gianm commented on code in PR #12901:
URL: https://github.com/apache/druid/pull/12901#discussion_r945351663
##########
indexing-service/src/main/java/org/apache/druid/indexing/overlord/TaskQueue.java:
##########
@@ -568,62 +591,65 @@ private void notifyStatus(final Task task, final
TaskStatus taskStatus, String r
taskStatus.getId()
);
- // Inform taskRunner that this task can be shut down
- TaskLocation taskLocation = TaskLocation.unknown();
- try {
- taskLocation = taskRunner.getTaskLocation(task.getId());
- taskRunner.shutdown(task.getId(), reasonFormat, args);
+ if (!taskStatus.isComplete()) {
+ // Nothing to do for incomplete statuses.
+ return;
}
- catch (Exception e) {
- log.warn(e, "TaskRunner failed to cleanup task after completion: %s",
task.getId());
- }
-
- int removed = 0;
-
- ///////// critical section
+ // Critical section: add this task to recentlyCompletedTasks, so it isn't
managed while being cleaned up.
giant.lock();
try {
- // Remove from running tasks
- for (int i = tasks.size() - 1; i >= 0; i--) {
- if (tasks.get(i).getId().equals(task.getId())) {
- removed++;
- removeTaskInternal(tasks.get(i));
- break;
- }
- }
-
- // Remove from futures list
- taskFutures.remove(task.getId());
+ recentlyCompletedTasks.add(task.getId());
}
finally {
giant.unlock();
}
- ///////// end critical
+ final TaskLocation taskLocation = taskRunner.getTaskLocation(task.getId());
- if (removed == 0) {
- log.warn("Unknown task completed: %s", task.getId());
+ // Save status to metadata store first, so if we crash while doing the
rest of the shutdown, our successor
Review Comment:
The order switch solves the original race but creates a new one, which you
have listed as case (2). It would create a situation where two threads are
trying to clean up the same task at the same time. This may be fine, but I
don't think it's prudent to rely on it being fine. Cleaner to ensure that only
one thread tries to clean up the task.
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