Hi,
I am trying to get a feel for how EJB/JNDI clustering will be implemented
in Geronimo and when it might be implemented.
I remember reading somewhere in the mail archives that the clustering
module in Geronimo has been abandoned and that ActiveCluster will be used.
There are various technologies and techniques which can be classified under the generic term 'clustering'. Its certainly not on Geronimo's agenda AFAIK to develop a replicated JNDI solution - though the Directory project at Apache is doing something like that - but I'd call that a replicated JNDI rather than a 'clustered' JNDI.
ActiveCluster is a simple & low level API to clusters of nodes and supports cluster-wide and point to point messaging abstractions. So its an ideal low level abstraction for builiding a model of which nodes are available and allocating work among a cluster, implementing master/slave or electing a leader, implementing a distributed lock manager etc. So its a fairly low level library that some distributed algorithm can use.
Is EJB/JNDI clustering planned to be supported in the Geronimo 1.0 release
or is this non-essential functionality that will be in a later release?
Not sure on that one :). I guess it'll be integrated when its ready.
Is the WADI project planning on providing EJB Tier clustering in addition
to Web Tier clustering?
Yes.
So WADI is a higher level protocol & framework for implementing web and EJB based clustering, fail-over, session migration etc. Its based on top of ActiveCluster.
James ------- http://radio.weblogs.com/0112098/
