tillrohrmann commented on a change in pull request #13263:
URL: https://github.com/apache/flink/pull/13263#discussion_r478544665



##########
File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/active/ActiveResourceManagerTest.java
##########
@@ -307,6 +308,33 @@ public void testWorkerTerminatedNoLongerRequired() throws 
Exception {
                }};
        }
 
+       @Test
+       public void testCloseTaskManagerConnectionOnWorkerTerminated() throws 
Exception {
+               new Context() {{
+                       final ResourceID tmResourceId = ResourceID.generate();
+                       final CompletableFuture<TaskExecutorProcessSpec> 
requestWorkerFromDriverFuture = new CompletableFuture<>();
+                       final CompletableFuture<Void> 
disconnectResourceManagerFuture = new CompletableFuture<>();
+
+                       final TestingTaskExecutorGateway taskExecutorGateway = 
new TestingTaskExecutorGatewayBuilder()
+                               .setDisconnectResourceManagerConsumer((ignore) 
-> disconnectResourceManagerFuture.complete(null))
+                               .createTestingTaskExecutorGateway();
+
+                       
driverBuilder.setRequestResourceFunction(taskExecutorProcessSpec -> {
+                               
requestWorkerFromDriverFuture.complete(taskExecutorProcessSpec);
+                               return 
CompletableFuture.completedFuture(tmResourceId);
+                       });
+
+                       runTest(() -> {
+                               // request a new worker, terminate it after 
registered
+                               runInMainThread(() -> 
getResourceManager().startNewWorker(WORKER_RESOURCE_SPEC))
+                                       .thenCompose((ignrore) -> 
registerTaskExecutor(tmResourceId, taskExecutorGateway))

Review comment:
       ```suggestion
                                        .thenCompose((ignore) -> 
registerTaskExecutor(tmResourceId, taskExecutorGateway))
   ```

##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/active/ActiveResourceManager.java
##########
@@ -197,11 +197,12 @@ public void 
onPreviousAttemptWorkersRecovered(Collection<WorkerType> recoveredWo
        }
 
        @Override
-       public void onWorkerTerminated(ResourceID resourceId) {
-               log.info("Worker {} is terminated.", 
resourceId.getStringWithMetadata());
+       public void onWorkerTerminated(ResourceID resourceId, Exception cause) {

Review comment:
       If we don't really use `Exception cause` here, then I would suggest to 
simply change it into a `String diagnostics` parameter. We can later still 
change it if we need an `Exception` to be reported.

##########
File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/active/ActiveResourceManagerTest.java
##########
@@ -307,6 +308,33 @@ public void testWorkerTerminatedNoLongerRequired() throws 
Exception {
                }};
        }
 
+       @Test
+       public void testCloseTaskManagerConnectionOnWorkerTerminated() throws 
Exception {
+               new Context() {{
+                       final ResourceID tmResourceId = ResourceID.generate();
+                       final CompletableFuture<TaskExecutorProcessSpec> 
requestWorkerFromDriverFuture = new CompletableFuture<>();
+                       final CompletableFuture<Void> 
disconnectResourceManagerFuture = new CompletableFuture<>();
+
+                       final TestingTaskExecutorGateway taskExecutorGateway = 
new TestingTaskExecutorGatewayBuilder()
+                               .setDisconnectResourceManagerConsumer((ignore) 
-> disconnectResourceManagerFuture.complete(null))
+                               .createTestingTaskExecutorGateway();
+
+                       
driverBuilder.setRequestResourceFunction(taskExecutorProcessSpec -> {
+                               
requestWorkerFromDriverFuture.complete(taskExecutorProcessSpec);
+                               return 
CompletableFuture.completedFuture(tmResourceId);
+                       });
+
+                       runTest(() -> {
+                               // request a new worker, terminate it after 
registered
+                               runInMainThread(() -> 
getResourceManager().startNewWorker(WORKER_RESOURCE_SPEC))
+                                       .thenCompose((ignrore) -> 
registerTaskExecutor(tmResourceId, taskExecutorGateway))
+                                       .thenRun(() -> runInMainThread(() -> 
getResourceManager().onWorkerTerminated(tmResourceId, new Exception())));
+                               // verify task manager connection is closed
+                               
disconnectResourceManagerFuture.get(TIMEOUT_SEC, TimeUnit.SECONDS);
+                       });

Review comment:
       I really like this test setup. It is very elegant :-)




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