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From Malcolm Edgar <>
Subject Re: Query Cache and DataDomain Snap Shot Cache
Date Wed, 23 Sep 2009 20:37:11 GMT
Thanks for that information I will give it ago.  Do you have an example of a
listener which performs a flush.  This is really what I am after, as there
are a relatively small tables which need to be synched, others don't need to
regards Malcolm Edgar

On Wed, Sep 23, 2009 at 11:51 PM, Andrus Adamchik <>wrote:

> 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=;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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