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https://issues.apache.org/jira/browse/KAFKA-2225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sönke Liebau resolved KAFKA-2225.
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Fix Version/s: 2.4.0
Resolution: Duplicate
I believe this functionality is covered by
[KIP-392|https://cwiki.apache.org/confluence/display/KAFKA/KIP-392%3A+Allow+consumers+to+fetch+from+closest+replica]
> Allow fetching from ISR
> -----------------------
>
> Key: KAFKA-2225
> URL: https://issues.apache.org/jira/browse/KAFKA-2225
> Project: Kafka
> Issue Type: Improvement
> Reporter: Theo Hultberg
> Assignee: Parth Brahmbhatt
> Priority: Major
> Fix For: 2.4.0
>
>
> Currently clients are not allowed to fetch from replicas, even if they are in
> sync with the master. If I'm not missing anything significant it shouldn't be
> any difference fetching from the leader or an ISR, besides maybe some extra
> latency.
> For our use case it would be very beneficial to be able to fetch from
> replicas instead of just the leader. We run Kafka clusters that replicate
> across EC2 availability zones, and each byte sent between zones costs money.
> This bandwith usage costs us about the same as it costs to run the instances.
> If we could fetch from a replica in the same zone as the client we could
> avoid some of this cost.
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