tanishq-chugh commented on code in PR #6723:
URL: https://github.com/apache/hive/pull/6723#discussion_r3880542453
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packaging/src/kubernetes/src/java/org/apache/hive/kubernetes/operator/autoscaling/ComponentAutoscaler.java:
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@@ -94,8 +94,13 @@ public EvaluationResult evaluate(List<PodMetrics> metrics,
AutoscalingSpec spec,
int target;
if (clamped > currentReplicas) {
- // Scale up: use stabilized max (highest recommendation in window —
don't under-scale)
- target = scaleUpWindow.stabilizedMax();
+ if (component.startsWith(ConfigUtils.COMPONENT_LLAP + "-")) {
+ // HS2 sessions activation gate scales up the LLAP pods to atleast 1
+ // in presence of sessions. Avoid stabilizedMin in this start-up case.
+ target = currentReplicas == 0 ? clamped :
scaleUpWindow.stabilizedMin();
Review Comment:
Llap scale-up has been intentionally changed to use StabilizedMin to prevent
over scaling in case of momentary reducer burst.
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