xyuanlu commented on code in PR #2553:
URL: https://github.com/apache/helix/pull/2553#discussion_r1260129831
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helix-core/src/main/java/org/apache/helix/controller/stages/TopStateHandoffReportStage.java:
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@@ -469,16 +475,17 @@ private void
reportTopStateComesBack(ResourceControllerDataProvider cache, Map<S
}
}
+ long duration = handOffEndTime - handOffStartTime;
+ long helixLatency = duration - fromTopStateUserLatency -
toTopStateUserLatency;
+ // It is possible that during controller leader switch, we lost previous
master information
+ // and use current time to approximate missing top state start time. If we
see the actual
+ // user latency is larger than the duration we estimated, we use user
latency to start with
+ duration = Math.max(duration, helixLatency);
+ boolean isGraceful = record.isGracefulHandoff();
+ logMissingTopStateInfo(duration, helixLatency, isGraceful,
partition.getPartitionName());
+ // TODO: Following threshold check can be removed and stats can be
reported even if hand-off took more than
+ // threshold.
if (handOffStartTime > 0 && handOffEndTime - handOffStartTime <=
threshold) {
Review Comment:
Question: We log for every single partition. Participants can have thousands
of partitions on one host. When host joining and leaving cluster, will it flood
our log?
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