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https://issues.apache.org/jira/browse/KAFKA-15080?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-15080.
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Fix Version/s: 3.5.1
3.6.0
Resolution: Fixed
> Fetcher's lag never set when partition is idle
> ----------------------------------------------
>
> Key: KAFKA-15080
> URL: https://issues.apache.org/jira/browse/KAFKA-15080
> Project: Kafka
> Issue Type: Bug
> Reporter: David Jacot
> Assignee: David Jacot
> Priority: Major
> Fix For: 3.5.1, 3.6.0
>
>
> The PartitionFetchState's lag field is set to None when the state is created
> and it is updated when bytes are received for a partition. For idle
> partitions (newly created or not), the lag is never updated because
> `validBytes > 0` is never true. As a side effect, the partition is considered
> out-of-sync and could be incorrectly throttled.
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