kfaraz commented on code in PR #19622:
URL: https://github.com/apache/druid/pull/19622#discussion_r3474052394
##########
indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/autoscaler/WeightedCostFunction.java:
##########
@@ -156,6 +157,19 @@ public CostResult computeCost(
return new CostResult(cost, lagCost, weightedIdleCost);
}
+ /**
+ * Derives the current idle ratio from measured utilization ({@code
avgProcessingRate / maxObservedRate}).
+ */
+ static double estimateIdleFromUtilization(CostMetrics metrics)
+ {
+ final Double maxObservedRate = metrics.getMaxObservedRate();
+ if (maxObservedRate == null || maxObservedRate <= 0) {
+ return IDEAL_IDLE_RATIO;
Review Comment:
Thanks! We can tune it further based on how it performs in real clusters.
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