jtuglu1 commented on code in PR #19286:
URL: https://github.com/apache/druid/pull/19286#discussion_r3087906555
##########
indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/autoscaler/LagBasedAutoScaler.java:
##########
@@ -83,23 +82,24 @@ public LagBasedAutoScaler(
}
@Override
- public void start()
+ public int computeTaskCountForScaleAction()
{
- Callable<Integer> scaleAction = () -> {
- LOCK.lock();
- int desiredTaskCount = -1;
- try {
- desiredTaskCount = computeDesiredTaskCount(new
ArrayList<>(lagMetricsQueue));
- }
- catch (Exception ex) {
- log.warn(ex, "Exception while computing desired task count for
supervisor[%s]", spec.getId());
- }
- finally {
- LOCK.unlock();
- }
- return desiredTaskCount;
- };
+ LOCK.lock();
Review Comment:
I'm not planning to make any logical changes to the core lag auto-scaler
logic in this PR (it's big enough as-is). I think a follow-up can be done to
decide whether this lock is needed or not.
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