[Building Sakai] distributed state replication in sakai 2.6

[John Bush]

nevermind, we are just going to route webdav to one tomcat until we  
get a fancier loadbalancer

On Dec 17, 2009, at 10:32 AM, John Bush wrote:

> If we need to do distributed state replication in sakai 2.6, what is
> the suggested way?  Is there an agreed upon way?  I know a
> messageservice exists in contrib, or hide under ehcache, or
> terracotta.  Is it just pick your own poison?  Seems like unicon has
> done the most work in this area that I'm aware of anyway.  Is this
> something the product council should make a recommendation on?
>
> The reason I'm asking is we've uncovered a rather nasty bug in webdav
> that is caused by the mac client in a cluster.  It brings down the
> server.  Its due to resource contention around locking.  I think its
> probably caused by how we are doing load balancing,  its not clear in
> our setup quite yet how to force webdav to be sticky, we are still
> looking into that.  If we pursue a state replication solution to
> replicate the locking state around the cluster, we'd like this work to
> make it into core, and would like some guidance on the appropriate way
> to do this for general adoption.
>
> We are still researching this issue, expect a JIRA with more detail
> later today.
>
> John
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