[jboss-dev-forums] [Design the new POJO MicroContainer] - Re: Parallel deployments

[smarlow@redhat.com]

If we are worried about not having enough threads to start the server, couldn't we require that the pool be configured with enough threads to boot the server?  This could be via a comment in the xml file.

A related concern is how we will deal with several deployment threads trying to synchronize on the same object locks.  I assume this is were additional tuning will come into play (reducing object lock contention through code modifications).  One possible solution, is that we could manually designate which thread (e.g.  "cluster partition init") is to be used on a per component basis.  Before diving into solving this potential issue, we need to evaluate how expensive object lock contention will be (to avoid premature optimizing).  But, it doesn't hurt to consider that we might need to do something in this area.  If we were to asynchronously deploy in named threads, that might require a separate thread pool.

Another concern is redeployment in a production app server deployment.  We need to be clear in the thread pool xml file (via comments) as to what JBoss elements use the system thread pools (there is a long running task pool and short running task pool).  If a customer sizes the pools only on the application needs, then redeployment on a loaded system could run short of threads needed to redeploy.  Even if the pool is increased to accommodate the number of threads needed for deployment, applications can easily consume those as well in a loaded system.  I'm wondering if we need to introduce throttling between the users of the system thread pool, as a way to carve up the thread pool between different types of tasks.  Logically, this would create sub-pools of threads, where perhaps there could be borrowing of the threads between sub-pools.  I'm not sure if this is over-engineering, what could possibly be handled via configuration and operational considerations (only hot-deploy during idle time).



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