rkhachatryan commented on a change in pull request #10446: [FLINK-15076][task] 
Fix SourceStreamTask cancellation
URL: https://github.com/apache/flink/pull/10446#discussion_r355570314
 
 

 ##########
 File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/mailbox/MailboxProcessor.java
 ##########
 @@ -195,7 +195,12 @@ public void runMailboxLoop() throws Exception {
        public void reportThrowable(Throwable throwable) {
                sendControlMail(
                        () -> {
-                               throw 
WrappingRuntimeException.wrapIfNecessary(throwable);
+                               if (throwable instanceof Exception) {
+                                       throw (Exception) throwable;
+                               }
+                               else {
+                                       throw 
WrappingRuntimeException.wrapIfNecessary(throwable);
 
 Review comment:
   I meant logic like this:
   ```
                                if (throwable instanceof Exception) {
                                        throw (Exception) throwable;
                                } else if (throwable instanceof Error) {
                                        throw (Error) throwable;
                                } else {
                                        throw 
WrappingRuntimeException.wrapIfNecessary(throwable);
                                }
   ```
   My `javac` compiles it :)

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