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From "Jaewoong Choi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-4413) Persistent message loss when JMS durable subscriber reconnects regardless of message store impl.
Date Wed, 15 May 2013 20:53:16 GMT

    [ https://issues.apache.org/jira/browse/AMQ-4413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658802#comment-13658802
] 

Jaewoong Choi commented on AMQ-4413:
------------------------------------

Unfortunately it's not possible because the persistence adapter/store I tested with is a custom
one outside the AMQ code base. FYI, it's Apache BookKeeper-based and can't be shared outside
my company, yet.  The reason I tested with persistence option disabled is because of this
reason: I needed to verify it's persistence-store independent problem.
                
> Persistent message loss when JMS durable subscriber reconnects regardless of message
store impl.
> ------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-4413
>                 URL: https://issues.apache.org/jira/browse/AMQ-4413
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker, JMS client, Message Store
>    Affects Versions: 5.7.0, 5.8.0
>            Reporter: Jaewoong Choi
>            Priority: Critical
>         Attachments: AMQ4413-testcase.patch, AMQ4413Test.java, AMQ4413Test.java, Test.java
>
>
> Persistent message is lost intermittently when JMS durable topic subscriber reconnects
to the broker service.  From the log observation, it seems that the internal states of the
store cursor (i.e. AbstractStoreCursor) is not well guarded by race condition between message
sending/directly-dispatching-pending thread (from publisher) and subscription deactivating
thread (from subscriber's closing), especially when subscriber's closing (javax.jms.MessageConsumer#close)
and message publishing happen simultaneously.
> Observations and the test scenario are described at below in detail:
> http://activemq.2283324.n4.nabble.com/persistent-message-missing-to-a-durable-subscriber-when-it-reconnects-restarts-td4665130.html
> Attached please find Test.java that I used to verify this issue.  I found the issue initially
with activemq-core-5.7.0.jar then confirmed that it's reproducible with other upper versions
(i.e. apache-activemq-5.8-SNAPSHOT, apache-activemq-5.9-SNAPSHOT).
> This "message loss" issue is pretty critical as it can happen whenever durable subscriber
reconnects either purposely or unexpectedly, and it could be violating the one of primitive
features that messaging platform guarantees: "no message loss",  if happens, whereas it's
so easy to reproduce the trouble.

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