You're both talking of pooling at different levels.
Cédric talks about pooling inside Jackrabbit of the jdbc connection
it maintains to its underlying database. This is Jackrabbit's
internal sauce, and its responsibility.
Bogdan talks about pooling JCR session at the Nuxeo level.
Actually I doubt this latter pooling is needed. One needs pooling when:
- creating a new session is expensive -- but it's not for Jackrabbit,
- reusing an old session gives the benefit of reusing caches -- but
the caches in Jackrabbit are still maximally shared by all sessions
when possible anyway, there are internal Jackrabbit datastructures
for that (see SharedItemStateManager).
So unless someone proves to me that session pooling is needed, I'm
not going to lose sleep over this :)
Florent
On 8 Jun 2007, at 17:49, Cédric Joyau wrote:
JackRabbit doesn't handle pooling at its level, at least not the
SimpleDbPersistenceManager. Discussion takes place over here :
http://www.mail-archive.com/[EMAIL PROTECTED]/
msg04431.html
I'm not an expert, but do you think it's possible to use an
existing pooling system and make it work with JackRabbit in Nuxeo ?
(reusing the JBoss one for instance, or using the commons-dbcp
package from the jakarta project). I'll have a deeper look into
this next week.
> Any volunteer to test if pooling on jackrabbit session is
improving perfs.? :)
Well, I am :)
Cedric
On 6/8/07, Bogdan Stefanescu <[EMAIL PROTECTED] > wrote:
Connections are handled by JBoss JCA implementation.
Nuxeo provides a resource adapter for the underlying repository
(jackrabbit) that is registered in JBoss.
Then jboss is using a pool of managed connection and also ensure the
repository resource is enlisted on the current transaction.
In fact if I remember well physical connections to jackrabbit
(jackrabbit sessions) are closed when a managed connection
is reused from the pool. So practically there is a JCR session per
request which is closed after the request ends.
So at nuxeo core level we don't use pooling.
I am not sure if Jackrabbit do some pooling at its level. But I
think it
should optimize connections to underlying
databases (or other storages)
Any volunteer to test if pooling on jackrabbit session is improving
perfs.? :)
Bogdan
Cédric Joyau wrote:
> Hi,
>
> I'd like to know how Nuxeo handles connections to datasources and
the
> content repository ... is it a single connection for each one or
it is
> possible to set up a connection pool ? Do you plan to do some
> performance tracking on this ?
>
> Cheers,
> Cédric
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Florent Guillaume, Director of R&D, Nuxeo
Open Source Enterprise Content Management (ECM)
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