[jboss-jira] [JBoss JIRA] Commented: (JBPM-1071) Possible problem in concurrent signalling from multiple threads
Ronald van Kuijk (JIRA)
jira-events at lists.jboss.org
Wed Oct 17 19:25:03 EDT 2007
[ http://jira.jboss.com/jira/browse/JBPM-1071?page=comments#action_12383149 ]
Ronald van Kuijk commented on JBPM-1071:
----------------------------------------
what exceptions were thrown? and what action was not performed? There has been lots of discussion on simultaneous access to node, actions and database. Can you please check the JBPM-993 and JBPM-995 (and related) if that contains some more info?
> Possible problem in concurrent signalling from multiple threads
> ---------------------------------------------------------------
>
> Key: JBPM-1071
> URL: http://jira.jboss.com/jira/browse/JBPM-1071
> Project: JBoss jBPM
> Issue Type: Bug
> Components: Core Engine
> Affects Versions: jBPM jPDL 3.2.2
> Environment: Linux 2.6.21-1.3228.fc7 #1 SMP Tue Jun 12 14:56:37 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
> MySQL 5.0.22
> Reporter: Jiri Pechanec
> Assigned To: Tom Baeyens
> Priority: Critical
> Attachments: expl.tar.gz
>
>
> Attached is a simple test case that
> 1) Deploys process definition with two nodes
> 2) Starts the process instance that will go to the wait state on first node
> 3) Starts 20 threads that tries concurrently signal the same process instance
> 4) The second node writes a record to the database
> The test case needs to be executed multiple times to see the incorrect behaviour.
> This is an example of run output
> Isol 8
> Action 1
> Action 2
> Action 2
> Action 2
> Action 2
> Action 2 1
> Action 2 1
> Action 2 1
> Action 2 1
> Signalist 5
> Signalist 6
> Signalist 8
> Signalist 12
> Signalist 7
> Signalist 13
> Signalist 14
> Signalist 15
> Signalist 9
> Signalist 16
> Signalist 17
> Signalist 18
> Signalist 4
> Success 7
> Failure 13
> Explanation of the outcome
> 4 threads successfully executed the node action including database operation. All database opeartion were comitted (4 new records were created)
> 3 threads successfully executed the signal operation but no real action was performed
> 13 threads attempted to execute the signal operation but ended with an exception
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