zentol commented on code in PR #21304:
URL: https://github.com/apache/flink/pull/21304#discussion_r1021186465


##########
flink-rpc/flink-rpc-akka/src/test/java/org/apache/flink/runtime/rpc/akka/ContextClassLoadingSettingTest.java:
##########
@@ -150,21 +154,28 @@ void 
testAkkaRpcService_ScheduleRunnableSetsFlinkContextClassLoader()
     void 
testAkkaRpcService_ScheduleRunnableWithFixedRateSetsFlinkContextClassLoader() {
         final int numberOfScheduledRuns = 2;
         final List<ClassLoader> contextClassLoaders = new 
ArrayList<>(numberOfScheduledRuns);
-        akkaRpcService
-                .getScheduledExecutor()
-                .scheduleAtFixedRate(
-                        () -> {
-                            if (contextClassLoaders.size() < 
numberOfScheduledRuns) {
-                                contextClassLoaders.add(
-                                        
Thread.currentThread().getContextClassLoader());
-                            } else {
-                                throw new RuntimeException("cancel task");
-                            }
-                        },
-                        0,
-                        1,
-                        TimeUnit.MILLISECONDS);
-
+        ScheduledFuture<?> future =
+                akkaRpcService
+                        .getScheduledExecutor()
+                        .scheduleAtFixedRate(
+                                () -> {
+                                    if (contextClassLoaders.size() < 
numberOfScheduledRuns) {
+                                        contextClassLoaders.add(
+                                                
Thread.currentThread().getContextClassLoader());
+                                    } else {
+                                        throw new RuntimeException("cancel 
task");
+                                    }
+                                },
+                                0,
+                                1,
+                                TimeUnit.MILLISECONDS);
+        try {
+            future.get();

Review Comment:
   use assertThatThrownBy



##########
flink-rpc/flink-rpc-akka/src/test/java/org/apache/flink/runtime/rpc/akka/ContextClassLoadingSettingTest.java:
##########
@@ -150,21 +154,28 @@ void 
testAkkaRpcService_ScheduleRunnableSetsFlinkContextClassLoader()
     void 
testAkkaRpcService_ScheduleRunnableWithFixedRateSetsFlinkContextClassLoader() {
         final int numberOfScheduledRuns = 2;
         final List<ClassLoader> contextClassLoaders = new 
ArrayList<>(numberOfScheduledRuns);
-        akkaRpcService
-                .getScheduledExecutor()
-                .scheduleAtFixedRate(
-                        () -> {
-                            if (contextClassLoaders.size() < 
numberOfScheduledRuns) {
-                                contextClassLoaders.add(
-                                        
Thread.currentThread().getContextClassLoader());
-                            } else {
-                                throw new RuntimeException("cancel task");
-                            }
-                        },
-                        0,
-                        1,
-                        TimeUnit.MILLISECONDS);
-
+        ScheduledFuture<?> future =
+                akkaRpcService
+                        .getScheduledExecutor()
+                        .scheduleAtFixedRate(
+                                () -> {
+                                    if (contextClassLoaders.size() < 
numberOfScheduledRuns) {
+                                        contextClassLoaders.add(
+                                                
Thread.currentThread().getContextClassLoader());
+                                    } else {
+                                        throw new RuntimeException("cancel 
task");
+                                    }
+                                },
+                                0,
+                                1,
+                                TimeUnit.MILLISECONDS);
+        try {
+            future.get();
+            fail("The future should fail.");

Review Comment:
   It could be more straight-forward to complete a future within 
`scheduleAtFixedRate` (before the throw the exception) that we wait for outside 
the executor.



##########
flink-rpc/flink-rpc-akka/src/test/java/org/apache/flink/runtime/rpc/akka/ContextClassLoadingSettingTest.java:
##########
@@ -173,21 +184,30 @@ void 
testAkkaRpcService_ScheduleRunnableWithFixedRateSetsFlinkContextClassLoader
     @Test
     void 
testAkkaRpcService_ScheduleRunnableWithFixedDelaySetsFlinkContextClassLoader() {
         final int numberOfScheduledRuns = 2;
+
         final List<ClassLoader> contextClassLoaders = new 
ArrayList<>(numberOfScheduledRuns);
-        akkaRpcService
-                .getScheduledExecutor()
-                .scheduleWithFixedDelay(
-                        () -> {
-                            if (contextClassLoaders.size() < 
numberOfScheduledRuns) {
-                                contextClassLoaders.add(
-                                        
Thread.currentThread().getContextClassLoader());
-                            } else {
-                                throw new RuntimeException("cancel task");
-                            }
-                        },
-                        0,
-                        1,
-                        TimeUnit.MILLISECONDS);
+        ScheduledFuture<?> future =
+                akkaRpcService
+                        .getScheduledExecutor()
+                        .scheduleWithFixedDelay(
+                                () -> {
+                                    if (contextClassLoaders.size() < 
numberOfScheduledRuns) {
+                                        contextClassLoaders.add(
+                                                
Thread.currentThread().getContextClassLoader());
+                                    } else {
+                                        throw new RuntimeException("cancel 
task");
+                                    }
+                                },
+                                0,
+                                1,
+                                TimeUnit.MILLISECONDS);
+        try {
+            future.get();

Review Comment:
   
   
   use assertThatThrownBy
   



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