divijvaidya commented on code in PR #12045:
URL: https://github.com/apache/kafka/pull/12045#discussion_r897724922
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clients/src/main/java/org/apache/kafka/common/metrics/stats/Rate.java:
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@@ -68,24 +68,55 @@ public double measure(MetricConfig config, long now) {
}
public long windowSize(MetricConfig config, long now) {
- // purge old samples before we compute the window size
+ // Purge obsolete samples. Obsolete samples are the ones which are not
relevant to the current calculation
+ // because their creation time is outside (before) the duration of
time window used to calculate rate.
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.
+ * This gives the duration of computation time window which used to
calculate Rate.
Review Comment:
Thanks for catching this. I have fixed this in the latest revision.
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