Fly-Style commented on code in PR #19269:
URL: https://github.com/apache/druid/pull/19269#discussion_r3062185886
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indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/autoscaler/CostBasedAutoScaler.java:
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@@ -174,11 +174,26 @@ public int computeTaskCountForScaleAction()
lastKnownMetrics = collectMetrics();
final int optimalTaskCount = computeOptimalTaskCount(lastKnownMetrics);
- final int currentTaskCount = supervisor.getIoConfig().getTaskCount();
+ int currentTaskCount = supervisor.getIoConfig().getTaskCount();
+
+ // Take the current task count but clamp it to the configured boundaries
if it is outside the boundaries.
+ // There might be a configuration instance with a handwritten taskCount
that is outside the boundaries.
+ final boolean isTaskCountOutOfBounds = currentTaskCount <
config.getTaskCountMin()
+ || currentTaskCount >
config.getTaskCountMax();
+ if (isTaskCountOutOfBounds) {
+ currentTaskCount = Math.min(config.getTaskCountMax(),
+ Math.max(config.getTaskCountMin(),
supervisor.getIoConfig().getTaskCount()));
+ }
// Perform scale-up actions; scale-down actions only if configured.
final int taskCount;
- if (isScaleActionAllowed() && optimalTaskCount > currentTaskCount) {
+
+ // If task count is out of bounds, scale to the configured boundary
+ // regardless of optimal task count, to get back to a safe state.
+ if (isScaleActionAllowed() && isTaskCountOutOfBounds) {
Review Comment:
That's a tricky thing, but my take here is -- eventually we will scale (and
by eventually I mean - within `minTriggerScaleActionFrequencyMillis` ms), and
it _might be_ harmful to scale immediately.
I don't have a strong opinion here, I am open to remove
`isScaleActionAllowed()` from the condition.
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