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https://issues.apache.org/jira/browse/KAFKA-1546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14358063#comment-14358063
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Jay Kreps commented on KAFKA-1546:
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Well iiuc the wonderfulness of this feature is that it actually doesn't add any 
new configs, it removes an old one that was impossible to set correctly and 
slightly modifies the meaning of an existing one to do what it sounds like it 
does. So I do think that for 99.5% of the world this will be like, wow, Kafka 
replication is much more robust.

I do think it is definitely a bug fix not a feature. But hey, I love me some 
KIPs, so I can't object to a nice write-up if you think it would be good to 
have.

> Automate replica lag tuning
> ---------------------------
>
>                 Key: KAFKA-1546
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1546
>             Project: Kafka
>          Issue Type: Improvement
>          Components: replication
>    Affects Versions: 0.8.0, 0.8.1, 0.8.1.1
>            Reporter: Neha Narkhede
>            Assignee: Aditya Auradkar
>              Labels: newbie++
>             Fix For: 0.8.3
>
>         Attachments: KAFKA-1546.patch, KAFKA-1546_2015-03-11_18:48:09.patch
>
>
> Currently, there is no good way to tune the replica lag configs to 
> automatically account for high and low volume topics on the same cluster. 
> For the low-volume topic it will take a very long time to detect a lagging
> replica, and for the high-volume topic it will have false-positives.
> One approach to making this easier would be to have the configuration
> be something like replica.lag.max.ms and translate this into a number
> of messages dynamically based on the throughput of the partition.



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