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 12:45:45 -0700
Not really sure what the problem is here. I will attempt to set up some nodes here at the OSL over the next day or two and debug. What Web container/OS are you using?
Jason
On Wed, 2004-04-21 at 11:14, Enrique Medina wrote:
> Cache events are correct, but they are "local". I mean, when the first
> instance caches an object, it is supposed to inform the other instance,
> through JavaGroups, but this communication doesn't happen.
>
>
> >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 10:24:41 -0700
> >
> >The debug output will show the cache events being handled such as read
> >and gets from the cache.
> >
> >Jason
> >
> >On Wed, 2004-04-21 at 09:53, Enrique Medina wrote:
> > > What do you exactly want to log? What do you want me to show about the
> > > logging messages?
> > >
> > >
> > > >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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