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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-6221) ActiveMQTextMessage should synchronize on state changes
Date Mon, 11 Apr 2016 12:19:25 GMT

    [ https://issues.apache.org/jira/browse/AMQ-6221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234967#comment-15234967
] 

ASF subversion and git services commented on AMQ-6221:
------------------------------------------------------

Commit 837da7e58222e49c76da062c6aa8e3d32432a1a7 in activemq's branch refs/heads/master from
[~cshannon]
[ https://git-wip-us.apache.org/repos/asf?p=activemq.git;h=837da7e ]

Revert "https://issues.apache.org/jira/browse/AMQ-6221"

Reverting commit to keep sync out of the client messages

This reverts commit e0c549996479c2a1ccf70029ad4462cb987650f6.


> ActiveMQTextMessage should synchronize on state changes
> -------------------------------------------------------
>
>                 Key: AMQ-6221
>                 URL: https://issues.apache.org/jira/browse/AMQ-6221
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker, JMS client
>    Affects Versions: 5.13.2
>            Reporter: Christopher L. Shannon
>            Assignee: Christopher L. Shannon
>             Fix For: 5.14.0, 5.13.3
>
>
> In AMQ-5857, the text field was changed to be cleared after calling beforeMarshall on
a text message.  This is causing general concurrency issues when multiple threads access the
message.  The most notable issue is when using the VM transport and concurrent store and dispatch
is turned on for KahaDB as seen in AMQ-6218.  In that ticket I re-arranged the order a bit
on copy to help with the race condition but it is still theoretically possible.  We need to
add explicit synchronization when reading/writing the marshalled/unmarshalled state fields
to prevent the race condition in ActiveMQTextMessage.
> Right now ActiveMQTextMessage is the main issue since it has been changed to clear out
text on marshalling by default.   Map and Object messages don't currently clear out their
data by default like text message does so they aren't currently affected but would need synchronization
added in a future commit if the same strategy was followed.



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