AmatyaAvadhanula commented on code in PR #13072:
URL: https://github.com/apache/druid/pull/13072#discussion_r969078983
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indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/SeekableStreamSupervisor.java:
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@@ -1454,20 +1454,23 @@ public void runInternal()
checkCurrentTaskState();
- synchronized (stateChangeLock) {
- // if supervisor is not suspended, ensure required tasks are running
- // if suspended, ensure tasks have been requested to gracefully stop
- if
(stateManager.getSupervisorState().getBasicState().equals(SupervisorStateManager.BasicState.STOPPING))
{
- // if we're already terminating, don't do anything here, the
terminate already handles shutdown
- log.info("[%s] supervisor is already stopping.", dataSource);
- } else if (!spec.isSuspended()) {
- log.info("[%s] supervisor is running.", dataSource);
-
-
stateManager.maybeSetState(SeekableStreamSupervisorStateManager.SeekableStreamState.CREATING_TASKS);
- createNewTasks();
- } else {
- log.info("[%s] supervisor is suspended.", dataSource);
- gracefulShutdownInternal();
+ // If supervisor is already stopping, don't contend for stateChangeLock
since the block can be skipped
+ if
(!stateManager.getSupervisorState().getBasicState().equals(SupervisorStateManager.BasicState.STOPPING))
{
Review Comment:
There is an additional check within the synchronized block to see if it has
been set to STOPPING.
The first check was added with the intent to prevent the need to enter that
block once the supervisor has begun stopping.
One such scenario is when a supervisor tries to terminate just before the
CREATING_TASKS phase which can be reproduced by terminating a supervisor, after
a period of its configured startDelay, right after creation.
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