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https://issues.apache.org/jira/browse/KAFKA-17926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17895313#comment-17895313
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Federico Valeri commented on KAFKA-17926:
-----------------------------------------

> If users configure `max.in.flight.requests.per.connection>5`, the idempotent 
> will be disabled

Yes, but that's not the default configuration, as used changed 
max.in.flight.requests.per.connection. Are you suggesting that idempotent 
should be the only option available?

> Improve the documentation explaining why 
> max.in.flight.requests.per.connection should not exceed 5.
> ---------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-17926
>                 URL: https://issues.apache.org/jira/browse/KAFKA-17926
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Chia-Ping Tsai
>            Assignee: PoAn Yang
>            Priority: Minor
>
> We should highlight that the server [0] retains record metadata for the 5 
> most recent batches, so sending too many requests to a node simultaneously 
> can break idempotence.
> [0] 
> https://github.com/apache/kafka/blob/af53758746485daa06c4d4366036c04f7f9f0e63/storage/src/main/java/org/apache/kafka/storage/internals/log/ProducerStateEntry.java#L32



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