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https://issues.apache.org/jira/browse/KAFKA-6184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jun Rao resolved KAFKA-6184.
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Resolution: Fixed
Fix Version/s: 1.2.0
The PR is merged to trunk.
> 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
> Priority: Major
> Labels: needs-kip
> Fix For: 1.2.0
>
>
> 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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