From: Jason McKerr <[EMAIL PROTECTED]> Reply-To: "OJB Users List" <[EMAIL PROTECTED]> To: OJB Users List <[EMAIL PROTECTED]> Subject: Re: Clustered cache with OSCache & JavaGroups Date: Wed, 21 Apr 2004 08:20:56 -0700
Can you add the a line to your/a log4j properties files that lowers the debug level? It would look like:
log4j.category.com.opensymphony.oscache=DEBUG
On Wed, 2004-04-21 at 07:58, Enrique Medina wrote:
> Hi,
>
> I have developed a web application with OJB, as the ORM for data access. But
> now, I want to use OJB in a clustered environment. I have read with
> attention the information provided at the web:
>
> http://db.apache.org/ojb/howto-work-with-clustering.html
>
> with respect to setting up OSCache to work with OJB in a cluster. I have
> strictly followed all the steps commented in this tutorial, and have made a
> little client test application to see the results. Everything seems to start
> perfectly, but no cache communication exists between two instances of this
> client test application at all!
>
> I am using OJB RC6 with latest version of OSCache & JavaGroups deployed
> within OSCache distribution. I have a simple test application consisting of:
>
> 1 public static void main(String[] args)
> 2 {
> 3 // Obtain a connection through OJB broker.
> 4 PersistenceBroker broker =
> PersistenceBrokerFactory.defaultPersistenceBroker();
> 5
> 6 // Create a new query by example that should return all clients.
> 7 Query query = QueryFactory.newQueryByExample(new ClientVO());
> 8 Collection clients = broker.getCollectionByQuery(query);
> 9
> 10 // Ask again for the collection of clients.
> 11 Collection againClients = broker.getCollectionByQuery(query);
> 12 }
>
> I set a breakpoint on lines 8 and 11, just before obtaining the clients for
> the first time and for the second time.
>
> The sequence of steps I follow to see if two instances of the program
> communicate at cache level through JavaGroups are:
>
> 1) I run a first instance of this test application
> 1.1) The thread of execution gets stopped on line 4 (first instance).
> The JavaGroups logging says -- A new member at address '192.168.0.1:1590'
> has joined the cluster
>
> 2) Then I run a second instance of the application
> 2.1) The thread of execution gets stopped on line 4 (second instance). I
> see on the console how the first instance is notified that the second
> instance has joined the cluster (JavaGroups logging -- A new member at
> address '192.168.0.1:1593' has joined the cluster).
>
> 1.2) I obtain the collection of clients for the first time on first
> instance, so all the object are cached.
>
> 2.2) I obtain the collection of clients for the first time on second
> instance. But objects are not retrieved from the cache (which is supposed to
> be shared with the first instance); instead they are cached again (as if it
> was a local cache for the instance).
>
> 1.3) I obtain again the collection of clients for the second time on
> first instance. Now the objects are retrieved from the cache (but as a local
> cache only available to the first instance)
>
> 2.3) I obtain again the collection of clients for the second time on
> second instance. Now the objects are retrieved from the cache (but as a
> local cache only available to the second instance).
>
> So this is my simulation of a clustered environment with two instances of
> the same test application. And of course I don't get the behaviour I
> expected to.
>
> Am i doing something worng? And I missunderstanding something? Can this kind
> of test be done, as reflected on the documentation from OJB web?
>
> Patiently observing the console, it seems that on every instance a new
> JavaGroups broadcasting listener is created:
>
> INFO [main] (Config.java:146) - Properties
> {cache.algorithm=com.opensymphony.oscache.base.algorithm.LRUCache,
> cache.capacity=1000, cache.unlimited.disk=false,
> cache.event.listeners=com.opensymphony.oscache.plugins.clustersupport.JavaGroupsBroadcastingListener}
> INFO [main] (GeneralCacheAdministrator.java:98) - Constructed
> GeneralCacheAdministrator()
> INFO [main] (GeneralCacheAdministrator.java:293) - Creating new cache
> INFO [main] (AbstractBroadcastingListener.java:35) -
> AbstractBroadcastingListener registered
> INFO [main] (JavaGroupsBroadcastingListener.java:91) - Starting a new
> JavaGroups broadcasting listener with
> properties=UDP(mcast_addr=231.12.21.132;mcast_port=45566;ip_ttl=32;mcast_send_buf_size=150000;mcast_recv_buf_size=80000):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):pbcast.STABLE(desired_avg_gossip=20000):UNICAST(timeout=5000):FRAG(frag_size=8096;down_thread=false;up_thread=false):pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;shun=false;print_local_addr=true)
>
> -------------------------------------------------------
> GMS: address is 192.168.0.1:1590
> -------------------------------------------------------
> INFO [main] (JavaGroupsBroadcastingListener.java:99) - JavaGroups clustering
> support started successfully
> INFO [PullPushAdapterThread] (JavaGroupsBroadcastingListener.java:166) - A
> new member at address '192.168.0.1:1590' has joined the cluster
>
> so this can be maybe the problem ... But I confess I have no idea ...
>
> Thanks in advance,
> Enrique Medina.
>
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