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https://issues.apache.org/jira/browse/KAFKA-4429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796361#comment-15796361
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ASF GitHub Bot commented on KAFKA-4429:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/2155
> records-lag should be zero if FetchResponse is empty
> ----------------------------------------------------
>
> Key: KAFKA-4429
> URL: https://issues.apache.org/jira/browse/KAFKA-4429
> Project: Kafka
> Issue Type: Improvement
> Reporter: Dong Lin
> Assignee: Dong Lin
> Fix For: 0.10.2.0
>
>
> In Fetcher we record records-lag in terms of number of records for any
> partition. Currently this metric value is updated only if number of parsed
> records is not empty. This means that if consumer has already fully caught up
> and there is no new data into the topic, this metric's value will be negative
> infinity and users can not rely on this metric to know if their consumer has
> caught up.
> We can fix this problem by assuming the lag is zero is FetchResponse is empty.
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