[jboss-jira] [JBoss JIRA] Commented: (JBMESSAGING-1878) Duplicated Messages received during failover process

[Yong Hao Gao (JIRA)]

    [ https://issues.jboss.org/browse/JBMESSAGING-1878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608139#comment-12608139 ] 

Yong Hao Gao commented on JBMESSAGING-1878:
-------------------------------------------

There are two possible error cases:

1. a message arrives at client side and added to the buffer right after the list has been cleared by failover (JBPAPP-6700).
2. a message just be removed from the buffer list but haven't been put into the ack list before failover. 

In either case the client will see the message twice.



> Duplicated Messages received during failover process
> ----------------------------------------------------
>
>                 Key: JBMESSAGING-1878
>                 URL: https://issues.jboss.org/browse/JBMESSAGING-1878
>             Project: JBoss Messaging
>          Issue Type: Bug
>          Components: Messaging Core
>    Affects Versions: 1.4.0.SP3.CP12, 1.4.8.GA
>            Reporter: Yong Hao Gao
>            Assignee: Yong Hao Gao
>            Priority: Critical
>             Fix For: 1.4.0.SP3.CP13, 1.4.8.SP1
>
>
> If a message is delivered to the client when failover happens, there is a chance that this message won't get cleaned up and put into client buffer, and the message will be recovered after failover and delivered to client so that the client may have received this message twice.

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