[jira] Commented: (AMQ-1123) Deadlocks can occur with even with sync sends since they share a connection.

["Hiram Chirino (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/activemq/browse/AMQ-1123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_38595 ] 

Hiram Chirino commented on AMQ-1123:
------------------------------------

Workaround fix has been implemented in http://svn.apache.org/viewvc?view=rev&revision=511078 in the 4.1 branch.

Basically, if producer uses sync sends, he now can not block another producer on the shared connection.  To force all sends to be done sync, a new 'useSyncSend' option has been add to the ActiveMQConnectionFactory.

We should consider implementing a more robust soultion that will work even with async sends in 5.0.  This could be done by using producer flow control with acks similar to how we flow control consumers.  

> Deadlocks can occur with even with sync sends since they share a connection.
> ----------------------------------------------------------------------------
>
>                 Key: AMQ-1123
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1123
>             Project: ActiveMQ
>          Issue Type: Bug
>            Reporter: Hiram Chirino
>         Assigned To: Hiram Chirino
>
> If a producer sends to a queue and blocks, any other producer sharing the same connection even if he would be sending to an empty queue would also block.  This in effect can cause a deadlock if the right message processing flow is set up.

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