Hi,
I've set up a configuration for EhCacheTicketRegistry with ticket
replication between two cas instances for fail over/load balancing.
Please not that you'll need to get the very last version of ehcache 1.2.1RC
which "add a cache bootstrap mechanism. This is used to populate a cache
when it is first initialized. An abstract factory,
BootstrapCacheLoaderFactory has been defined along with an interface
BootstrapCacheLoader. The initial concrete implementations are for RMI, so
that a new cache entering a cluster gets bootstrapped from a randomly chosen
peer."
Both asynchronous and synchronous replication passed the unit tests.
Under stress tests:
do while(true){log in, ask for a ST and validate it} on both instances,
some strange things happened:
-With asynchronous replication, the resulting caches are not the same, and
some tickets are never deleted. This means that a service ticket can be used
twice. I assume the same can occur with TGT with logout.
-With synchronous replication, both servers freeze after a couple of
seconds: a thread dump shows lots of locked threads.
I have tried:
-Both RMI/JNDI peer listeners
-Both manual and automatic peer discovery
-to add a couple of synchronized blocks in the EhCacheTicketRegistry
without any success...
I'm a little disappointed wondering if this is an Ehcache or CAS issue.
I've also write a JGroupsTicketRegistry implementation using the
DistributedHashTable which is currently deprecated.
This works under stress tests but with a significant performance lost
comparing to ehcache (about 4 times slower than ehcache), but I hadn't tuned
it.
I can provide the whole code and configuration if you are interested.
Hope this helps!
Best regards
Marc-Antoine Garrigue
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> Behalf Of Stephen A. Cochran
> Sent: mercredi 14 juin 2006 19:50
> To: Yale CAS mailing list
> Subject: Re: TicketRegistry and Load Balancing / Failover
>
>
> On Jun 14, 2006, at 1:38 PM, Scott Battaglia wrote:
>
> > I probably just moved it :-)
> >
> > Its here:
> > http://developer.ja-sig.org/source/viewrep/jasig/cas3/core/src/main/
> > java/org/jasig/cas/ticket/registry/EhCacheTicketRegistry.java?r=1.2
> >
> > I don't remember where I put the configuration file example
> > though. The
> > EhCache web site should have details on configuring the ehcache.xml
> > file
> > for distributed caches.
>
>
> Ok, I must have missed that one. I thought I looked at them all and
> kept finding deleted ones and a reference to a bug that said
> something didn't work ;)
>
> Will give it a try.
>
> Steve
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