[jbpm-issues] [JBoss JIRA] Commented: (JBPM-1072) Concurrent JobExecutors can process the same job in parallel
[ http://jira.jboss.com/jira/browse/JBPM-1072?page=comments#action_12398841 ]
Alejandro Guizar commented on JBPM-1072:
----------------------------------------
Alexey Kostylev said:
Yes, you are right. If we have 1 job executor on 1 machine all is
working fine. The problem was if launching several job executors on 1
machine. But this is also is not a real problem for us.
The real problem is:
The result of query 'JobSession.getFirstAcquirableJob' is always
returned from the method acquireJobs() not depending on if optimistic
locking is failed or not.
Here is the log:
...
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG JobExecutorThread :
querying for acquirable job...
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG JobExecutorThread :
trying to obtain a lock for 'job[444795]'
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG JbpmContext :
closing jbpmContext org.jbpm.JbpmContext@274874
<mailto:org.jbpm.JbpmContext@274874>
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG Services : closing
service 'persistence':
org.jbpm.persistence.db.DbPersistenceService@116ce6e
<mailto:org.jbpm.persistence.db.DbPersistenceService@116ce6e>
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG
DbPersistenceService : committing hibernate transaction
org.hibernate.transaction.JDBCTransaction@105f759
<mailto:org.hibernate.transaction.JDBCTransaction@105f759>
12:09:42,687 [JbpmJobExector:192.168.125.34:1] INFO DbPersistenceService
: optimistic locking failed
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG
DbPersistenceService : rolling back hibernate transaction
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG
DbPersistenceService : closing hibernate session
12:09:42,687 [JbpmJobExector:192.168.125.34:1] INFO Services : problem
closing service 'persistence': optimistic locking failed
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG Services : closing
service 'tx': org.jbpm.tx.TxService@4aa085
<mailto:org.jbpm.tx.TxService@4aa085>
12:09:42,687 [JbpmJobExector:192.168.125.34:1] DEBUG JobExecutorThread :
obtained locks on following jobs: [job[444795]]
...
Concurrent JobExecutors can process the same job in parallel
------------------------------------------------------------
Key: JBPM-1072
URL: http://jira.jboss.com/jira/browse/JBPM-1072
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: Koen Aers
Attachments: expl.tar.gz
Attached is a simple test case that
1) Deploys process definition with two nodes
2) Starts 20 executor threads
2) Starts the process instance that will asynchronously execute action on the second
node
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
Success 0
Failure 0
Action 2
Action 2 1
Action 2
Action 2 1
Action 2
Action 2 1
Action 2
Action 2 1
Action 2
Action 2 1
Action 2
Action 2 1
Action 2
Action 2
Action 2 1
Action 2 1
Action 2
Action 2 1
Explanation of the outcome
9 job executors successfully executed the node action (same job) including database
operation. All database operations were comitted (9 new records were created)
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