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: [EMAIL PROTECTED]
Telephone: +44 7786 702 706
MSN: [EMAIL PROTECTED]
Yahoo/AIM/Skype: maniksurtani
--
Brian Stansberry
Lead, AS Clustering
JBoss, a division of Red Hat
[EMAIL PROTECTED]
--
Manik Surtani
Lead, JBoss Cache
JBoss, a division of Red Hat
Email: [EMAIL PROTECTED]
Telephone: +44 7786 702 706
MSN: [EMAIL PROTECTED]
Yahoo/AIM/Skype: maniksurtani
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