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https://issues.apache.org/jira/browse/KAFKA-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726576#comment-13726576
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Guozhang Wang commented on KAFKA-967:
-------------------------------------

Jun, before this patch each message will use a different key in 
ProducerPerformance, so are you suggesting that if messageKeyRangeOpt it not 
specified we should still use a distinct key for each message?

Currently if messageKeyRangeOpt is not set it uses a default key range.
                
> Use key range in ProducerPerformance
> ------------------------------------
>
>                 Key: KAFKA-967
>                 URL: https://issues.apache.org/jira/browse/KAFKA-967
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Guozhang Wang
>            Assignee: Guozhang Wang
>         Attachments: KAFKA-967.v1.patch, KAFKA-967.v2.patch
>
>
> Currently in ProducerPerformance, the key of the message is set to MessageID. 
> It would better to set it to a specific key within a key range (Integer type) 
> so that we can test the semantic partitioning case. This is related to 
> KAFKA-957.

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