[jbosscache-dev] Re: JBoss Cache and Hibernate Integration

Mon Feb 26 11:45:40 EST 2007

Ok, so my notes from the call, based on issues from the wiki

1.  Multiple caches will probably only formally make it in the next  
major Hibernate release - 3.3.

2 Notes on putForExternalRead() functionality, in addition to the  
solution presented on the wiki:
- PFER only goes through if node does not exist; no-op otherwise
- Force asynchronous mode for replication or invalidation to prevent  
any blocking
- 0ms lock timeout to prevent any blocking here either.  If this  
fails, PFER is a no-op
- no to separate thread necessary, since we will be operating with a  
0ms timeout, async replication and a no-op if the node exists.  The  
only real chance of any blocking here is JGroups FC which is  
considered small enough a case.

3.  Since JBC 1.4.1.SP1, write locks are not acquired on parents when  
adding or removing children, to be more accurate to repeatable read  
semantics.  WLs can still be acquired on parents if enabled in the  
configuration (see "LockParentForChildInsertRemove" in http:// 
labs.jboss.com/file-access/default/members/jbosscache/freezone/docs/ 
1.4.1.SP2/TreeCache/en/html/configuration.html, which defaults to  
false).  As such, this contention should no longer be a problem.

4.  Brian implemented for EJB3 clustering in AS 4.2, will make it's  
way back into HIbernate in the 3.3 timeframe?

5.  Do nothing for now since the urgency is removed.  Only fails on  
old versions of JBoss TS.  In future (JBC 2.1 timeframe) look at what  
the microcontainer has to offer with synchronisation registrations.

6.  Coordination issue

7.  Galder to come back with more details here, but general consensus  
is not to perform transparent retries.

Feel free to add stuff I may have missed or further thoughts.  Very  
useful and productive call!

Cheers,
Manik

On 24 Feb 2007, at 01:06, Brian Stansberry wrote:

> OK, Monday 9/26 at 10:00 AM EST it is.  Details below.  Manik, you  
> had a problem today joining a conf Ram set up using the # below;  
> you guys overseas might test it during your Monday and if there's  
> an issue send me a note by 9:30 EST or so.
>
> Main things to discuss are on http://wiki.jboss.org/wiki/Wiki.jsp? 
> page=JBossCacheHibernateAlignment.
>
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> Manik Surtani wrote:
>> +1
>> On 22 Feb 2007, at 18:19, Steve Ebersole wrote:
>>> Brian Stansberry wrote:
>>>> Sent this out a while back, but the conf call didn't come off  
>>>> due to scheduling issues.  Time to try again.
>>>>
>>>> How does next Monday, Feb 26 at 10:00 AM EST sound?  Once we  
>>>> have an agreed time I'll send out conference call details.   
>>>> Those cc'ed on the mailing lists are welcome to join in.
>>>>
>>> Also including Owen explicitly, since I am not sure if he is part  
>>> of either list.
>>>
>>> That date/time is fine for me.
>> -- 
>> Manik Surtani
>> Lead, JBoss Cache
>> JBoss, a division of Red Hat
>> Email: manik at jboss.org
>> Telephone: +44 7786 702 706
>> MSN: manik at surtani.org
>> Yahoo/AIM/Skype: maniksurtani
>
>
> -- 
> Brian Stansberry
> Lead, AS Clustering
> JBoss, a division of Red Hat
> brian.stansberry at redhat.com
>

--
Manik Surtani

Lead, JBoss Cache
JBoss, a division of Red Hat

Email: manik at jboss.org
Telephone: +44 7786 702 706
MSN: manik at surtani.org
Yahoo/AIM/Skype: maniksurtani