Fly-Style commented on code in PR #18958:
URL: https://github.com/apache/druid/pull/18958#discussion_r2734996454
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indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/autoscaler/CostBasedAutoScaler.java:
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@@ -157,11 +164,17 @@ public int computeTaskCountForScaleAction()
final int optimalTaskCount = computeOptimalTaskCount(lastKnownMetrics);
final int currentTaskCount = lastKnownMetrics.getCurrentTaskCount();
- // Perform only scale-up actions
+ // Perform scale-up actions; scale-down actions only if configured.
int taskCount = -1;
if (optimalTaskCount > currentTaskCount) {
taskCount = optimalTaskCount;
- log.info("New task count [%d] on supervisor [%s]", taskCount,
supervisorId);
+ scaleDownCounter = 0; // Nullify the scaleDown counter after a
successful scaleup too.
+ log.info("New task count [%d] on supervisor [%s], scaling up",
taskCount, supervisorId);
+ } else if (!config.isScaleDownOnTaskRolloverOnly() && optimalTaskCount <
currentTaskCount &&
+ (config.getScaleDownBarrier() == 0 || ++scaleDownCounter ==
config.getScaleDownBarrier())) {
Review Comment:
Yep, good catch!
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