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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-7774) [Qpid JMS Client 0-x] [0-8..0-91] MessageConsumer#receiveNoWait() always returns null after a successful failover
Date Fri, 12 May 2017 12:42:04 GMT

    [ https://issues.apache.org/jira/browse/QPID-7774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16008054#comment-16008054
] 

ASF subversion and git services commented on QPID-7774:
-------------------------------------------------------

Commit 4748dbc9939e711c5acdf191edf61a3d7a28959d in qpid-broker-j's branch refs/heads/6.1.x
from [~alex.rufous]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-broker-j.git;h=4748dbc ]

QPID-7774: Improve locking when using failover latch


> [Qpid JMS Client 0-x] [0-8..0-91] MessageConsumer#receiveNoWait() always returns null
after a successful failover
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: QPID-7774
>                 URL: https://issues.apache.org/jira/browse/QPID-7774
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Client
>    Affects Versions: 0.22, 0.32, qpid-java-6.0.6, qpid-java-6.1.2
>            Reporter: Keith Wall
>            Assignee: Keith Wall
>             Fix For: qpid-java-client-0-x-6.3.0, qpid-java-6.1.3
>
>         Attachments: 0001-QPID-7774-Improve-locking-when-using-failover-latch.patch
>
>
> If the client fails over when AMQP 0-8..0-91 is in use and the application is using a
synchronous message receiver calling #receiveNoWait(), the application will always receive
null.  The defect is longstanding.  It goes back at least until 0.22.  Other synchronous receive
calls and asynchronous message listeners are unaffected.  The 0-10 path is unaffected too.
> The problem is {{org.apache.qpid.client.AMQConnection#isFailingOver}} and org.apache.qpid.client.AMQProtocolHandler#startFailoverThread.
  The former assumes that the failover latch will be nullified after a successful failover
but {{startFailoverThread}} does not organise for this.



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