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https://issues.apache.org/jira/browse/KAFKA-19493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18004473#comment-18004473
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Apoorv Mittal commented on KAFKA-19493:
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[~isding_l] Please go ahead.
> Incorrect rate metric with larger window size
> ---------------------------------------------
>
> Key: KAFKA-19493
> URL: https://issues.apache.org/jira/browse/KAFKA-19493
> Project: Kafka
> Issue Type: Bug
> Components: clients, metrics
> Reporter: Apoorv Mittal
> Priority: Major
>
> The Kafka Rate metric gives incorrect rate when the window size is larger say
> hourly.
> I suspect the code for calculating rate is incorrect for metrics which are
> not emitting rate per second or millisecond. The code for time unit
> calculation seems wrong: [convert(windowSize(config, now),
> unit)|https://github.com/apache/kafka/blob/da4fbba2793528e283458e080a690ad141857b0b/clients/src/main/java/org/apache/kafka/common/metrics/stats/Rate.java#L67]
> i.e. the convert code divides the elapsed time in window to the time unit.
>
> The problem can be easily reporduced by looking at `rebalance-rate-per-hour`
> metric.
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