kfaraz commented on code in PR #19562:
URL: https://github.com/apache/druid/pull/19562#discussion_r3468047057
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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.
Review Comment:
Please clarify here that this value was determined empirically and it was
seen that when task count is halved, idle ratio increases roughly by 1.25.
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