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https://issues.apache.org/jira/browse/KAFKA-6184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244270#comment-16244270
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Jun Rao commented on KAFKA-6184:
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[~huxi_2b], thanks for your the patch. Since this is a public facing change, we
will need a KIP. Could you submit one? 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: huxihx
>
> 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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