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List:       jboss-user
Subject:    Re: [JBoss-user] CMR Error under load
From:       "Simone Milani" <milasx () hotmail ! com>
Date:       2003-03-31 16:54:18
[Download RAW message or body]

Hi Andrew,

    I am trying your test, do you have a script to populate the tables and
the parameters for the CMRTestClass?

Thanks

Simone
----- Original Message -----
From: "Andrew May" <amay@ingenta.com>
To: <jboss-user@lists.sourceforge.net>
Sent: Monday, March 31, 2003 2:46 PM
Subject: Re: [JBoss-user] CMR Error under load


> I don't see a RC5 release on sourceforge, so I assume this means I have to
build it from
> CVS. I'll give that a go, but as I've never tried it before it could take
me a while
> (never actually used CVS I confess) - still it's something I ought to be
able to do.
>
> If anyone has a chance to run my test on this version of JBoss I'd be
grateful - it'll
> probably be at least a day before I get that far.
>
> Andrew
>
> Alex Loubyansky wrote:
>
> > Could you, please, try it on JBoss-3.2.0RC5 which is the current
> > version.
> > I have a testcase that failed in my old 3.2 and passes in current
> > 3.2.0RC5.
> >
> > Please, try it.
> >
> > alex
> >
> > Monday, March 31, 2003, 12:37:32 PM, Andrew May wrote:
> >
> > AM> OK, here's a test case that recreates the problem for me.
> >
> > AM> I've attached test.jar which is the ejb-jar and also includes the
test case class. Also
> > AM> attached is test-src.jar which has the source code for the EJBs and
the test. I'm afraid
> > AM> I've been hacking around existing build scripts to create the test
so I've not included
> > AM> any way of building the code. I'm using an older version of XDoclet.
> >
> > AM> There are 2 entities, Parent and Child. The CMRTest class creates
multiple threads to call
> > AM> the getPropertyMap() method on the Parent. This method iterates
around the CMR collection
> > AM> of children, and when multiple threads are run causes occasional CMR
errors.
> >
> > AM> In jbosscmp-jdbc.xml the datasource is java:/jdbc.testPool and the
mapping is for Oracle8.
> > AM> My test doesn't create the test data, so I've manually inserted data
before running the
> > AM> test. I've found that it's only necessary to have one child record
to recreate the problem.
> >
> > AM> The CMRTest class takes 3 arguments - the parent primary key, number
of threads, number of
> > AM> loops per thread. e.g.:
> >
> > AM> java com.ingenta.acs.test.ejb.CMRTest test1 30 100
> >
> > AM> 30 threads with 100 loops always causes at least one CMR error for
me. I've tested on two
> > AM> setups, both of which cause errors.
> >
> > AM> 1) Solaris, Sun JDK1.3.1, JBoss 3.2.0RC3, Oracle 8.1.7.2.0
> > AM> 2) Linux (Mandrake 9), Sun JDK1.4.1, JBoss 3.2.0RC4, Oracle
8.1.7.2.0
> >
> > AM> jboss.xml in the ejb-jar declares all get* methods to be read-only.
If I remove this the
> > AM> CMR error does not occur, but the test goes a lot slower.
> >
> > AM> Let me know if there's any more information you need.
> >
> > AM> Andrew
> >
> > AM> Dain Sundstrom wrote:
> >
> >
> >>>I fixed a similar bug in this stuff for Sacha on March 19th (version
> >>>1.43.2.13).  The problem was registering for transaction
synchronization
> >>>on the transaction in the context and not the transaction associated
> >>>with the current thread.  This bug created the type of problem you have
> >>>described, but the fix should bin in 3.2 rc4.
> >>>
> >>>Until someone can create a test case that reproduces the new bug, I
> >>>don't think there is much we can do.
> >>>
> >>>-dain
> >>>
> >>>On Friday, March 28, 2003, at 10:01 AM, Alex Loubyansky wrote:
> >>>
> >>>
> >>>>Hello Andrew,
> >>>>
> >>>>you are not alone complaining about this. But nobody could produce a
> >>>>testcase that fail at least eventually.
> >>>>
> >>>>I am trying to reproduce it but can't for the moment.
> >>>>
> >>>>I have a Parent and 1000 of related Child entities.
> >>>>I have 100 concurrent threads finding parent by primary key, getting
> >>>>children and iterating through relation collection.
> >>>>I use standard container for both Parent and Child.
> >>>>In jboss.xml get methods are read-only for both Parent and Child.
> >>>>
> >>>>Any more info you can provide? Again a testcase would be great. Let it
> >>>>fail not each time but eventually.
> >>>>
> >>>>Thank you,
> >>>>alex
> >
> >
> >
> >
> >
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