StefanRRichter commented on a change in pull request #8523: 
[FLINK-12481][runtime] Invoke timer callback in task thread (via mailbox)
URL: https://github.com/apache/flink/pull/8523#discussion_r288432083
 
 

 ##########
 File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java
 ##########
 @@ -1358,4 +1358,19 @@ public void actionsUnavailable() throws 
InterruptedException {
                        mailbox.putMail(actionUnavailableLetter);
                }
        }
+
+       private class TimerInvocationContext implements 
SystemProcessingTimeService.ScheduledCallbackExecutionContext {
+               @Override
+               public void invoke(ProcessingTimeCallback callback, long 
timestamp) throws InterruptedException {
+                       mailbox.putMail(() -> {
+                               synchronized (getCheckpointLock()) {
 
 Review comment:
   For this PR, I think it is still needed. After all checkpoint related 
messages go through the mailbox as well, I feel pretty sure that it is no 
longer needed.

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