kfaraz commented on code in PR #20706:
URL: https://github.com/apache/druid/pull/20706#discussion_r4366005535
##########
indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/SeekableStreamSupervisor.java:
##########
@@ -4066,17 +4072,15 @@ void maybeScaleDuringTaskRollover()
"Updating taskCount for supervisor[%s] from [%d] to [%d] during
rollover.",
supervisorId, currentTaskCount, rolloverTaskCount
);
- isScalingTasksOnRollover.set(true);
- try {
- new DynamicAllocationTasksNotice(
- () -> rolloverTaskCount,
- () -> {},
- emitter
- ).handle();
- }
- finally {
- isScalingTasksOnRollover.set(false);
- }
+ handleDynamicAllocationTasksNotice(
+ () -> rolloverTaskCount,
+ () -> {},
+ true
+ );
+ } else if (rolloverTaskCount != SupervisorTaskAutoScaler.CANNOT_COMPUTE)
{
Review Comment:
I don't think this is entirely correct.
For lagBased auto-scaler with cooldown > taskDuration, we do not attempt
scaling on rollover, but we do not reset the cooldown either. So, as soon as
the cooldown elapses, scaling will be attempted.
As for the implementation of rollover scaling for lagBased, we can do that
in a separate patch.
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