Using JBoss 3.2.3, I have set up a 2 node cluster with a SFSB farmed across them. I
want to avoid state replication across the nodes, and have implemented the
isModified() method in the bean to always return false. On executing, I notice the
following:
a. As part of invoking homeRef.create() on a remote client, setSessionContext() and
ejbCreateXXX() get invoked on node N1 followed by ejbPassivate() and ejbActivate() on
the same node N1.
b. After this, a remoteRef.businessMethod() invocation results in the following
method sequence on the OTHER node N2:
setSessionContext()
ejbActivate()
businessMethod()
isModified()
Interestingly, my businessMethod() goes through fine. I expected that it would fail
since it needs state information that I populate in ejbCreateXXX() and since there is
no replication, this state should not be available locally on N2.
What I notice is that there is an implicit state replication that happens before JBoss
invokes businessMethod(). So, although I have specified that I do not want
replication, replication happens at least once and that is before the invocation of
the first business method.
Other important findings:
------------------------------
a. All subsequent business method invocations on the remote interface stick to the
same node. Which is good.
b. The splitting of ejbCreate() and businessMethod() invocations across N1 and N2
happens from time to time. Sometimes, all invocations go to one node only and no
splitting happens.
c. Removing isModified() DOES NOT affect any of the above behavior.
WHY THIS IS A PROBLEM:
--------------------------------
The state held in my SFSB cannot travel on the wire. This is some legacy I am working
with and can't be changed at this point. So, the implicit one-time replication of
state, that too once in a while, is not acceptable to my application.
Moreover, isModified() being bypassed after ejbCreateXXX() invocations seems like a
hack to me, thereby mandating the implicit replication step, even if it is one-time.
My deadline is very very close and any help in this regard is deeply appreciated!!
Best Regards,
Surajit
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