1u0 commented on a change in pull request #8692: [FLINK-12804] Introduce 
mailbox-based ExecutorService
URL: https://github.com/apache/flink/pull/8692#discussion_r296599606
 
 

 ##########
 File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java
 ##########
 @@ -252,23 +261,31 @@ protected StreamTask(
         * Runs the stream-tasks main processing loop.
         */
        private void run() throws Exception {
-               final ActionContext actionContext = new ActionContext();
+               final Mailbox mailbox = taskMailboxExecutor.getMailbox();
 
 Review comment:
   Same as for `SourceStreamTask.runAlternativeMailboxLoop()`, you can add a 
precondition check that this method is called in the proper thread.

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