[Hibernate-JIRA] Created: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
9:52 a.m.
optimizers for enhanced id generators should be synchronized against multi-threaded
access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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9:54 a.m.
New subject: [Hibernate-JIRA] Updated: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Steve Ebersole updated HHH-2928:
--------------------------------
Fix Version/s: 3.3
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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11:21 a.m.
New subject: [Hibernate-JIRA] Resolved: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Steve Ebersole resolved HHH-2928.
---------------------------------
Resolution: Fixed
trunk / 3.2
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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11:12 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Maciej Baranowski commented on HHH-2928:
----------------------------------------
The same problem exists for NoopOptimizer which is used by default by
SequenceStyleGenerator, when target database is Oracle.
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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11:38 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Steve Ebersole commented on HHH-2928:
-------------------------------------
untrue, noop has no internal state for which to serialize access.
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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8:44 p.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Maciej Baranowski commented on HHH-2928:
----------------------------------------
The problem is here the lastSourceValue field in NoopOptimizer.
Because invoking callback.getNextValue() and assigning it to the field is not atomic
operation, with very unlucky timing we can have race-condition.
It is hard to reproduce the problem, unless you add some Thread.sleep() before last line
in generate method.
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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8:48 p.m.
New subject: [Hibernate-JIRA] Updated: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Maciej Baranowski updated HHH-2928:
-----------------------------------
Attachment: NoopOptimizerTest.java
Here is a quite simple test case which should help to reproduce the problem. As I
mentioned earlier it may be necessary to add some Thread.sleep() before line:
return make( lastSourceValue );
in NoopOptimizer.generate() method.
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Attachments: NoopOptimizerTest.java
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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4:45 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Maciej Baranowski commented on HHH-2928:
----------------------------------------
Just wanted to correct myself: I meant that following operations are not atomic:
lastSourceValue = callback.getNextValue();
return make( lastSourceValue );
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Attachments: NoopOptimizerTest.java
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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8:02 a.m.
New subject: [Hibernate-JIRA] Updated: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Maciej Baranowski updated HHH-2928:
-----------------------------------
Attachment: NoopRaceConditionTest.java
Here is JUnit test doing actual database work - it simulates many inserts done by a few
threads.
The target database needs to be Oracle to observe the race condition.
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Attachments: NoopOptimizerTest.java, NoopRaceConditionTest.java
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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12:57 p.m.
New subject: [Hibernate-JIRA] Updated: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Maciej Baranowski updated HHH-2928:
-----------------------------------
Attachment: NoopOptimizerTest.java
Here is improved version of the NoopOptimizerTest (previous one was a little be
unstable..)
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Attachments: NoopOptimizerTest.java, NoopOptimizerTest.java,
NoopRaceConditionTest.java
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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1:06 p.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Maciej Baranowski commented on HHH-2928:
----------------------------------------
Here is a fixed version of NoopOptimizer generate() method. As you may notice the trick is
to use a local method variable. This is better then adding the synchronized clause for the
whole method - as this would cause scalability problems in the case when there is latency
on database connection.
public Serializable generate(AccessCallback callback) {
//copy the value to local variable to avoid race condition
long localLastSourceValue = lastSourceValue;
if (localLastSourceValue == -1) {
while (localLastSourceValue <= 0) {
localLastSourceValue = callback.getNextValue();
}
} else {
localLastSourceValue = callback.getNextValue();
}
lastSourceValue = localLastSourceValue;
return make(localLastSourceValue);
}
Sorry that it is not a formal patch but I am not sure what version of the OptimizerFactory
it should apply to
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3
Attachments: NoopOptimizerTest.java, NoopOptimizerTest.java,
NoopRaceConditionTest.java
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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5:29 p.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
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]
John S. Adair commented on HHH-2928:
------------------------------------
I notice the checked in fix synchronizes the two methods. We're on 3.2.5 and can't
take the newest drop yet, so I made the change and built hibernate locally to see if it
solved our problems. It did solve the duplicate key problems but led to an apparent
deadlock. I'm not filing a new ticket because I can't swear this isn't a
problem on our end and don't have a simple reproducible test case, but here are the
stack traces for what it's worth:
"pool-1-thread-8" prio=6 tid=0x0337a008 nid=0x1738 waiting for monitor entry
[0x04f1e000..0x04f1fc68]
at
org.hibernate.id.enhanced.OptimizerFactory$PooledOptimizer.generate(OptimizerFactory.java:172)
- waiting to lock <0x23d46dd0> (a
org.hibernate.id.enhanced.OptimizerFactory$PooledOptimizer)
at
org.hibernate.id.enhanced.SequenceStyleGenerator.generate(SequenceStyleGenerator.java:157)
at
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:99)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:218)
at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:269)
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:217)
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:170)
at org.hibernate.engine.Cascade.cascade(Cascade.java:131)
at
org.hibernate.event.def.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:431)
at
org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:265)
at
org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:495)
...
