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_r287728381
##########
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:
@Aitozi I think this clearly can be dropped when everything goes through the
mailbox. Right now, I see still one case that must be considered, which is
`notifyCheckpointComplete` - unlike checkpoint trigger, this also is an RPC
call for non-source tasks and we need to run it in the mailbox as well before
we can drop the lock here and only rely on the mailbox and the locking that
happens in the alternative loop for curent source stream tasks. We should
remove the lock here in a cleanup PR once all other pieces are in place.
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