Fly-Style commented on code in PR #19269:
URL: https://github.com/apache/druid/pull/19269#discussion_r3081730247
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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()
Review Comment:
> The metric being emitted means we wanted to scale up/down to some value
that's outside the bounds of our spec.
That won't happen in the case of CBA, the algorithm has hard limitation of
picking potential values only within bounds.
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