J-HowHuang commented on code in PR #15517:
URL: https://github.com/apache/pinot/pull/15517#discussion_r2039838035
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pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/rebalance/TableRebalancer.java:
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@@ -431,6 +432,10 @@ private RebalanceResult doRebalance(TableConfig
tableConfig, RebalanceConfig reb
estimatedAverageSegmentSizeInBytes, allSegmentsFromIdealState,
segmentsToMonitor);
// Record the beginning of rebalance
+ // We emit this metric only when the rebalance does get to this code path,
i.e. excluding dry-run and downtime
+ if (_controllerMetrics != null) {
Review Comment:
We can't decrement by 1 in onSuccess/onNoop/onError because some code path
that never go to `updateOnStart` also call them (e.g. dry-run).
Using meter instead of gauge is because I saw this comment
https://github.com/apache/pinot/blob/870cf576357e30a17f37f3c414a101fd88bc8a68/pinot-common/src/main/java/org/apache/pinot/common/metrics/AbstractMetrics.java#L470-L473
And also using gauge might run into race condition and end up having no
rebalance running but still have a global count > 0, which could be quite
misleading (haven't proved this will be the case but my initial thought)
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