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https://issues.apache.org/jira/browse/KAFKA-3036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15160257#comment-15160257
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Ismael Juma commented on KAFKA-3036:
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[~becket_qin], this has been done right?
> Add up-conversion and down-conversion of ProducerRequest and FetchRequest to
> broker.
> ------------------------------------------------------------------------------------
>
> Key: KAFKA-3036
> URL: https://issues.apache.org/jira/browse/KAFKA-3036
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Jiangjie Qin
> Assignee: Jiangjie Qin
> Fix For: 0.10.0.0
>
>
> This ticket will implement the necessary up-conversion and down-conversion
> for protocol migration in KIP-31 and KIP-32.
> https://cwiki.apache.org/confluence/display/KAFKA/KIP-32+-+Add+CreateTime+and+LogAppendTime+to+Kafka+message
> As a short summary:
> 1. When message.format.version=0, down-convert MessageAndOffset v1 to
> MessageAndOffset v0 when receives ProduceRequest v2
> 2. When message.format.version=1
> a. up-convert MessageAndOffset v0 to MessageAndOffset v1 when receives
> ProduceRequest v1
> b. down-convert MessageAndOffst v1 to MessageAndOffset v0 when receives
> FetchRequest v1
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