     * data structures and then write to the metadata topic.
+     * @param functionMetaData The function metadata in question
+     * @param delete Is this a delete operation
+     * @throws IllegalStateException if we are not the leader
+     * @throws IllegalArgumentException if the request is out of date.
      */
-    public synchronized CompletableFuture<RequestResult> 
updateFunction(FunctionMetaData functionMetaData) {
-
-        FunctionMetaData existingFunctionMetadata = null;
-        if (containsFunction(functionMetaData.getFunctionDetails().getTenant(),
-                functionMetaData.getFunctionDetails().getNamespace(),
-                functionMetaData.getFunctionDetails().getName())) {
-            existingFunctionMetadata = 
getFunctionMetaData(functionMetaData.getFunctionDetails().getTenant(),
-                    functionMetaData.getFunctionDetails().getNamespace(),
-                    functionMetaData.getFunctionDetails().getName());
+    public synchronized void updateFunctionOnLeader(FunctionMetaData 
functionMetaData, boolean delete)
+            throws IllegalStateException, IllegalArgumentException {
+        if (exclusiveLeaderProducer == null) {
+            throw new IllegalStateException("Not the leader");
+        }
+        boolean needsScheduling;
+        if (delete) {
+            needsScheduling = proccessDeregister(functionMetaData);
+        } else {
+            needsScheduling = processUpdate(functionMetaData);
+        }
+        Request.ServiceRequest serviceRequest = 
Request.ServiceRequest.newBuilder()
+                .setServiceRequestType(delete ? 
Request.ServiceRequest.ServiceRequestType.DELETE : 
Request.ServiceRequest.ServiceRequestType.UPDATE)
+                .setFunctionMetaData(functionMetaData)
+                .setWorkerId(workerConfig.getWorkerId())
+                .setRequestId(UUID.randomUUID().toString())
+                .build();
+        try {
+            lastMessageSeen = 
exclusiveLeaderProducer.send(serviceRequest.toByteArray());
+        } catch (Exception e) {

Review comment:
       "errorNotifier.triggerError(e);" is still being called.  The worker 
might exit before exception gets bubbled up and a response send back




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