[jboss-dev-forums] [Design of EJB 3.0] - Re: Passivating EJB 3 Stateful Session Beans stops the World

[bstansberry@jboss.com]

Just an update.

First, I deployed a bean with configuration like what you reported Andy, and when StatefulTreeCache was accessing the bean metadata to determine how to set up JBoss Cache's passivation, it got a maxSize=100000.  So, that's all working fine.

I deployed the bean along with a little service that creates a configurable # of threads that loop a configurable number of times instantiating new beans. Doesn't use the beans after looking up the proxy and invoking a single getter. Fired it off telling it to use 4 threads to create 200K beans. Am now watching the JMX console view of the bean container to see what happens.

1) The CurrentSize attribute steadily rose past 10K; no apparent limit; eventually got up to over 24K

2) After 5 mins, consistent with the default @CacheConfig.idleTimeoutSeconds=300 in ejb3-interceptors-aop.xml, passivation kicked in and the CurrentSize started dropping a bit while PassivatedCount steadily rose. It would appear the single background thread is able to passivate beans faster than the 4 threads create them.

Judging from some periodic logging I added, it's taking about 6 secs to create 500 beans.  The beans aren't particularly heavyweight, the client is in-vm, and there's only one node in the cluster, so no replication going on. So not particularly fast.

But, the passivation part seems to be working as I'd expect.

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