[jira] [Updated] (BOOKKEEPER-37) Ordering of published messages is not preserved when doing asynchronous publication

["Ivan Kelly (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BOOKKEEPER-37?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ivan Kelly updated BOOKKEEPER-37:
---------------------------------

    Priority: Blocker  (was: Major)
    
> Ordering of published messages is not preserved when doing asynchronous publication
> -----------------------------------------------------------------------------------
>
>                 Key: BOOKKEEPER-37
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-37
>             Project: Bookkeeper
>          Issue Type: Bug
>          Components: hedwig-client
>    Affects Versions: 4.0.0
>            Reporter: Matthieu Morel
>            Assignee: Matthieu Morel
>            Priority: Blocker
>             Fix For: 4.3.0
>
>         Attachments: BOOKKEEPER-37.patch, ClientMessageOrderingTest.java
>
>
> Symptoms: 
> - if a publisher sends messages asynchronously through the asyncPublish method, the ordering is not preserved in Hedwig
> Example: 
> - a publisher sends M1, M2, M3 by invoking the asyncPublish method
> The Hedwig broker may see these messages in the following order: M2, M1, M3
> A subscriber will also see messages as M2, M1, M3
> How to reproduce:
> - see attached test case: synchronous publishing preserves ordering, but asynchronous publishing does not.
> The cause of the problem:
> - my understanding is that this is due to asynchronous creation of multiple netty channels on the publisher side. There is no ordering since messages are not sent through the same channel. 
> Suggested solution:
> Some buffering on the publisher side would allow to reuse the same channel and maintain ordering.

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