kfaraz commented on code in PR #19562:
URL: https://github.com/apache/druid/pull/19562#discussion_r3467944309
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indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/autoscaler/WeightedCostFunction.java:
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@@ -42,6 +42,12 @@ public class WeightedCostFunction
*/
static final double LAG_AMPLIFICATION_MULTIPLIER = 0.4;
+ /**
+ * Exponent (< 1) for sublinear busy redistribution in the idle
projection: busy grows as
+ * {@code (currentTaskCount / proposedTaskCount)^EXPONENT}, not linearly.
Calibrated as log2(1.25) ~= 0.32.
+ */
+ static final double IDLE_SUBLINEARITY_EXPONENT = 0.32;
Review Comment:
Ah, thanks!
I guess you mean,
> In reality, busy grows sublinearly (an observed 2× consolidation raised
busy ~1.25×, not 2×).
Do you mean that when task count is halved, idle ratio increases by 1.25x?
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