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From <erlend.bjo...@aftenposten.no>
Subject Flushing of oscache in a cluster ?
Date Thu, 21 Sep 2006 15:07:41 GMT
Hi there!

 

Does anyone have experience with this ?

 

As far as I have understood it, if you have one application split into two wep apps (1. out
to web - 2. admin), 

using Ibatis DataMapper with caching using oscache, they both have their own cache and if
you have

 

    <cacheModel id="company-cache" type="OSCACHE">

        <flushInterval hours="1"/>

        <flushOnExecute statement="updateCompany"/>

    </cacheModel>

 

they don't flush each other cache when updateCompany is run (in this case flush the web cache
when a update in admin occur). 

 

So far so good (?) and here comes oscache clustering  mechanism into the picture ?

 

Have anyone been able to flush each other cache when you have two web apps like we have ?
What did you do ? :-)

 

--

 

Since the networks guys here don't like multicasting, I have been looking at JavaGroupsBroadcastingListener
with a 

GossipServer or GossipRouter. Anyone experience with that togheter with Ibatis ?

 

--

 

My oscache.properties:

cache.event.listeners=com.opensymphony.oscache.plugins.clustersupport.JavaGroupsBroadcastingListener

cache.cluster.properties=UDP(ip_mcast=false;mcast_addr=224.0.0.35;mcast_port=45566;ip_ttl=32;mcast_send_buf_size=150000;mcast_recv_buf_size=80000)

:PING(gossip_host=10.4.0.245;gossip_port=5555;gossip_refresh=15000;timeout=2000;num_initial_members=3)

 

First of all when I run the GossipServer, at once it found the first client, it's shout down.
Is that normal, trick to make it run further ? :-)

 

Then I tried the GossipRouter and the consol tells me that it finds the two apps/machines
it supposed to do. I'm running the GossipRouter on port 5555 on machine 10.4.0.245 which

also is one of the test clients. The other test machine is 10.4.1.8. 

 

--

 

Consol on the GossipRouter:

 

GossipRouter is starting...

GossipRouter started at Thu Sep 21 15:57:14 CEST 2006

Listening on port 5555 bound on address 0.0.0.0/0.0.0.0                  (Does this sound
good ?)

..

DEBUG ...org.jgroups.stack.GossipRouter (Line: 313) - router accepted connection from Socket[addr=/10.4.1.8,port=4463,localport=5555]

DEBUG ...org.jgroups.stack.GossipRouter (Line: 524) - gossip is REGISTER_REQ group=OSCacheBus,
mbr=10.4.1.8:4296

 

DEBUG ...org.jgroups.stack.GossipRouter (Line: 313) - router accepted connection from Socket[addr=/10.4.0.245,port=1310,localport=5555]

DEBUG ...org.jgroups.stack.GossipRouter (Line: 524) - gossip is REGISTER_REQ group=OSCacheBus,
mbr=10.4.0.245:1309

 

DEBUG ...org.jgroups.stack.GossipRouter (Line: 618) - running sweep

DEBUG ...org.jgroups.stack.GossipRouter (Line: 618) - running sweep

...

 

 

So far it's look good in my eyes, then I try to test to flush the cache in one app, I was
expecting the cache in the other app also get flushed. NOT !!!! :-)

 

I don't get any info in the GossipRouter consol, saying, got a flush command or something,
should I ? The cache get flushed on the machine that send

the flush of course, but does anyone have any clues of what I can do to make the flush clustering
mechanism  to work ? should I use JMS ? 

 

Links to OSCACHE clusterings documentation:

http://www.opensymphony.com/oscache/wiki/Clustering.html

 

How to not using multicasting:

http://www.jgroups.org/newuser/node66.html

 

http://www.jdocs.com/jgroups/2.2.6/api/org/jgroups/stack/GossipRouter.html

 

You have any useful links ?

 

--

 

So does anyone have any clues on what I should look at, do  ????? :-)

 

 

Thanks a lot !!!!

 

 

Best regards,

Erlend Bjørge


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