xintongsong commented on code in PR #20553:
URL: https://github.com/apache/flink/pull/20553#discussion_r948725837


##########
flink-core/src/main/java/org/apache/flink/util/concurrent/DirectExecutorService.java:
##########
@@ -28,16 +28,17 @@
 import java.util.concurrent.Callable;
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.ExecutionException;
-import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
 /**
- * The direct executor service directly executes the runnables and the 
callables in the calling
- * thread.
+ * The direct scheduled executor service directly executes the runnables and 
the callables in the
+ * calling thread.
  */
-class DirectExecutorService implements ExecutorService {
+class DirectExecutorService implements ScheduledExecutorService {

Review Comment:
   I'm not sure about changing `DirectExecutorService`. The only reason I see 
for this change is that some shuffle test cases are using 
`Executors#newDirectExecutorService`. This also indicates that the code path 
for scheduling executions are never covered. Alternatively, we can make those 
tests to use a real scheduled executor service.



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