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https://issues.apache.org/jira/browse/KAFKA-6184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16245342#comment-16245342
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Vahid Hashemian commented on KAFKA-6184:
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[~huxi_2b], no worries. And thanks for offering it back, but you've already
spent more time on it than I did. Please carry on with it. Thanks :)
> report a metric of the lag between the consumer offset and the start offset
> of the log
> --------------------------------------------------------------------------------------
>
> Key: KAFKA-6184
> URL: https://issues.apache.org/jira/browse/KAFKA-6184
> Project: Kafka
> Issue Type: Improvement
> Affects Versions: 1.0.0
> Reporter: Jun Rao
> Assignee: Vahid Hashemian
>
> Currently, the consumer reports a metric of the lag between the high
> watermark of a log and the consumer offset. It will be useful to report a
> similar lag metric between the consumer offset and the start offset of the
> log. If this latter lag gets close to 0, it's an indication that the consumer
> may lose data soon.
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