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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