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From Andrus Adamchik <and...@objectstyle.org>
Subject Re: Query Cache and DataDomain Snap Shot Cache
Date Wed, 23 Sep 2009 13:51:34 GMT
You are correct - flushing query cache groups across the cluster with  
JGroups (or something else) is a low overhead way to propagate  
updates. My usual setup is to have post-update/remove/persist  
listeners generate a distributed event with a cache group appropriate  
for the object being saved. This allows to define flush granularity at  
any level desired.

I don't have JGroups config specifically restricted to localhost,  
however I haven't seen any problems with network flooding with mine.  
Unless you also have some security considerations, you can use  
something like that:

UDP(mcast_addr=231.12.21.132;mcast_port=45569;ip_ttl=4;tos=0;mcast_send_buf_size=150000;mcast_recv_buf_size=80000;bind_port=20000;port_range=500):PING(timeout=2000;num_initial_members=3):MERGE2(min_interval=5000;max_interval=10000):FD_SOCK:VERIFY_SUSPECT(timeout=1500):pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800):UNICAST(timeout=300,600,1200,2400):pbcast.STABLE(desired_avg_gossip=20000):FRAG(frag_size=8096):pbcast.GMS(join_timeout=5000;shun=false;print_local_addr=true)

Andrus

On Sep 23, 2009, at 4:34 PM, Malcolm Edgar wrote:
> Hi All,
> I am looking to improve the performance of a set of web applications
> running. We have one application which is used mainly for
> adminsitration/configuration and a number of public facing web  
> applications
> which can have a high load.
>
> I have been experimenting with OSCache but the problem I see is that  
> the
> query cache and the object cache are not unified, so I sometimes have
> situations where the objects from the caches are not consistent.   
> While the
> query cache can timeout, the object cache doesn't, so if another web
> application makes an update the object cache in this application is  
> not
> updated.
>
> I presume the answer to this problem is using JGroups, if so does  
> anyone
> have a configuration where its constrained to localhost. I don't  
> really want
> to be broadcasting notification messages across the network.
>
> regards Malcolm Edgar


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