"pool-1-thread-7" prio=6 tid=0x02d8f008 nid=0x668 in Object.wait()
[0x04ede000..0x04edfce8]
at java.lang.Object.wait(Native Method)
- waiting on <0x23d34768> (a org.apache.commons.pool.impl.GenericObjectPool)
at java.lang.Object.wait(Object.java:474)
at
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:748)
- locked <0x23d34768> (a org.apache.commons.pool.impl.GenericObjectPool)
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
at
org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.jdbc.AbstractBatcher.openConnection(AbstractBatcher.java:558)
at
org.hibernate.engine.transaction.Isolater$JdbcDelegate.delegateWork(Isolater.java:178)
at org.hibernate.engine.transaction.Isolater.doIsolatedWork(Isolater.java:43)
at
org.hibernate.engine.TransactionHelper.doWorkInNewTransaction(TransactionHelper.java:51)
at org.hibernate.id.enhanced.TableStructure$1.getNextValue(TableStructure.java:72)
at
org.hibernate.id.enhanced.OptimizerFactory$PooledOptimizer.generate(OptimizerFactory.java:173)
- locked <0x23d46dd0> (a
org.hibernate.id.enhanced.OptimizerFactory$PooledOptimizer)
at
org.hibernate.id.enhanced.SequenceStyleGenerator.generate(SequenceStyleGenerator.java:157)
at
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:99)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:218)
at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:269)
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:217)
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:170)
at org.hibernate.engine.Cascade.cascade(Cascade.java:131)
at
org.hibernate.event.def.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:431)
at
org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:265)
at
org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:495)
...
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate3
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3.0.CR1
Attachments: NoopOptimizerTest.java, NoopOptimizerTest.java,
NoopRaceConditionTest.java
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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5:37 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2928) optimizers for enhanced id generators should be synchronized against multi-threaded access
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928?page=c...
]
Laszlo Sas commented on HHH-2928:
---------------------------------
Optimizers are not thread-safe. (Used version core 3.3.2)
NoopOptimizer:
1) public Serializable generate(AccessCallback callback) must be synchronized.
Fix: public synchronized Serializable generate(AccessCallback callback)
2) public long getLastSourceValue()
Fix: public synchronized long getLastSourceValue()
HiLoOptimizer:
1) public long getLastSourceValue()
Fix: public synchronized long getLastSourceValue()
2) public long getLastValue()
Fix: public synchronized long getLastValue()
3) public long getHiValue()
Fix: public synchronized long getHiValue()
PooledOptimizer:
1) public long getLastSourceValue()
Fix: public synchronized long getLastSourceValue()
2) public long getLastValue()
Fix: public synchronized long getLastValue()
Would you be so kind as to apply these modifications?
Thanks,
Laszlo
optimizers for enhanced id generators should be synchronized against
multi-threaded access
------------------------------------------------------------------------------------------
Key: HHH-2928
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2928
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.2.5
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.2.6, 3.3.0.CR1
Attachments: NoopOptimizerTest.java, NoopOptimizerTest.java,
NoopRaceConditionTest.java
Currently the optimizers do not serialize access to their internal state when applying
their optimizations. This only affects the pooled and hilo optimizers.
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12 comments
4 participants
participants (4)
-
John S. Adair (JIRA) -
Laszlo Sas (JIRA)
-
Maciej Baranowski (JIRA)
-
Steve Ebersole (JIRA)