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https://issues.apache.org/jira/browse/KAFKA-18597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17916669#comment-17916669
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Chia-Ping Tsai commented on KAFKA-18597:
----------------------------------------
trunk:
https://github.com/apache/kafka/commit/356f0d815cf99668e5acea427004bf01d8068439
> max-buffer-utilization-percent is always 0
> ------------------------------------------
>
> Key: KAFKA-18597
> URL: https://issues.apache.org/jira/browse/KAFKA-18597
> Project: Kafka
> Issue Type: Bug
> Reporter: Chia-Ping Tsai
> Assignee: Logan Zhu
> Priority: Minor
> Fix For: 4.1.0, 3.9.1, 4.0.1
>
>
> see
> [https://github.com/apache/kafka/blob/516d5240b98916feb3e51c8a143dede05a4edad1/core/src/main/scala/kafka/log/LogCleaner.scala#L127]
>
> private def maxOverCleanerThreads(f: CleanerThread => Double): Int =
> cleaners.foldLeft(0.0d)((max: Double, thread: CleanerThread) =>
> math.max(max, f(thread))).toInt
> /* a metric to track the maximum utilization of any thread's buffer in the
> last cleaning */
> metricsGroup.newGauge(MaxBufferUtilizationPercentMetricName,
> () => maxOverCleanerThreads(_.lastStats.bufferUtilization) * 100)
> we always round down the double value, so
> `maxOverCleanerThreads(_.lastStats.bufferUtilization)` returns 0 always
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