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https://issues.apache.org/jira/browse/KAFKA-13888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536210#comment-17536210
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Niket Goel commented on KAFKA-13888:
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Hi [~Jack-Lee],
Thanks for the suggestion. I think your proposal is to add a field - `Lag` to
the `DescribeQuorumResponse` and modeling lag as the difference in the offsets
of the leaders and the respective voters.
Assuming I understood your proposal correctly, this is a little different from
what we want. The lag in terms of offset can already by computed by a client
which calls the `DescribeQuorum` API, as the `CurrentVoters` will return the
`LogEndOffset` of each voter and the leader's own offset information is also
known. However, as described the in the KIP[1], the offset difference is not
necessarily an accurate picture the lag for a voter in the quorum. The KIP
proposes adding some time based fields to the response to allow a more accurate
computation of the lag.
Feel free to add your comments to the discussion thread for the KIP if you have
any.
Thanks
Niket
[1]
https://cwiki.apache.org/confluence/display/KAFKA/KIP-836%3A+Addition+of+Information+in+DescribeQuorumResponse+about+Voter+Lag
> KIP-836: Addition of Information in DescribeQuorumResponse about Voter Lag
> --------------------------------------------------------------------------
>
> Key: KAFKA-13888
> URL: https://issues.apache.org/jira/browse/KAFKA-13888
> Project: Kafka
> Issue Type: Improvement
> Components: kraft
> Reporter: Niket Goel
> Priority: Major
>
> Tracking issue for the implementation of KIP:836
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