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Posted to jira@kafka.apache.org by "Jun Rao (JIRA)" <ji...@apache.org> on 2018/12/11 21:07:00 UTC
[jira] [Commented] (KAFKA-7713) producer io-wait-ratio > 1
[ https://issues.apache.org/jira/browse/KAFKA-7713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718002#comment-16718002 ]
Jun Rao commented on KAFKA-7713:
--------------------------------
io-wait-ratio is calculated as the ratio of accumulated selector waiting time over the length of the metric window. So as the metric window rolls, those accumulated waiting time falling into the rolled window will cause the metric to go above 1. Not sure what's the best way to address this. One way is to treat the Rate/Meter metric special. When we record the value, we split the value into the corresponding sample windows and bound the value by the window size.
> producer io-wait-ratio > 1
> --------------------------
>
> Key: KAFKA-7713
> URL: https://issues.apache.org/jira/browse/KAFKA-7713
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 2.1.0
> Reporter: dan norwood
> Priority: Major
>
> i am running a test on a streams application and gathering jmx measurements to determine what is causing some lag. using `kafka.tools.JmxTool` i was gathering the following attributes `'io-ratio', 'io-wait-ratio', 'select-rate', 'batch-size-avg', 'compression-rate-avg', 'record-size-avg', 'records-per-request-avg'` on my streams instances producers. i noticed that i was getting `io-wait-ratio > 1`, but according to docs it is "The fraction of time the I/O thread spent waiting."
>
> some example lines from jmxtool
> |StreamThread-8-producer:batch-size-avg|StreamThread-8-producer:compression-rate-avg|StreamThread-8-producer:io-ratio|*StreamThread-8-producer:io-wait-ratio*|StreamThread-8-producer:record-size-avg|StreamThread-8-producer:records-per-request-avg|StreamThread-8-producer:select-rate|
> |662.2613636|0.3425814926|1.01E-04|*1.178371974*|172.2045455|38.71666667|3.855527588|
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