emitskevich-blp commented on code in PR #15889:
URL: https://github.com/apache/kafka/pull/15889#discussion_r1610393654
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clients/src/main/java/org/apache/kafka/common/metrics/stats/Rate.java:
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@@ -72,29 +67,12 @@ public long windowSize(MetricConfig config, long now) {
stat.purgeObsoleteSamples(config, now);
/*
- * Here we check the total amount of time elapsed since the oldest
non-obsolete window.
- * This give the total windowSize of the batch which is the time used
for Rate computation.
- * However, there is an issue if we do not have sufficient data for
e.g. if only 1 second has elapsed in a 30 second
- * window, the measured rate will be very high.
- * Hence we assume that the elapsed time is always N-1 complete
windows plus whatever fraction of the final window is complete.
- *
- * Note that we could simply count the amount of time elapsed in the
current window and add n-1 windows to get the total time,
- * but this approach does not account for sleeps. SampledStat only
creates samples whenever record is called,
- * if no record is called for a period of time that time is not
accounted for in windowSize and produces incorrect results.
+ * Purging process above guarantees to keep all events starting from
+ * earliest(monitoredWindow start, oldestSample start). Use the
largest as windowSize.
*/
- long totalElapsedTimeMs = now - stat.oldest(now).lastWindowMs;
- // Check how many full windows of data we have currently retained
- int numFullWindows = (int) (totalElapsedTimeMs /
config.timeWindowMs());
- int minFullWindows = config.samples() - 1;
-
- // If the available windows are less than the minimum required, add
the difference to the totalElapsedTime
- if (numFullWindows < minFullWindows)
- totalElapsedTimeMs += (minFullWindows - numFullWindows) *
config.timeWindowMs();
-
- // If window size is being calculated at the exact beginning of the
window with no prior samples, the window size
- // will result in a value of 0. Calculation of rate over a window is
size 0 is undefined, hence, we assume the
- // minimum window size to be at least 1ms.
- return Math.max(totalElapsedTimeMs, 1);
+ long monitoredWindow = config.timeWindowMs() * config.samples();
Review Comment:
@junrao looks like it is outdated state... I made several commits today and
this line is no more in HEAD. Is there any chance you commented on intermediate
state? Sorry for a little mess around commits here.
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