[jira] [Updated] (KAFKA-3197) Producer can send message out of order even when in flight request is set to 1.

["Jiangjie Qin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-3197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jiangjie Qin updated KAFKA-3197:
--------------------------------
    Status: Patch Available  (was: Open)

> Producer can send message out of order even when in flight request is set to 1.
> -------------------------------------------------------------------------------
>
>                 Key: KAFKA-3197
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3197
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients, producer 
>    Affects Versions: 0.9.0.0
>            Reporter: Jiangjie Qin
>            Assignee: Jiangjie Qin
>             Fix For: 0.9.0.1
>
>
> The issue we saw is following:
> 1. Producer send message 0 to topic-partition-0 on broker A. The in-flight request to broker A is 1.
> 2. The request is somehow lost
> 3. Producer refreshed its topic metadata and found leader of topic-partition-0 migrated from broker A to broker B.
> 4. Because there is no in-flight request to broker B. All the subsequent messages to topic-partition-0 in the record accumulator are sent to broker B.
> 5. Later on when the request in step (1) times out, message 0 will be retried and sent to broker B. At this point, all the later messages has already been sent, so we have re-order.



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