jtuglu1 commented on code in PR #19269:
URL: https://github.com/apache/druid/pull/19269#discussion_r3081619767
##########
indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/autoscaler/CostBasedAutoScaler.java:
##########
@@ -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:
Yes but the metric is a different meaning here. IMO, we should not be
emitting a metric if we explicitly don't want to scale. The metric being
emitted means we wanted to scale up/down to some value that's outside the
bounds of our spec. The value `-1` implies something else.
##########
indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/autoscaler/CostBasedAutoScaler.java:
##########
@@ -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:
> Ah, fair, but why I did it: we're emitting min/max with scalingSkipReason
dimension ... so it explicitly means 'no scaling was performed'.
Yes but the metric is a different meaning here. IMO, we should not be
emitting a metric if we explicitly don't want to scale. The metric being
emitted means we wanted to scale up/down to some value that's outside the
bounds of our spec. The value `-1` implies something else.
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